Fri·Jun 2, 2023Friday·June 2, 2023

1. 01*

   Complete Formalism of Cross Sections and Asymmetries for Longitudinally and Transversely Polarized Leptons and Hadrons in Deep Inelastic Scattering

   Paul Anderson🇺🇸 · Douglas Higinbotham🇺🇸 · Sonny Mantry🇺🇸 · Xiaochao Zheng🇺🇸

   Studies of the Deep Inelastic Scattering (DIS) have provided fundamental information of the nucleon structure for decades. The electron-ion collider (EIC) will be the first collider capable of DIS study with both polarized lepton and polarized hadron beams, providing the possibility of accessing new electroweak structure functions of the nucleon. In this work, we completed the DIS cross section derivations for both longitudinally and transversely polarized leptons and hadrons, with no approximations made, and with all three contributions $\gamma \gamma ,\gamma Z,ZZ$ included. These results were derived using primarily tensor algebra and Feynman calculus, starting from previously established leptonic and hadronic tensors and carry out their contraction. Our results are presented in terms of both spin-averaged and spin-dependent cross sections, allowing direct comparison with experimentally measured cross sections and their asymmetries. We include also in our discussion comparisons of different conventions that exist in the literature.

   ↳ hep-phhep-exnucl-exnucl-th2 citations
2. 02*

   Elastic pion-proton and pion-pion scattering via the holographic Pomeron and Reggeon exchange

   Zhibo Liu🇨🇳 · Akira Watanabe🇨🇳

   The elastic pion-proton and pion-pion scattering are studied in a holographic QCD model, focusing on the Regge regime. Taking into account the Pomeron and Reggeon exchange, which are described by the Reggeized $2^{++}$ glueball and vector meson propagator respectively, the total and differential cross sections are calculated. The adjustable parameters involved in the model are determined with the experimental data of the pion-proton total cross sections. The differential cross sections can be predicted without any additional parameters, and it is shown that our predictions are consistent with the data. The energy dependence of the Pomeron and Reggeon contribution is also discussed.

   ↳ hep-phhep-exnucl-exnucl-thPRD(2023)·6 citations
3. 03*

   Underground laboratory JUNA shedding light on stellar nucleosynthesis

   Toshitaka Kajino🇨🇳

   Extremely low background experiments to measure key nuclear reaction cross sections of astrophysical interest are conducted at the world's deepest underground laboratory, the Jingping Underground laboratory for Nuclear Astrophysics (JUNA). High precision measurements provide reliable information to understand nucleosynthetic processes in celestial objects and resolve mysteries on the origin of atomic nuclei discovered in the first generations of Pop. III stars in the universe and meteoritic SiC grains in the solar system.

   ↳ astro-ph.GAnucl-exNucl.Sci.Tech.(2023)·9 citations
4. 04*

   Effects of sequential decay on collective flows and nuclear stopping power in heavy-ion collisions at intermediate energies

   Kui Xiao · PengCheng Li🇨🇳 · YongJia Wang🇨🇳 · FuHu Liu🇨🇳 · QingFeng Li🇨🇳

   In this study, the rapidity distribution, collective flows, and nuclear stopping power in ${}^{197}\mathrm{Au}{+}^{197}\mathrm{Au}$ collisions at intermediate energies were investigated using the ultrarelativistic quantum molecular dynamics (UrQMD) model with GEMINI++ code. The UrQMD model was adopted to simulate the dynamic evolution of heavy-ion collisions, whereas the GEMINI++ code was used to simulate the decay of primary fragments produced by UrQMD. The calculated results were compared with the INDRA and FOPI experimental data. It was found that the rapidity distribution, collective flows, and nuclear stopping power were affected to a certain extent by the decay of primary fragments, especially at lower beam energies. Furthermore, the experimental data of the collective flows and nuclear stopping power at the investigated beam energies were better reproduced when the sequential decay effect was included.

   ↳ nucl-thnucl-exNucl.Sci.Tech.(2023)·14 citations
5. 05*

   Proton charge radius extraction from muon scattering at MUSE using dispersively improved chiral effective field theory

   F. Gil-Domínguez🇪🇸 · J. M. Alarcón🇪🇸 · C. Weiss🇺🇸

   The MUSE experiment at Paul Scherrer Institute will perform the first measurement of low-energy muon-proton elastic scattering (muon lab momenta 115-210 MeV) with the aim of determining the proton charge radius. We study the prospects for the proton radius extraction using the theoretical framework of Dispersively Improved Chiral Effective Field Theory (DI$\chi$EFT). It connects the proton radii with the finite-$Q^2$ behavior of the form factors through complex analyticity and enables the use of data up to $Q^2\sim$ 0.1 GeV${}^2$ for radius extraction. We quantify the sensitivity of the $\mu p$ cross section to the proton charge radius, the theoretical uncertainty of the cross section predictions, and the size of two-photon exchange corrections. We find that the optimal kinematics for radius extraction at MUSE is at momenta 210 MeV and $Q^2\sim$ 0.05-0.08 GeV${}^2$. We compare the performance of electron and muon scattering in the same kinematics. As a byproduct, we obtain explicit predictions for the $\mu p$ and $ep$ cross sections at MUSE as functions of the assumed value of the proton radius.

   ↳ hep-phhep-exnucl-exnucl-thPRD(2023)·6 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.