Tootfinder

Interplay between Vector-like Lepton and Seesaw Mechanism:Oblique Corrections
Shuyang Han, Zhaofeng Kang, Jiang Zhu
https://arxiv.org/abs/2404.19502 https://arxiv.org/pdf/2404.19502
arXiv:2404.19502v1 Announce Type: new
Abstract: The non-vanishing neutrino mass strongly hints the existence of right-handed neutrinos (RHNs), singlets of the standard model (SM). However, they are highly decoupled from the SM and difficult to probe. In this work, we consider the Majorana RHNs from the type-I seesaw mechanism may well mix with the heavy neutral lepton dwelling in certain vector-like lepton (VLL), thus acquiring a sizable electroweak charge. Such a simple scenario yields many interesting consequences, and the imprint on oblique corrections, well expected from the mass splitting between components of VLL by virtue of VLL-RHN mixing, is our focus here. We analytically calculate the Peskin-Takeuchi parameters S, T and U with full details, carefully treating the Majorana loop to obtain the self consistent expressions free of divergence. Then, we constrain on the VLL-RHN system which only gives a sizable $T$ parameter using the PDG-2021 data and CDF-II data, separately, by imposing $T\lesssim{\cal O}(0.1)$. It is found that for the RHN and VLL below the TeV scale, with a properly large mixing, stands in the frontier of the electroweak precision test such as W-boson mass.

Took longer than I wanted and included a Best Buy run, but I am now running on the new HW and Holy Shit. Launched Firefox and started catching up and thought "hey what's the CPU load?" 0%. With 9 pinned tabs. So I loaded 20 more tabs (I keep a bunch of things in tabs I don't wanna bookmark lol) and checked again. 2-5% load. In the immortal words of Calculon: "I'm not familiar with the type of thing I'm seeing.." Time to check out a couple games.

Florida is continuing to “callously” strip healthcare coverage from thousands of children in
lower-income households
💥in defiance of a new federal law intended to protect them.💥
👉Since 1 January, more than 22,500 children have been disenrolled from Florida KidCare,
its version of the Children’s Health Insurance Program (Chip) that is jointly subsidized by states and the US government for families with earnings just above the threshold for Medicaid.
Florida healt…

Nvidia acquires AI infrastructure orchestration and management platform Run:ai, a source says for ~$700M; Run:ai, founded in 2018, raised $118M in total (Meir Orbach/CTech)
https://www.calcalistech.com/ctechnews/article/hjtvafiwc

Nvidia announces $700 million acquisition of Run:ai
Run:ai enables enterprise customers to manage and optimize their compute infrastructure, whether on premises, in the cloud or in hybrid environments.

Magnetism, heat capacity and electronic structure of EuCd$_2$P$_2$ in view of its colossal magnetoresistance
Dmitry Yu. Usachov, Sarah Krebber, Kirill A. Bokai, Artem V. Tarasov, Marvin Kopp, Charu Garg, Alexander Virovets, Jens M\"uller, Max Mende, Georg Poelchen, Denis V. Vyalikh, Cornelius Krellner, Kristin Kliemt
https://

Magnetism, heat capacity and electronic structure of EuCd$_2$P$_2$ in view of its colossal magnetoresistance
The mechanism of the peculiar transport properties around the magnetic ordering temperature of semiconducting antiferromagnetic EuCd$_2$P$_2$ is not yet understood. With a huge peak in the resistivity observed above the Néel temperature, $T_{\rm N}=10.6\,\rm K$, it exhibits a colossal magnetoresistance effect. Recent reports on observations of ferromagnetic contributions above $T_{\rm N}$ as well as metallic behavior below this temperature have motivated us to perform a comprehensive character…

Beyond the random phase approximation for calculating Curie temperatures in ferromagnets: application to Fe, Ni, Co and monolayer CrI3
Varun Rajeev Pavizhakumari, Thorbj{\o}rn Skovhus, Thomas Olsen
https://arxiv.org/abs/2405.00477

Beyond the random phase approximation for calculating Curie temperatures in ferromagnets: application to Fe, Ni, Co and monolayer CrI3
The magnetic properties of solids are typically analyzed in terms of Heisenberg models where the electronic structure is approximated by interacting localized spins. However, even in such models the evaluation of thermodynamic properties constitutes a major challenge and is usually handled by a mean field decoupling scheme. The random phase approximation (RPA) comprises a common approach and is often applied to evaluate critical temperatures although it is well known that the method is only acc…

This https://arxiv.org/abs/2312.12071 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_mat…

On the de Rham homomorphism for $L_π$-cohomologies
We study the procedure of regularization in the context of the Lipschitz version of de Rham calculus on metric simplicial complexes with bounded geometry. It provides us with the machinery to handle the de Rham homomorphism for $L_π$-cohomologies. In this respect, we obtain the condition resolving the question of triviality of the kernel for de Rham homomorphism. In particular, we specify the non-trivial cohomology classes explicitly for a sequence of parameters $π= \langle p_0,\,p_1,\dots,\,…

Correlations between X-rays, Visible Light and Drive-Beam Energy Loss Observed in Plasma Wakefield Acceleration Experiments at FACET-II
Chaojie Zhang, Doug Storey, Pablo San Miguel Claveria, Zan Nie, Ken A. Marsh, Warren B. Mori, Erik Adli, Weiming An, Robert Ariniello, Gevy J. Cao, Christine Clark, Sebastien Corde, Thamine Dalichaouch, Christopher E. Doss, Claudio Emma, Henrik Ekerfelt, Elias Gerstmayr, Spencer Gessner, Claire Hansel, Alexander Knetsch, Valentina Lee, Fei Li, Mike Lit…

Correlations between X-rays, Visible Light and Drive-Beam Energy Loss Observed in Plasma Wakefield Acceleration Experiments at FACET-II
This study documents several correlations observed during the first run of the plasma wakefield acceleration experiment E300 conducted at FACET-II, using a single drive electron bunch. The established correlations include those between the measured maximum energy loss of the drive electron beam and the integrated betatron x-ray signal, the calculated total beam energy deposited in the plasma and the integrated x-ray signal, among three visible light emission measuring cameras, and between the v…

This https://arxiv.org/abs/2308.07955 has been replaced.
initial toot: https://mastoxiv.page/@arXiv_hepp…

Cosmological Implications of Gauged $U(1)_{B-L}$ on $ΔN_{\rm eff}$ in the CMB and BBN
We calculate the effects of a light, very weakly-coupled boson $X$ arising from a spontaneously broken $U(1)_{B-L}$ symmetry on $ΔN_{\rm eff}$ as measured by the CMB and $Y_p$ from BBN. Our focus is the mass range $1 \; {\rm eV} \lesssim m_X \lesssim 100 \; {\rm MeV}$; masses lighter than about an ${\rm eV}$ have strong constraints from fifth-force law constraints, while masses heavier than about 100 MeV are constrained by other probes. We do not assume $X$ began in thermal equilibrium with th…