Tootfinder

FOSDEM 24: Wie das CERN mit Petabyte jongliert
Experimente am CERN liefern eine Unmenge Daten. Zwei Admins zeigen zur FOSDEM24, wie die Storage-Systeme damit fertig werden.
https://www.heise.de/news/FOSDEM-24-…

Even CERN has to queue for GPUs. Here's how they optimise what they have.
'There's a tendency to say that all ML workloads need a GPU, but for inference you probably don't need them' (free reg)
https://www.computing.co.uk/interview/4197

Even CERN has to queue for GPUs. Here's how they optimise what they have
CERN, the European Organisation for Nuclear Research, has long had some of the biggest of big data needs. Its engineers historically built their own IT systems including for distributed and high performing computing (HPC), and sometimes still do. But the culture has largely shifted to engaging with open source communities with similar requirements, including adopting OpenStack for the computing needs of the Large Hadron Collider.

On this day in 2018 I got to see a NeXTcube from CERN that was a server or something...
#www

This is really nice: I can finally share the news that the #OAPEN Library and #DOAB will be hosted by #CERN
"An expanded collaboration agreement between CERN and the OAPEN Foundation sees the Laborat…

$K_S^0$ meson production in inelastic p p interactions at 31, 40 and 80 GeV/c beam momentum measured by NA61/SHINE at the CERN SPS
N. Abgrall, H. Adhikary, P. Adrich, K. K. Allison, N. Amin, E. V. Andronov, T. Anti\v{c}i\'c, I. -C. Arsene, M. Bajda, Y. Balkova, M. Baszczyk, D. Battaglia, A. Bazgir, S. Bhosale, M. Bielewicz, A. Blondel, M. Bogomilov, Y. Bondar, N. Bostan, A. Brandin, A. Bravar, W. Brylinski, J. Brzychczyk, M. Buryakov, A. F. Camino, M. \'Cirkovi\'c, M. Csana…

$K_S^0$ meson production in inelastic p+p interactions at 31, 40 and 80 GeV/c beam momentum measured by NA61/SHINE at the CERN SPS
Measurements of $K_S^0$ meson production via its $π^{+} π^{-}$ decay mode in inelastic $\textit{p+p}$ interactions at incident projectile momenta of 31, 40 and 80 GeV/$c$ ($\sqrt{s_{NN}}=7.7, 8.8$ and $12.3$ GeV, respectively) are presented. The data were recorded by the NA61/SHINE spectrometer at the CERN Super Proton Synchrotron. Double-differential distributions were obtained in transverse momentum and rapidity. The mean multiplicities of $K_S^0$ mesons were determined to be $(5.95 \pm 0.1…

Moore's law at work! In twenty years, Hadron Colliders have been reduced by a factor of over 1000! Exponentials FTW!
#MooresLaw #LHC #SHC

Have you registered for the GÉANT Special Interest Group on #Cloud #Interoperable #Software #Stacks (SIG-CISS) m…

SIG-CISS to meet on 13 March at CERN! – Register now | GÉANT CONNECT Online
The next meeting for the GÉANT Special Interest Group on Cloud Interoperable Software Stacks, the SIG-CISS, will meet on 13 March, 2024 at CERN, Geneva. It will be co-located with the CS3 Conference at CERN which will take place on 11-13 March, 2024. The 13th SIG-CISS meeting will focus on tackling challenges in the domain of cloud

💧 ProtoDUNE's argon filling underway, a significant step toward next era of neutrino research
https://phys.org/news/2024-04-protodune-argon-underway-significant-era.html

ProtoDUNE's argon filling underway, a significant step toward next era of neutrino research
CERN's Neutrino Platform houses a prototype of the Deep Underground Neutrino Experiment (DUNE) known as ProtoDUNE, which is designed to test and validate the technologies that will be applied to the construction of the DUNE experiment in the United States.

I've have been very proud to have been invited to do the keynote at the SANER conference in 2021 - even if it was initially planned in Hawai 🏄‍♂️☀️🏖️🕶️🍸 and it got moved online 📺 because of Covid.
Tomorrow, I'm equally proud to do a talk at CERN.
For somebody with no degree in computer science, it makes me feel very warm inside 💗

Nobel prizewinning theoretical physicist #Peter #Higgs has died aged 94.
He proposed the particle that gives other particles mass – now named the Higgs #boson and discovered by the Large Hadron Collider at CERN in 2012

Peter Higgs: Physicist who theorised the Higgs boson has died aged 94
Nobel prizewinning theoretical physicist Peter Higgs has died aged 94. He proposed the particle that gives other particles mass – now named the Higgs boson and discovered by the Large Hadron Collider at CERN in 2012

Search for long-lived heavy neutral leptons decaying in the CMS muon detectors in proton-proton collisions at $\sqrt{s}$ = 13 TeV
CMS Collaboration
https://arxiv.org/abs/2402.18658

Search for long-lived heavy neutral leptons decaying in the CMS muon detectors in proton-proton collisions at $\sqrt{s}$ = 13 TeV
A search for heavy neutral leptons (HNLs) decaying in the CMS muon system is presented. A data sample is used corresponding to an integrated luminosity of 138 fb$^{-1}$ of proton-proton collisions at $\sqrt{s}$ = 13 TeV, recorded at the CERN LHC in 2016-2018. Decay products of long-lived HNLs could interact with the shielding materials in the CMS muon system and create hadronic and electromagnetic showers detected in the muon chambers. This distinctive signature provides a unique handle to sear…

Did you know? 🎙️🦤 The second web browser in history, and apparently the first one designed to be multiplatform, was coded by Nicola Pellow – a crucial step in making the web accessible to a wider audience at the time, and having a lasting impact on the development of the WWW #nowebwithoutwomen #webhistory

No Web Without Women
An educational website featuring a collection of innovations by women in the fields of computer science and technology.

