Thu·Oct 1, 2020Thursday·October 1, 2020

1. 01*

   Measurement of proton-proton elastic scattering into the Coulomb region at ${\text{P}}_{\text{beam}}$ = 2.5, 2.8 and 3.2 GeV/c

   H. Xu🇩🇪 · Y. Zhou🇨🇳 · U. Bechstedt🇩🇪 · J. Böker🇩🇪 · A. Gillitzer🇩🇪 · F. Goldenbaum🇩🇪 · D. Grzonka🇩🇪 · Q. Hu · A. Khoukaz🇩🇪 · F. Klehr🇩🇪 · B. Lorentz🇩🇪 · D. Prasuhn🇩🇪 and 9 other authors

   The proton--proton elastic differential cross section at very small four momentum transfer squared has been measured at three different incident proton momenta in the range of 2.5 to 3.2 GeV/c by detecting the recoil proton at polar angles close to $90^{\circ }$. The measurement was performed at COSY with the KOALA detector covering the Coulomb-nuclear interference region. The total cross section ${\sigma }_{\text{tot}}$, which has been determined precisely, is consistent with previous measurements. The values of the slope parameter $B$ and the relative real amplitude ratio $\rho$ determined in this experiment alleviate the lack of data in the relevant energy region. This precise data on $\rho$ might be an important check for a new dispersion analysis.

   nucl-exPLB(2021)·8 citations
2. 02*

   Flavour and Energy Dependence of Chemical Freeze-out Temperatures in Relativistic Heavy Ion Collisions from RHIC-BES to LHC Energies

   Fernando Antonio Flor🇺🇸 · Gabrielle Olinger🇺🇸 · Rene Bellwied🇺🇸

   We present calculations of the chemical freeze-out temperature (T_ch) based on particle yields from STAR and ALICE measured at collision energies ranging from sqrt{s_{NN}} = 11.5 GeV to 5.02 TeV. Employing the Grand Canonical Ensemble approach using the Thermal-FIST Hadron Resonance Gas model package, we show evidence for a flavour-dependent chemical freeze-out in the crossover region of the QCD phase diagram. At a vanishing baryochemical potential, we calculate light and strange flavour freeze-out temperatures T_L = 150.2 +- 2.6 MeV and T_S = 165.1 +- 2.7 MeV, respectively.

   nucl-exhep-exhep-phnucl-thPLB(2021)·38 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.