Mon·Apr 8, 2024Monday·April 8, 2024

1. 01*

   Significance of the refraction effect on the $p$-$d$ elementary process in the ($p$,$pd$) reaction

   Kazuki Yoshida🇯🇵 · Yoshiki Chazono🇯🇵 · Kazuyuki Ogata🇯🇵

   The proton-induced deuteron knockout reaction, ($p$,$pd$), is one of the interests in the studies for probing the deuteron-like $p$-$n$ correlation in nuclei. According to a recent study of the inclusive deuteron-induced reaction, $(d,d^{\prime }x)$, the refraction effect of the deuteron has a significant effect on the elementary process, nucleon-deuteron ($N$-$d$) binary scattering inside a nucleus, of the reaction. In the paper, it is shown that proper treatment of the local $N$-$d$ relative momentum in the elementary process is crucial in $(d,d^{\prime }x)$ reactions at $100$ MeV and below. In the present work, we investigate the deuteron refraction effect in the exclusive ($p$,$pd$) reactions. We also discuss the incident energy dependence of the refraction effect. The refraction effect on the $p$-$d$ elementary process is taken into account by the local semiclassical approximation to the distorted waves. The results are compared with those obtained with the asymptotic momentum approximation, which is standardly applied to the distorted wave impulse approximation framework. It is shown that the refraction effect drastically changes the energy sharing distribution of the ${}^{16}$O($p$,$pd$)${}^{14}$N reaction at 101.3 MeV and gives a better agreement with experimental data. In contrast, it is confirmed that the effect is negligibly small at 250 MeV. We have clarified that the deuteron refraction effect is significant in the ${}^{16}$O($p$,$pd$)${}^{14}$N reaction at 101.3 MeV and the experimental data are well reproduced. The refraction effect plays a significant role in both the shape and magnitude of the ($p$,$pd$) cross section, while the effect is negligible at 250 MeV.

   ↳ nucl-thnucl-exPRC(2024)·5 citations
2. 02*

   Jet angularities in dijet production in proton-proton and heavy-ion collisions at RHIC

   Yang-Ting Chien🇺🇸 · Oleh Fedkevych🇺🇸 · Daniel Reichelt🇬🇧 · Steffen Schumann🇩🇪

   We study jet angularities for dijet production at the Relativistic Heavy Ion Collider (RHIC) in proton-proton (pp) and nucleus-nucleus (AA) collisions at 200 GeV nucleon-nucleon center-of-mass collision energy. In particular, we provide $\mathrm{NLL}$ resummed predictions for angularity observables of groomed and ungroomed jets produced in $\mathrm{pp}$ collisions matched to next-to-leading order QCD calculations resulting in $\mathrm{NLO}+\mathrm{NL}{\mathrm{L}}^{\prime }$ accuracy. Our parton-level predictions are corrected for non-perturbative effects, such as hadronization and underlying event, using parton-to-hadron level transfer matrices obtained with the Sherpa event generator. Furthermore, we use the Q-Pythia and JEWEL generators to estimate the impact of the interaction between quarks and gluons produced by the parton shower with the dense medium formed in heavy-ion collisions on the considered jet angularities.

   ↳ hep-phhep-exnucl-exnucl-thJHEP(2024)·18 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.