CERNs neuer Roboterhund spürt Strahlungslecks auf
Das CERN entwickelt einen Roboterhund, der sich in den chaotischen Experimentierkavernen bewegen und etwa Strahlungslecks aufspüren kann.
https://www.heis…

Beam test of n-type Silicon pad array detector at PS CERN
Sawan, M. Bregant, J. L. Bouly, O. Bourrion, A. van den Brink, T. Chujo, C. Krug, L. Kumar, V. K. S. Kashyap, A. Ghimouz, M. Inaba, T. Isidori, C. Loizides, B. Mohanty, M. M. Mondal, N. Minafra, N. Novitzky, N. Ponchant, M. Rauch, K. P. Sharma, R. Singh, D. Thienpont, D. Tourres, G. Tambave
ht…

Beam test of n-type Silicon pad array detector at PS CERN
This work reports the testing of a Forward Calorimeter (FoCal) prototype based on an n-type Si pad array detector at the CERN PS accelerator. The FoCal is a proposed upgrade in the ALICE detector operating within the pseudorapidity range of 3.2 < $\mathrmη$ < 5.8. It aims to measure direct photons, neutral hadrons, vector mesons, and jets for the study of gluon saturation effects in the unexplored region of low momentum fraction x ($\mathrm{\sim10^{-5} - 10^{-6}}$). The prototype is a $\mathrm…

Will we ever find out what they did during the eclipse in CERN ?
Did they open a portal?

Measurement of the production cross section of a Higgs boson with large transverse momentum in its decays to a pair of $\tau$ leptons in proton-proton collisions at $\sqrt{s}$ = 13 TeV
CMS Collaboration
https://arxiv.org/abs/2403.20201

Measurement of the production cross section of a Higgs boson with large transverse momentum in its decays to a pair of $τ$ leptons in proton-proton collisions at $\sqrt{s}$ = 13 TeV
A measurement of the production cross section of a Higgs boson with transverse momentum greater than 250 GeV is presented where the Higgs boson decays to a pair of $τ$ leptons. It is based on proton-proton collision data collected by the CMS experiment at the CERN LHC at a center-of-mass energy of 13 TeV. The data sample corresponds to an integrated luminosity of 138 fb$^{-1}$. Because of the large transverse momentum of the Higgs boson the $τ$ leptons from its decays are boosted and produced…

This https://arxiv.org/abs/2308.15151 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hepp…

$J/ψ$ and $ψ$(2S) polarization in proton-proton collisions at energies available at the CERN Large Hadron Collider using PYTHIA8
The production mechanisms of charmonium states in both hadronic and heavy-ion collisions hold great significance for investigating the hot and dense QCD matter. Studying charmonium polarization in ultra-relativistic collisions can also provide insights into the underlying production mechanisms. With this motivation, we explore the $J/ψ$ and $ψ$(2S) polarization in proton+proton collisions at $\sqrt{s}$ = 7, 8, and 13 TeV using a pQCD-inspired Monte-Carlo event generator called PYTHIA8. This w…

Back home after my talk #cern. Around 40 people came and listened how to evolve your APIs with #ApacheAPISIX.
Then I had a private tour of the computing center and the Antiproton Accelerator 🔬
Not bad for a Thursday 😊

Search for ZZ and ZH production in the $\mathrm{b\bar{b}b\bar{b}}$ final state using proton-proton collisions at $\sqrt{s}$ = 13 TeV
CMS Collaboration
https://arxiv.org/abs/2403.20241

Search for ZZ and ZH production in the $\mathrm{b\bar{b}b\bar{b}}$ final state using proton-proton collisions at $\sqrt{s}$ = 13 TeV
A search for ZZ and ZH production in the $\mathrm{b\bar{b}b\bar{b}}$ final state is presented, where H is the standard model (SM) Higgs boson. The search uses an event sample of proton-proton collisions corresponding to an integrated luminosity of 133 fb$^{-1}$ collected at a center-of-mass energy of 13 TeV with the CMS detector at the CERN LHC. The analysis introduces several novel techniques for deriving and validating a multi-dimensional background model based on control samples in data. A m…

Ein Leben für Physik und Forschung: Herwig Schopper, 100 Jahre
#CERN #DESY #Genf #Hamburg

Der Hundertjährige, der sich aufmachte, mit der Wissenschaft Frieden zu stiften
Herwig Schopper gilt als Grossvater des Cern in Genf. Wir haben ihn kurz vor seinem 100. Geburtstag zu Hause besucht.

... and the internet returned to normal. And there was much rejoicing. `yaay`
Does... anyone else see... any drawbacks to having so much of the internet's critical infrastructure in the control of and gatekept by so few tech conglomerates?
I don't think this is what the DARPA, CERN, W3C etc. folks had in mind.

Searches for exclusive Higgs boson decays into $D^*\gamma$ and $Z$ boson decays into $D^0\gamma$ and $K^0_s\gamma$ in $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector
ATLAS Collaboration
https://arxiv.org/abs/2402.18731

Searches for exclusive Higgs boson decays into $D^*γ$ and $Z$ boson decays into $D^0γ$ and $K^0_sγ$ in $pp$ collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector
Searches for the exclusive decays of the Higgs boson into $D^*γ$ and of the $Z$ boson into $D^0γ$ and $K^0_sγ$ can probe flavour-violating Higgs and $Z$ boson couplings to light quarks. Searches for these decays are performed with a $pp$ collision data sample corresponding to an integrated luminosity of $136.3$ fb$^{-1}$ collected at $\sqrt{s}=13$ TeV between 2016-2018 with the ATLAS detector at the CERN Large Hadron Collider. In the $D^*γ$ and $D^0γ$ channels, the observed (expected) 95$\…

On 8-9 April 2024 the Special Interest Group on Next Generation #Networks (SIG-NGN) workshop will take place at INFN in Catania, Sicily. In collaboration with #LHCONE, topics will include network #architecture

14th SIG-NGN Meeting - INFN Catania IT (Hybrid meeting)
SIG-NGN will be holding its 14th meeting as a in person workshop on Monday, 8-9 April 2024.  The meeting will be hosted jointly with the LHCONE meeting in Catania, Sicilly (https://indico.cern.ch/event/1349135/).Mark your calendar for the 14th SIG-NGN meeting - Catania, 8-9 April 2024Following a fruitful co-location of meetings in Prague in April 2023, SIG-NGN and the LHC networking group will once again co-locate face-to-face meetings this coming spring. This time we are adding networking...

