Wed·Dec 28, 2022Wednesday·December 28, 2022

1. 01*

   Open and hidden heavy flavor measurements at RHIC

   Leszek Kosarzewski (Czech Technical University in Prague)🇨🇿

   Quarks of heavy flavors are useful tool to study quark-gluon plasma created in heavy-ion collisions. Due to their high mass and early production time, heavy quarks experience the entire evolution of the system created in these collisions. Open heavy flavor meson measurements are sensitive to the energy loss in the QGP, while quarkonia are sensitive to the temperature of the QGP as they dissociate because of Debye-like screening of color charges. This presentation is a summary of the latest heavy flavor studies performed at RHIC. Results from both STAR and PHENIX experiments are presented, compared to theoretical calculations and the implications discussed.

   nucl-exEPJ Web Conf.(2022)·0 citations
2. 02*

   On nuclear short-range correlations and the zero-energy eigenstates of the Schrodinger equation

   Saar Beck🇩🇪 · Ronen Weiss🇺🇸 · Nir Barnea🇮🇱

   We present a systematic analysis of the nuclear 2 and 3-body short range correlations, and their relations to the zero-energy eigenstates of the Schrodinger equation. To this end we analyze the doublet and triplet Coupled-Cluster amplitudes in the high momentum limit, and show that they obey universal equations independent of the number of nucleons and their state. Furthermore, we find that these Coupled-Cluster amplitudes coincide with the zero-energy Bloch-Horowitz operator. These results illuminate the relations between the nuclear many-body theory and the generalized contact formalism, introduced to describe the nuclear 2-body short range correlations, and it might also be helpful for general Coupled-Cluster computations as the asymptotic part of the amplitudes is given and shown to be universal.

   ↳ nucl-thnucl-exPRC(2023)·5 citations
3. 03*

   Angular Dependence of the Polarization Transfer to the Proton in the $e\vec{p}\to e\vec{p}$ Process

   M.V. Galynskii🇧🇾

   The dependence of the longitudinal polarization transfer to the proton in the $e\vec{p}\to e\vec{p}$ process on the proton scattering angle has been numerically analyzed for the case where the initial (at rest) proton is partially polarized along the direction of motion of the detected recoil proton. The analysis is based on the results of JLab polarization experiments on measuring the ratio of the Sachs form factors in the $\vec{e}p\to e\vec{p}$ process using the Kelly (2004) and Qattan (2015) parameterizations for their ratio, in the kinematics of the SANE Collaboration experiment (2020) on measuring the double spin asymmetry in the $\vec{e}\vec{p}\to ep$ process. It is shown that the violation of the scaling of the Sachs form factors leads to a significant increase in the magnitude of the polarization transfer to the proton in comparison with the case of dipole dependence.

   ↳ hep-phnucl-exJETP Lett.(2022)·2 citations
4. 04*

   A CsI hodoscope on CSHINE for Bremsstrahlung {\gamma}-rays in Heavy Ion Reactions

   Yuhao Qin · Dong Guo · Sheng Xiao · Yijie Wang · Fenhai Guan · Xinyue Diao · Zhi Qin · Dawei Si · Boyuan Zhang · Yaopeng Zhang · Xianglun Wei · Herun Yang and 13 other authors

   Bremsstrahlung $\gamma$ production in heavy ion reactions at Fermi energies carries important physical information including the nuclear symmetry energy at supra-saturation densities. In order to detect the high energy Bremsstrahlung $\gamma$ rays, a hodoscope consisting of 15 CsI(Tl) crystal read out by photo multiplier tubes has been built, tested and operated in experiment. The resolution, efficiency and linear response of the units to $\gamma$ rays have been studied using radioactive source and $(\mathrm{p},\gamma )$ reactions. The inherent energy resolution of $1.6\%+2\%/E_{\gamma }^{1/2}$ is obtained. Reconstruction method has been established through Geant 4 simulations, reproducing the experimental results where comparison can be made. Using the reconstruction method developed, the whole efficiency of the hodoscope is about $2.6\times 10^{-4}$ against the $4\pi$ emissions at the target position, exhibiting insignificant dependence on the energy of incident $\gamma$ rays above 20 MeV. The hodoscope is operated in the experiment of ${}^{86}$Kr + ${}^{124}$Sn at 25 MeV/u, and a full $\gamma$ energy spectrum up to 80 MeV has been obtained.

   ↳ physics.ins-dethep-exnucl-exNucl.Instrum.Meth.A(2023)·11 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.