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Role of meson exchange and final-state interaction in $J/\psi$-meson photoproduction
Sang-Ho Kim
https://arxiv.org/abs/2507.22405 https://arxiv.org/pdf/250…

Role of meson exchange and final-state interaction in $J/ψ$-meson photoproduction
We investigate $J/ψ$ photoproduction off the nucleon using a dynamical model based on a Hamiltonian framework. First, Pomeron exchange is regarded as a background contribution that accounts for the gradual rise of the total cross section with increasing beam energy. Then, the meson-exchange and direct $J/ψ$-radiation contributions are included as part of the Born term. More specifically, we examine the contributions of the light-meson [$π^0(135)$, $η(548)$, $η'(958)$, $f_1(1285)$] and char…

Hab ich das richtig verstanden, daß Bundes­bildungs­ministerin #Prien was gegen Sonderzeichen und Binnen-I hat und deswegen jetzt alle phettbergen sollten?

Pilot-to-Data Power Ratio in RIS-Assisted Multiantenna Communication
Masoud Sadeghian, Angel Lozano, Gabor Fodor
https://arxiv.org/abs/2507.21785 https://a…

Pilot-to-Data Power Ratio in RIS-Assisted Multiantenna Communication
The optimization of the \gls{pdpr} is a recourse that helps wireless systems to acquire channel state information while minimizing the pilot overhead. While the optimization of the \gls{pdpr} in cellular networks has been studied extensively, the effect of the \gls{pdpr} in \gls{ris}-assisted networks has hardly been examined. This paper tackles this optimization when the communication is assisted by a RIS whose phase shifts are adjusted on the basis of the statistics of the channels. For a set…

Coupled-channel contributions to the GDH sum rule from the J\"ulich-Bonn approach
Carolin Schneider, Deborah R\"onchen, Christoph Hanhart, Ulf-G. Mei{\ss}ner
https://arxiv.org/abs/2508.00598 …

Coupled-channel contributions to the GDH sum rule from the Jülich-Bonn approach
We study the Gerasimov-Drell-Hearn (GDH) sum rule within a dynamical coupled-channel approach, the Jülich-Bonn model for light baryon resonances based on fits to an extensive data base of pion and photon induced data. Recently published photoproduction data for different observables with $πN$ and $ηN$ final states are analyzed simultaneously with older data for the reactions $πN\to πN$, $ηN$, $KΛ$, $KΣ$ and $γp\toπN$, $ηN$, $KΛ$, $KΣ$. The impact of the new data on the resonance sp…

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Kitose žiniose Matijošaika vėl partrenkė per perėją einantį žmogų:
https://www.lrt.lt/naujienos/lietuvoje/2/2600205/rolls-royce-vairaves-matijosaitis-partrenke-per-pereja-ejusi-vyra

Exclusive heavy vector meson photoproduction in $pp$ and $pPb$ collisions within the GPD approach: A phenomenological analysis
Ya-Ping Xie, Victor P. Gon\c{c}alves
https://arxiv.org/abs/2507.20448

Exclusive heavy vector meson photoproduction in $pp$ and $pPb$ collisions within the GPD approach: A phenomenological analysis
The exclusive $J/ψ$ and $Υ$ photoproduction in proton - proton ($pp$) and proton - lead ($pPb$) collisions at the LHC energies is investigated using the Generalized Parton Distribution (GDP) approach. Assuming the Goloskokov - Kroll (GK) model, we estimate the corresponding total cross - sections and rapidity distributions considering different parametrizations for the unpolarized gluon distribution of the proton. In particular, we compare the linear predictions, associated with DGLAP evoluti…

Evaluating the ratio of the exclusive vector meson photoproduction to inclusive hadron/jet production cross section in ultraperipheral heavy ion collisions
Joao Vitor C. Lovato, Edgar Huayra, Magno V. T. Machado
https://arxiv.org/abs/2508.18438

Evaluating the ratio of the exclusive vector meson photoproduction to inclusive hadron/jet production cross section in ultraperipheral heavy ion collisions
Using the QCD color dipole picture to exclusive vector meson and inclusive jet/open meson photoproduction, we calculate the ratio of the elastic meson production and inclusive hadron production cross sections for ultraperipheral heavy ion collisions. Predictions are evaluated for run 4 of the Large Hadron Collider in proton-nucleus ($pA$) and nucleus-nucleus ($AA$) collisions. The dependencies of the ratio on jet/hadron transverse momentum and atomic number are investigated. The double ratio $R…

Relativistic corrections to exclusive photoproduction of Quarkonia near-threshold
Sarah K. Blask, Sean Fleming, Thomas Mehen, Jyotirmoy Roy, Iain W. Stewart, Fanyi Zhao
https://arxiv.org/abs/2506.18905

Relativistic corrections to exclusive photoproduction of Quarkonia near-threshold
Non-relativistic QCD (NRQCD) is used to calculate the relativistic correction to the amplitude for exclusive photoproduction of vector Quarkonia in the near-threshold region within the generalized parton distribution (GPD) framework. The relativistic corrections are found to be large for $J/ψ$. Cross-sections for both $J/ψ$ and $Υ$ are calculated with the former being compared to the data. We also demonstrate the presence of endpoint divergences for the relativistic correction away from the …