Capacitive coupling study of the HERD SCD prototype: preliminary results
Ruo-Si Lu, Rui Qiao, Ke Gong, Wen-Xi Peng, Wei-Shuai Zhang, Dong-Ya Guo, Jia-Ju Wei, Yi-Ming Hu, Jian-Hua Guo, Qi Wu, Peng Hu, Xuan Liu, Bing Lu, Yi-Rong Zhang
https://arxiv.org/abs/2402.17271

Capacitive coupling study of the HERD SCD prototype: preliminary results
The Silicon Charge Detector (SCD) is a subdetector of the High Energy Cosmic Radiation Detection payload. The dynamic range of the silicon microstrip detector can be extended by the capacitive coupling effect, which is related to the interstrip capacitance and the coupling capacitance. A detector prototype with several sets of parameters was designed and tested in the ion beams at the CERN Super Proton Synchrotron. The capacitive coupling fractions with readout strip and floating strip incidenc…

This https://arxiv.org/abs/2308.16683 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_nuc…

Measurements of $π^\pm$, $K^\pm$, $p$ and $\bar{p}$ spectra in $^{40}$Ar+$^{45}$Sc collisions at 13$A$ to 150$A$ GeV/$c$
The NA61/SHINE experiment at the CERN Super Proton Synchrotron studies the onset of deconfinement in strongly interacting matter through a beam energy scan of particle production in collisions of nuclei of varied sizes. This paper presents results on inclusive double-differential spectra, transverse momentum and rapidity distributions and mean multiplicities of $π^\pm$, $K^\pm$, $p$ and $\bar{p}$ produced in $^{40}$Ar+$^{45}$Sc collisions at beam momenta of 13$A$, 19$A$, 30$A$, 40$A$, 75$A$ an…

As soon as the Cern portal has opened i will update here.
I hope i can take a picture of Obama …. upsie… i mean Satan, when he appears.

Search for the Z boson decay to $\tau\tau\mu\mu$ in proton-proton collisions at $\sqrt{s}$ = 13 TeV
CMS Collaboration
https://arxiv.org/abs/2404.18298 http…

Search for the Z boson decay to $ττμμ$ in proton-proton collisions at $\sqrt{s}$ = 13 TeV
The first search for the Z boson decay to $ττμμ$ at the CERN LHC is presented, based on data collected by the CMS experiment at the LHC in proton-proton collisions at a center-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 138 fb$^{-1}$. The data are compatible with the predicted background. For the first time, an upper limit at the 95% confidence level of 6.9 times the standard model expectation is placed on the ratio of the Z $\to$ $ττμμ$ to Z $\to$ 4$μ$ br…

This https://arxiv.org/abs/2309.03870 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hepp…

Anomalies in Particle Physics
The currently accepted mathematical description of the fundamental constituents and interactions of matter is the Standard Model of particle physics. Its last missing particle, the famous Higgs boson, was observed at the Large Hadron Collider at CERN in 2012. However, it is clear that the Standard Model cannot be the ultimate theory of Nature, and e.g. cannot account for Dark Matter or non-vanishing neutrino masses (and does not include gravity). In fact, searches for physics beyond the SM have…

This https://arxiv.org/abs/2309.16823 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hepe…

Search for supersymmetry in final states with disappearing tracks in proton-proton collisions at $\sqrt{s}$ = 13 TeV
A search is presented for charged, long-lived supersymmetric particles in final states with one or more disappearing tracks. The search is based on data from proton-proton collisions at a center-of-mass energy of 13 TeV collected with the CMS detector at the CERN LHC between 2016 and 2018, corresponding to an integrated luminosity of 137 fb$^{-1}$. The search is performed over final states characterized by varying numbers of jets, b-tagged jets, electrons, and muons. The length of signal-candid…

Portable acceleration of CMS computing workflows with coprocessors as a service
CMS Collaboration
https://arxiv.org/abs/2402.15366 https://

Portable acceleration of CMS computing workflows with coprocessors as a service
Computing demands for large scientific experiments, such as the CMS experiment at the CERN LHC, will increase dramatically in the next decades. To complement the future performance increases of software running on central processing units (CPUs), explorations of coprocessor usage in data processing hold great potential and interest. Coprocessors are a class of computer processors that supplement CPUs, often improving the execution of certain functions due to architectural design choices. We exp…

A Science4Peace initiative: Alleviating the consequences of sanctions in international scientific cooperation
A. Ali, M. Barone, S. Brentjes, D. Britzger, M. Dittmar, T. Ekel\"of, J. Ellis, S. Fonseca de Souza, A. Glazov, A. V. Gritsan, R. Hoffmann, H. Jung, M. Klein, V. Klyukhin, V. Korbel, P. Kokkas, P. Kostka, U. Langenegger, J. List, N. Raicevic, A. Rostovtsev, A. Sabio Vera, M. Spiro, G. Tonelli, P. van Mechelen, J. Vigen

