Mon·Aug 14, 2023Monday·August 14, 2023

1. 01*

   Probing nuclear structure using elliptic flow of strange and multi-strange hadrons in isobar collisions

   Priyanshi Sinha (for the STAR Collaboration)🇮🇳

   Isobar collisions, ${}_{44}^{96}$Ru+${}_{44}^{96}$Ru and ${}_{40}^{96}$Zr+${}_{40}^{96}$Zr, at $\sqrt{s_{\mathrm{NN}}}$ = 200 GeV have been performed at RHIC in order to study the charge separation along the magnetic field, called the Chiral Magnetic Effect (CME). The difference in nuclear deformation and structure between the two isobar nuclei may result in a difference in the flow magnitudes. Hence, elliptic flow measurements for these collisions give direct information about the initial state anisotropies. Strange and multi-strange hadrons have a small hadronic cross-section compared to light hadrons, making them an excellent probe for understanding the initial state anisotropies of the medium produced in these isobar collisions. The collected datasets include approximately two billion events for each of the isobar species and provide a unique opportunity for statistics hungry measurements. In this proceeding, we will report the elliptic flow ($v_2$) measurement of $K_s^0$, $\Lambda$, $\overline{\Lambda }$, $\varphi$, ${\Xi }^{-}$, ${\overline{\Xi }}^{+}$, ${\Omega }^{-}$, and ${\overline{\Omega }}^{+}$ at mid-rapidity for Ru+Ru and Zr+Zr collisions at $\sqrt{s_{\mathrm{NN}}}$ = 200 GeV. The centrality and transverse momentum ($p_T$) dependence of $v_2$ of (multi-)strange hadrons will be shown. System size dependence of $v_2$ will be shown by comparing the $v_2$ results obtained from Cu+Cu, Au+Au, and U+U collisions. The number of constituent quark (NCQ) scaling for these strange hadrons will also be tested. We will also compare the $p_T$-integrated $v_2$ for these two isobar collisions. Transport model calculations will be compared to data to provide further quantitative constraints on the nuclear structure.

   nucl-exhep-exSpringer Proc.Phys.(2024)·0 citations
2. 02*

   Characterizing nuclear modification effects in high-energy O-O collisions at energies available at the CERN Large Hadron Collider: A transport model perspective

   Debadatta Behera🇮🇳 · Suman Deb🇫🇷 · Captain R. Singh🇮🇳 · Raghunath Sahoo🇮🇳

   The present work focuses on Oxygen-Oxygen (O-O) collisions, which are planned at the CERN Large Hadron Collider. Oxygen, being a doubly magic number nucleus, has some very unique features. This study attempts to probe the exotic state of QCD matter in O-O collisions. Additionally, the role of different nuclear density profiles in governing the final state dynamics in ultra-relativistic nuclear collisions is also explored. Using a multi-phase transport model, we obtain the nuclear modification factor (${\text{R}}_{\text{AA}}$) for all charged hadrons and identified particles for O-O collisions at $\sqrt{s_{\mathrm{NN}}}$ = 7 TeV. Furthermore, we investigate the behavior of ${\text{R}}_{\text{AA}}$ as a function of transverse momentum (${\text{p}}_{\mathrm{T}}$) for three centralities (most central, mid-central, and peripheral) considering both $\alpha$-cluster and Woods-Saxon nuclear density profiles. We also extend this work to study the rapidity dependence of ${\text{R}}_{\text{AA}}$ for all charged hadrons. To better understand our findings of O-O collisions, the results are confronted with the available data of ${\text{R}}_{\text{AA}}$ for Pb-Pb collisions. The present study sheds light on particle production mechanisms, emphasizing factors influencing particle yield from pre-collision to post-collision stages in the context of O-O collisions.

   ↳ hep-phhep-exnucl-exnucl-thPRC(2024)·23 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.