A Science4Peace initiative: Alleviating the consequences of sanctions in international scientific cooperation
The armed invasion of Ukraine by the Russian Federation has adversely affected the relations between Russia and Western countries. Among other aspects, it has put scientific cooperation and collaboration into question and changed the scientific landscape significantly. Cooperation between some Western institutions and their Russian and Belarusian partners were put on hold after February 24, 2022. The CERN Council decided at its meeting in December 2023 to terminate cooperation agreements with R…

Status of the Top Plate and Anticryostat for High Field Cable Test Facility at Fermilab
V. Nikolic, G. Velev, R. Bruce, T. Tope, D. Orris, X. Yuan, M. Kifarkis
https://arxiv.org/abs/2403.13158

Status of the Top Plate and Anticryostat for High Field Cable Test Facility at Fermilab
Fermi National Accelerator Laboratory (Fermilab) is currently constructing a new High Field Vertical Magnet Test Facility (HFVMTF) designed for testing High Temperature Superconducting (HTS) cables under high magnetic fields. This facility is expected to offer capabilities similar to those of EDIPO at PSI and FRESCA2 at CERN. The background magnetic field of 15 T will be generated by a magnet supplied by Lawrence Berkeley National Laboratory. The primary function of HFVMTF will be to serve as a…

NA61/SHINE overview
P. Podlaski
https://arxiv.org/abs/2402.10973 https://arxiv.org/pdf/2402.10973

NA61/SHINE overview
NA61/SHINE is a multipurpose fixed-target experiment at the CERN Super Proton Synchrotron. The main goals of the NA61/SHINE strong interaction program are to discover the critical point of strongly interacting matter as well as to study the properties of produced particles relevant for the study of the onset of deconfinement -- the transition between the state of hadronic matter and the quark-gluon plasma. An analysis of hadron production properties is performed in proton-proton, proton-nucleus…

RootInteractive tool for multidimensional statistical analysis, machine learning and analytical model validation
Marian Invanov, Marian Ivanov jr, Giulion Eulise
https://arxiv.org/abs/2403.19330

RootInteractive tool for multidimensional statistical analysis, machine learning and analytical model validation
The ALICE experiment at CERN LHC is specifically designed for investigating heavy ion collisions. The upgraded ALICE accommodates a tenfold increase in PbPb luminosity and a two-order of magnitude surge in minimum bias events. To address the challenges of high detector occupancy and event pile-ups, advanced multidimensional data analysis techniques, including machine learning (ML), are indispensable. Despite ML popularity, the complexity of its models presents interpretation challenges, and ove…

Performance of the CMS electromagnetic calorimeter in pp collisions at $\sqrt{s}$ = 13 TeV
CMS Collaboration
https://arxiv.org/abs/2403.15518 https://

Performance of the CMS electromagnetic calorimeter in pp collisions at $\sqrt{s}$ = 13 TeV
The operation and performance of the Compact Muon Solenoid (CMS) electromagnetic calorimeter (ECAL) are presented, based on data collected in pp collisions at $\sqrt{s}$ = 13 TeV at the CERN LHC, in the years from 2015 to 2018 (LHC Run 2), corresponding to an integrated luminosity of 151 fb$^{-1}$. The CMS ECAL is a scintillating lead-tungstate crystal calorimeter, with a silicon strip preshower detector in the forward region that provides precise measurements of the energy and the time-of-arri…

Performance of the CMS electromagnetic calorimeter in pp collisions at $\sqrt{s}$ = 13 TeV
CMS Collaboration
https://arxiv.org/abs/2403.15518 https://

Performance of the CMS electromagnetic calorimeter in pp collisions at $\sqrt{s}$ = 13 TeV
The operation and performance of the Compact Muon Solenoid (CMS) electromagnetic calorimeter (ECAL) are presented, based on data collected in pp collisions at $\sqrt{s}$ = 13 TeV at the CERN LHC, in the years from 2015 to 2018 (LHC Run 2), corresponding to an integrated luminosity of 151 fb$^{-1}$. The CMS ECAL is a scintillating lead-tungstate crystal calorimeter, with a silicon strip preshower detector in the forward region that provides precise measurements of the energy and the time-of-arri…

The $v^{1/3}_{3}/v^{1/2}_{2}$ ratio in PbAu collisions at $\sqrt{s_{\mathrm{NN}}} = $ 17.3 GeV
D. Adamov\'a, G. Agakishiev, A. Andronic, D. Anto\'nczyk, H. Appelsh\"auser, V. Belaga, J. Biel\v{c}\'ikov\'a, P. Braun-Munzinger, O. Busch, A. Cherlin, S. Damjanovi\'c, T. Dietel, L. Dietrich, A. Drees, W. Dubitzky, S. I. Esumi, K. Filimonov, K. Fomenko, Z. Fraenkel, C. Garabatos, P. Gl\"assel, G. Hering, J. Holeczek, M. Kalisky, G. Krobath, V. Kushpil, A. Maas,…

The $v^{1/3}_{3}/v^{1/2}_{2}$ ratio in PbAu collisions at $\sqrt{s_{\mathrm{NN}}} = $ 17.3 GeV
The Fourier harmonics, $v_2$ and $v_3$ of negative pions are measured at center-of-mass energy per nucleon pair of $\sqrt{s_{\mathrm{NN}}}$= 17.3 GeV around midrapidity by the CERES/NA45 experiment at the CERN SPS in 0--30% central PbAu collisions with a mean centrality of 5.5%. The analysis is performed in two centrality bins as a function of the transverse momentum $\mathrm{p_{\mathrm{T}}}$ from 0.05 GeV/$c$ to more than 2 GeV/$c$. This is the first measurement of the $v^{1/3}_{3}/v^{1/2}_{2}…

This https://arxiv.org/abs/2310.20295 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hepe…

First observation and study of the $K^{\pm} \rightarrow π^{0} π^{0} μ^{\pm} ν$ decay
The NA48/2 experiment at CERN reports the first observation of the $K^{\pm} \rightarrow π^{0} π^{0} μ^{\pm} ν$ decay based on a sample of 2437 candidates with 15% background contamination collected in 2003--2004. The decay branching ratio in the kinematic region of the squared dilepton mass above $0.03$~GeV$^2/c^4$ is measured to be $(0.65 \pm 0.03) \times 10^{-6}$. The extrapolation to the full kinematic space, using a specific model, is found to be $(3.45 \pm 0.16) \times 10^{-6}$, in agr…

Quench Performance of the First Pre-series AUP Cryo-assembly
M. BaldiniApplied Physics and Superconductivity Technology Directorate, Fermi National Accelerator Laboratory, Batavia, IL, USA, G. ChlachidzeApplied Physics and Superconductivity Technology Directorate, Fermi National Accelerator Laboratory, Batavia, IL, USA, G. ApollinariApplied Physics and Superconductivity Technology Directorate, Fermi National Accelerator Laboratory, Batavia, IL, USA, J. DimarcoApplied Physics and Superc…

Quench Performance of the First Pre-series AUP Cryo-assembly
The High Luminosity upgrade of the Large Hadron Collider (HL-LHC) at CERN will include eight cryo-assemblies that are expected to be fabricated and delivered to CERN by the US HL-LHC Accelerator Upgrade Project (AUP) as part of the U.S. contributions to the HL-LHC. These cryostat assemblies are the quadrupole magnetic components of the HL-LHC Q1 and Q3 inner triplet optical elements in front of the two interaction points. Each cryo-assembly consists of two 4.2 m long Nb3Sn quadrupole magnets wi…

This https://arxiv.org/abs/2312.07484 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hepe…

Search for long-lived heavy neutral leptons with lepton flavour conserving or violating decays to a jet and a charged lepton
A search for long-lived heavy neutral leptons (HNLs) is presented, which considers the hadronic final state and coupling scenarios involving all three lepton generations in the 2-20 GeV HNL mass range for the first time. Events comprising two leptons (electrons or muons) and jets are analyzed in a data sample of proton-proton collisions, recorded with the CMS experiment at the CERN LHC at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 138 fb$^{-1}$. A novel jet …

New insights on fission of 235U induced by high energy neutrons
Alice Manna, Elisa Pirovano
https://arxiv.org/abs/2403.11711 https://…

New insights on fission of 235U induced by high energy neutrons
The $^{235}$U(n,f) reaction cross section was measured relative to neutron-proton elastic scattering for the first time in the energy region from 10 MeV to 440 MeV at the CERN n\_TOF facility. Two independent detection systems were used simultaneously to extract the fission cross section. For neutron energies below 200 MeV, the present results agree within one standard deviation with the data available in literature and are well reproduced by the IAEA evaluation. Above 200 MeV, the comparison o…

Neutrino Rate Predictions for FASER
FASER Collaboration
https://arxiv.org/abs/2402.13318 https://arxiv.org/pdf/2402.13318

Neutrino Rate Predictions for FASER
The Forward Search Experiment (FASER) at CERN's Large Hadron Collider (LHC) has recently directly detected the first collider neutrinos. Neutrinos play an important role in all FASER analyses, either as signal or background, and it is therefore essential to understand the neutrino event rates. In this study, we update previous simulations and present prescriptions for theoretical predictions of neutrino fluxes and cross sections, together with their associated uncertainties. With these results,…

This https://arxiv.org/abs/2312.09883 has been replaced.
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Pixel detector hybridization and integration with anisotropic conductive adhesives
A reliable and cost-effective interconnect technology is required for the development of hybrid pixel detectors. The interconnect technology needs to be adapted for the pitch and die sizes of the respective applications. For small-scale applications and during the ASIC and sensor development phase, interconnect technologies must also be suitable for the assembly of single-dies typically available from Multi-Project-Wafer submissions. Within the CERN EP R&D program and the AIDAinnova collaborati…

This https://arxiv.org/abs/2311.15867 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hepe…

Constraining models of hadronic showers using proton-Oxygen collisions at the LHC involving proton/neutron tagging
The study of hadronic showers, which are produced by cosmic rays penetrating the Earth's atmosphere, is essential for shedding light on the origins and characteristics of high-energy particles originating from space and reaching our planet. At the Large Hadron Collider at CERN, there are plans to conduct a short run of proton--oxygen collisions in 2025 to refine the modeling of hadronic showers. This work explores the potential impact on constraining models of hadronic showers by measuring inte…

Search for long-lived particles decaying to final states with a pair of muons in proton-proton collisions at $\sqrt{s}$ = 13.6 TeV
CMS Collaboration
https://arxiv.org/abs/2402.14491

Search for long-lived particles decaying to final states with a pair of muons in proton-proton collisions at $\sqrt{s}$ = 13.6 TeV
An inclusive search for long-lived exotic particles (LLPs) decaying to final states with a pair of muons is presented. The search uses data corresponding to an integrated luminosity of 36.6 fb$^{-1}$ collected by the CMS experiment from the proton-proton collisions at $\sqrt{s}$ = 13.6 TeV in 2022, the first year of Run 3 of the CERN LHC. The experimental signature is a pair of oppositely charged muons originating from a common vertex spatially separated from the proton-proton interaction point…

This https://arxiv.org/abs/2306.06153 has been replaced.
initial toot: https://mastoxiv.page/@ar…

A Large-Scale Pad-Sensor Based Prototype of the Silicon Tungsten Electromagnetic Calorimeter for the Forward Direction in ALICE at LHC
We constructed a large-scale electromagnetic calorimeter prototype as a part of the Forward Calorimeter upgrade project (FoCal) for the ALICE experiment at the Large Hadron Collider (LHC). The prototype, also known as ``Mini FoCal'', consists of 20 layers of silicon pad sensors and tungsten alloy plates with printed circuit boards and readout electronics. The constructed detector was tested at the test beam facility of the Super Proton Synchrotron (SPS) at CERN. We obtain an energy resolution o…

Search for a light muon-philic $Z'$ with the NA64-$e$ experiment at CERN
Yu. M. Andreev, A. Antonov, D. Banerjee, B. Banto Oberhauser, J. Bernhard, P. Bisio, A. Celentano, N. Charitonidis, D. Cooke, P. Crivelli, E. Depero, A. V. Dermenev, S. V. Donskov, R. R. Dusaev, T. Enik, V. N. Frolov, A. Gardikiotis, S. N. Gninenko, M. H\"osgen, V. A. Kachanov, Y. Kambar, A. E. Karneyeu, G. Kekelidze, B. Ketzer, D. V. Kirpichnikov, M. M. Kirsanov, V. N. Kolosov, S. V. Gertsenberger, S. Gi…

Search for a light muon-philic $Z'$ with the NA64-$e$ experiment at CERN
The inclusion of an additional U(1) gauge $L_μ - L_τ$ symmetry would release the tension between the measured and the predicted value of the anomalous muon magnetic moment: this paradigm assumes the existence of a new, light $Z'$ vector boson, with dominant coupling to $μ$ and $τ$ and interacting with electrons via a loop mechanism. The $L_μ - L_τ$ model can also explain the Dark Matter relic abundance, by assuming that the $Z'$ boson acts as a "portal" to a new Dark Sector of particles i…

Swedish Beams -- The Story of Particle Accelerators in Sweden
Volker Ziemann
https://arxiv.org/abs/2404.07088 https://arxiv.org/pdf/2…

Swedish Beams -- The Story of Particle Accelerators in Sweden
Even though many of the experiments leading to the standard model of particle physics were done at large accelerator laboratories in the US and at CERN[1] many exciting developments happened in smaller national facilities all over the world. In this report we highlight the history of accelerator facilities in Sweden which was home to the highest-energy cyclotron in Europe for some time in the early 1950s. [1] For a brief history of this story see: V. Ziemann, Beams -- the Story of Particle Ac…

A Segmented Total Energy Detector (sTED) optimized for $(n,\gamma)$ cross-section measurements at n_TOF EAR2
V. Alcayne, D. Cano-Ott, J. Garcia, E. Gonzalez-Romero, T. Martinez, A. Perez de Rada, J. Plaza, A. Sanchez-Caballero, J. Balibrea-Correa, C. Domingo-Pardo, J. Lerendegui-Marco, A. Casanovas, F. Calvino, O. Aberle, the n_TOF collaboration
http…

A Segmented Total Energy Detector (sTED) optimized for $(n,γ)$ cross-section measurements at n_TOF EAR2
The neutron time-of-flight facility n_TOF at CERN is a spallation source dedicated to measurements of neutron-induced reaction cross-sections of interest in nuclear technologies, astrophysics, and other applications. Since 2014, Experimental ARea 2 (EAR2) is operational and delivers a neutron fluence of $4\times 10^7$ neutrons per nominal proton pulse, which is 50 times higher than the one of Experimental ARea 1 (EAR1) of $8\times10^5$ neutrons per pulse. The high neutron flux at EAR2 results i…

Nuclear charge radii of germanium isotopes around $N$ = 40
S. J. Wang, A. Kanellakopoulos, X. F. Yang, S. W. Bai, J. Billowes, M. L. Bissell, K. Blaum, B. Cheal, C. S. Devlin, R. F. Garcia Ruiz, J. Z. Han, H. Heylen, S. Kaufmann, K. Konig, A. Koszorus, S. Lechner, S. Malbrunot-Ettenauer, W. Nazarewicz, R. Neugart, G. Neyens, W. Nortershauser, T. Ratajczyk, P. -G. Reinhard, L. V. Rodr{\i}guez, S. Sels, L. Xie, Z. Y. Xu, D. T. Yordanov, Y. M. Yu

Nuclear charge radii of germanium isotopes around $N$ = 40
Collinear laser spectroscopy measurements were performed on $^{68-74}$Ge isotopes ($Z = 32$) at ISOLDE-CERN, by probing the $4s^2 4p^2 \, ^3\!P_1 \rightarrow 4s^2 4p 5s \, ^3\!P_1^o$ atomic transition (269~nm) of germanium. Nuclear charge radii are determined via the measured isotope shifts, revealing a larger local variation than the neighboring isotopic chains. Nuclear density functional theory with the Fayans functionals Fy($Δr$,HFB) and Fy(IVP), and the SV-min Skyrme describes the experime…

This https://arxiv.org/abs/2311.01837 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hepe…

Measurement of the $K^+\toπ^+γγ$ decay
A sample of 3984 candidates of the $K^+\toπ^+γγ$ decay, with an estimated background of $291\pm14$ events, was collected by the NA62 experiment at CERN during 2017-2018. In order to describe the observed di-photon mass spectrum, the next-to-leading order contribution in chiral perturbation theory was found to be necessary. The decay branching ratio in the full kinematic range is measured to be $(9.61\pm0.17)\times10^{-7}$. The first search for production and prompt decay of an axion-like par…

Measurements of Lund subjet multiplicities in 13 TeV proton-proton collisions with the ATLAS detector
ATLAS Collaboration
https://arxiv.org/abs/2402.13052 …

Measurements of Lund subjet multiplicities in 13 TeV proton-proton collisions with the ATLAS detector
This Letter presents a differential cross-section measurement of Lund subjet multiplicities, suitable for testing current and future parton shower Monte Carlo algorithms. This measurement is made in dijet events in 140 fb$^{-1}$ of $\sqrt{s}=13$ TeV proton-proton collision data collected with the ATLAS detector at CERN's Large Hadron Collider. The data are unfolded to account for acceptance and detector-related effects, and are then compared with several Monte Carlo models and to recent resumme…

This https://arxiv.org/abs/2312.17188 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hepe…

Development of a new CEDAR for kaon identification at the NA62 experiment at CERN
The NA62 experiment at CERN utilises a differential Cherenkov counter with achromatic ring focus (CEDAR) for tagging kaons within an unseparated monochromatic beam of charged hadrons. The CEDAR-H detector was developed to minimise the amount of material in the path of the beam by using hydrogen gas as the radiator medium. The detector was shown to satisfy the kaon tagging requirements in a test-beam before installation and commissioning at the experiment. The CEDAR-H performance was measured us…

Combination of searches for heavy spin-1 resonances using 139 fb$^{-1}$ of proton-proton collision data at $\sqrt{s} = 13$ TeV with the ATLAS detector
ATLAS Collaboration
https://arxiv.org/abs/2402.10607

Combination of searches for heavy spin-1 resonances using 139 fb$^{-1}$ of proton-proton collision data at $\sqrt{s} = 13$ TeV with the ATLAS detector
A combination of searches for new heavy spin-1 resonances decaying into different pairings of $W$, $Z$, or Higgs bosons, as well as directly into leptons or quarks, is presented. The data sample used corresponds to 139 fb$^{-1}$ of proton-proton collisions at $\sqrt{s}$ = 13 TeV collected during 2015-2018 with the ATLAS detector at the CERN Large Hadron Collider. Analyses selecting quark pairs ($qq$, $bb$, $t\bar{t}$, and $tb$) or third-generation leptons ($τν$ and $ττ$) are included in thi…

Combination of searches for heavy spin-1 resonances using 139 fb$^{-1}$ of proton-proton collision data at $\sqrt{s} = 13$ TeV with the ATLAS detector
ATLAS Collaboration
https://arxiv.org/abs/2402.10607

Combination of searches for heavy spin-1 resonances using 139 fb$^{-1}$ of proton-proton collision data at $\sqrt{s} = 13$ TeV with the ATLAS detector
A combination of searches for new heavy spin-1 resonances decaying into different pairings of $W$, $Z$, or Higgs bosons, as well as directly into leptons or quarks, is presented. The data sample used corresponds to 139 fb$^{-1}$ of proton-proton collisions at $\sqrt{s}$ = 13 TeV collected during 2015-2018 with the ATLAS detector at the CERN Large Hadron Collider. Analyses selecting quark pairs ($qq$, $bb$, $t\bar{t}$, and $tb$) or third-generation leptons ($τν$ and $ττ$) are included in thi…

Searching for Lepton Flavor Violation with the CMS Experiment
Jian Wang
https://arxiv.org/abs/2403.12817 https://arxiv.org/pdf/2403.1…

Searching for Lepton Flavor Violation with the CMS Experiment
Searches for lepton flavor violation (LFV) stand at the forefront of experimental particle physics research, offering a sensitive probe to many scenarios of physics beyond the Standard Model. The high proton-proton collision energy and luminosity provided by the CERN Large Hadron Collider (LHC) and the excellent CMS detector performance allow for an extensive program of LFV searches. This article reviews a broad range of LFV searches conducted at the CMS experiment using data collected in LHC R…

This https://arxiv.org/abs/2303.13070 has been replaced.
initial toot: https://mastoxiv.page/@ar…

Development of proton beam irradiation system for the NA65/DsTau experiment
Tau neutrino is the least studied lepton of the Standard Model (SM). The NA65/DsTau experiment targets to investigate $D_s$, the parent particle of the $ν_τ$, using the nuclear emulsion-based detector and to decrease the systematic uncertainty of $ν_τ$ flux prediction from over 50% to 10% for future beam dump experiments. In the experiment, the emulsion detectors are exposed to the CERN SPS 400 GeV proton beam. To provide optimal conditions for the reconstruction of interactions, the proton…

This https://arxiv.org/abs/2404.06982 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hepe…

Search for a light muon-philic $Z'$ with the NA64-$e$ experiment at CERN
The inclusion of an additional U(1) gauge $L_μ - L_τ$ symmetry would release the tension between the measured and the predicted value of the anomalous muon magnetic moment: this paradigm assumes the existence of a new, light $Z'$ vector boson, with dominant coupling to $μ$ and $τ$ and interacting with electrons via a loop mechanism. The $L_μ - L_τ$ model can also explain the Dark Matter relic abundance, by assuming that the $Z'$ boson acts as a "portal" to a new Dark Sector of particles i…

This https://arxiv.org/abs/2303.13070 has been replaced.
initial toot: https://mastoxiv.page/@ar…

Development of proton beam irradiation system for the NA65/DsTau experiment
Tau neutrino is the least studied lepton of the Standard Model (SM). The NA65/DsTau experiment targets to investigate $D_s$, the parent particle of the $ν_τ$, using the nuclear emulsion-based detector and to decrease the systematic uncertainty of $ν_τ$ flux prediction from over 50% to 10% for future beam dump experiments. In the experiment, the emulsion detectors are exposed to the CERN SPS 400 GeV proton beam. To provide optimal conditions for the reconstruction of interactions, the proton…

This https://arxiv.org/abs/2304.03836 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hepe…

Nanosecond anomaly detection with decision trees and real-time application to exotic Higgs decays
We present an interpretable implementation of the autoencoding algorithm, used as an anomaly detector, built with a forest of deep decision trees on FPGA, field programmable gate arrays. Scenarios at the Large Hadron Collider at CERN are considered, for which the autoencoder is trained using known physical processes of the Standard Model. The design is then deployed in real-time trigger systems for anomaly detection of unknown physical processes, such as the detection of rare exotic decays of t…

RADES axion search results with a High-Temperature Superconducting cavity in an 11.7 T magnet
S. Ahyoune, A. \'Alvarez Melc\'on, S. Arguedas Cuendis, S. Calatroni, C. Cogollos, A. D\'iaz-Morcillo, B. D\"obrich, J. D. Gallego, J. M. Garc\'ia-Barcel\'o, B. Gimeno, J. Golm, X. Granados, J. Gutierrez, L. Herwig, I. G. Irastorza, N. Lamas, A. Lozano-Guerrero, W. L. Millar, C. Malbrunot, J. Miralda-Escud\'e, P. Navarro, J. R. Navarro-Madrid, T. Puig, M. Siodlacze…

RADES axion search results with a High-Temperature Superconducting cavity in an 11.7 T magnet
We describe the results of a haloscope axion search performed with an 11.7 T dipole magnet at CERN. The search used a custom-made radio-frequency cavity coated with high-temperature superconducting tape. A set of 27 h of data at a resonant frequency of around 8.84 GHz was analysed. In the range of axion mass 36.5676 $μ$eV to 36.5699 $μ$eV, corresponding to a width of 554 kHz, no signal excess hinting at an axion-like particle was found. Correspondingly, in this mass range, a limit on the axio…

This https://arxiv.org/abs/2309.03501 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hepe…

Evidence for the Higgs boson decay to a $Z$ boson and a photon at the LHC
The first evidence for the Higgs boson decay to a $Z$ boson and a photon is presented, with a statistical significance of 3.4 standard deviations. The result is derived from a combined analysis of the searches performed by the ATLAS and CMS Collaborations with proton-proton collision data sets collected at the CERN Large Hadron Collider (LHC) from 2015 to 2018. These correspond to integrated luminosities of around 140 fb$^{-1}$ for each experiment, at a center-of-mass energy of 13 TeV. The meas…

The quest to discover supersymmetry at the ATLAS experiment
ATLAS Collaboration
https://arxiv.org/abs/2403.02455 https://arxiv.org/pdf/2403.02455
arXiv:2403.02455v1 Announce Type: new
Abstract: The search for supersymmetry with the ATLAS experiment at the CERN Large Hadron Collider intensified after the discovery of the Higgs boson in 2012. The search programme expanded in both breadth and depth, profiting from the increased integrated luminosity and higher centre-of-mass energy of Run 2, and gaining new sensitivity to unexplored areas of supersymmetry parameter space through the use of new experimental signatures and innovative analysis techniques. This report summarises the supersymmetry searches at ATLAS using up to 140 fb$^{-1}$ of $pp$ collisions at $\sqrt{s} = 13$ TeV, including the limits set on the production of gluinos, squarks, and electroweakinos for scenarios either with or without R-parity conservation, and including models where some of the supersymmetric particles are long-lived.

Sparks in the Dark
Olga Sunneborn Gudnadottir, Axel Gall\'en, Giulia Ripellino, Jochen Jens Heinrich, Raazesh Sainudiin, Rebeca Gonzalez Suarez
https://arxiv.org/abs/2404.04138

Sparks in the Dark
This study presents a novel method for the definition of signal regions in searches for new physics at collider experiments, specifically those conducted at CERN's Large Hadron Collider. By leveraging multi-dimensional histograms with precise arithmetic and utilizing the SparkDensityTree library, it is possible to identify high-density regions within the available phase space, potentially improving sensitivity to very small signals. Inspired by an ongoing search for dark mesons at the ATLAS exp…

Search for long-lived heavy neutrinos in the decays of B mesons produced in proton-proton collisions at $\sqrt{s}$ = 13 TeV
CMS Collaboration
https://arxiv.org/abs/2403.04584

Search for long-lived heavy neutrinos in the decays of B mesons produced in proton-proton collisions at $\sqrt{s}$ = 13 TeV
A search for long-lived heavy neutrinos (N) in the decays of \PB mesons produced in proton-proton collisions at $\sqrt{s}$ = 13 TeV is presented. The data sample corresponds to an integrated luminosity of 41.6 fb$^{-1}$ collected in 2018 by the CMS experiment at the CERN LHC, using a dedicated data stream that enhances the number of recorded events containing B mesons. The search probes heavy neutrinos with masses in the range 1 $\lt$ $m_\mathrm{N}$ $\lt$ 3 GeV and decay lengths in the range 10…

Search for heavy neutral leptons in final states with electrons, muons, and hadronically decaying tau leptons in proton-proton collisions at $\sqrt{s}$ =13 TeV
CMS Collaboration
https://arxiv.org/abs/2403.00100

Search for heavy neutral leptons in final states with electrons, muons, and hadronically decaying tau leptons in proton-proton collisions at $\sqrt{s}$ =13 TeV
A search for heavy neutral leptons (HNLs) of Majorana or Dirac type using proton-proton collision data at $\sqrt{s}$ =13 TeV is presented. The data were collected by the CMS experiment at the CERN LHC and correspond to an integrated luminosity of 138 fb$^{-1}$. Events with three charged leptons (electrons, muons, and hadronically decaying tau leptons) are selected, corresponding to HNL production in association with a charged lepton and decay of the HNL to two charged leptons and a standard mod…

Constraints on anomalous Higgs boson couplings from its production and decay using the WW channel in proton-proton collisions at $\sqrt{s}$ = 13 TeV
CMS Collaboration
https://arxiv.org/abs/2403.00657

Constraints on anomalous Higgs boson couplings from its production and decay using the WW channel in proton-proton collisions at $\sqrt{s}$ = 13 TeV
A study of the anomalous couplings of the Higgs boson to vector bosons, including $CP$-violation effects, has been conducted using its production and decay in the WW channel. This analysis is performed on proton-proton collision data collected with the CMS detector at the CERN LHC during 2016-2018 at a center-of-mass energy of 13 TeV, and corresponds to an integrated luminosity of 138 fb$^{-1}$. The different-flavor dilepton (e$μ$) final state is analyzed, with dedicated categories targeting g…