Fri·Jun 25, 2021Friday·June 25, 2021

1. 01*

   Production of K${}^{\ast }(892{)}^0$ and $\varphi (1020)$ in pp and Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV

   ALICE Collaboration

   The production of K${}^{\ast }(892{)}^0$ and $\varphi (1020)$ mesons in proton-proton (pp) and lead-lead (Pb-Pb) collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV has been measured using the ALICE detector at the Large Hadron Collider (LHC). The transverse momentum ($p_{\mathrm{T}}$) distributions of K${}^{\ast }(892{)}^0$ and $\varphi (1020)$ mesons have been measured at midrapidity $(|y|<0.5)$ up to $p_{\mathrm{T}}=20$ GeV$/c$ in inelastic pp collisions and for several Pb-Pb collision centralities. The collision centrality and collision energy dependence of the average transverse momenta agree with the radial flow scenario observed with stable hadrons, showing that the effect is stronger for more central collisions and higher collision energies. The ${\mathrm{K}}^{\ast 0}/K$ ratio is found to be suppressed in Pb-Pb collisions relative to pp collisions: this indicates a loss of the measured K${}^{\ast }(892{)}^0$ signal due to rescattering of its decay products in the hadronic phase. In contrast, for the longer-lived $\varphi (1020)$ mesons, no such suppression is observed. The nuclear modification factors ($R_{\mathrm{AA}}$) of K${}^{\ast }(892{)}^0$ and $\varphi (1020)$ mesons are calculated using pp reference spectra at the same collision energy. In central Pb-Pb collisions for $p_{\mathrm{T}}>8$ GeV$/c$, the $R_{\mathrm{AA}}$ values of K${}^{\ast }(892{)}^0$ and $\varphi (1020)$ are below unity and observed to be similar to those of pions, kaons, and (anti)protons. The $R_{\mathrm{AA}}$ values at high $p_{\mathrm{T}}$ ($>$~8 GeV$/c$) for K${}^{\ast }(892{)}^0$ and $\varphi (1020)$ mesons are in agreement within uncertainties for $\sqrt{s_{\mathrm{NN}}}=5.02$ and 2.76 TeV.

   nucl-exhep-exPRC(2022)·72 citations
2. 02*

   Electroweak Physics: Summary

   Rupa Chatterjee🇮🇳

   Electroweak probes are potential tool to study the properties of the hot and dense strongly interacting matter produced in relativistic nuclear collisions due to their unique nature. A selection of the new experimental analysis and results from theory calculations on electromagnetic and weak probes presented at the Hard Probes 2020 are discussed in this contribution.

   ↳ nucl-thnucl-exPoS(2021)·3 citations
3. 03*

   The Notre-Dame Cube: An active-target time-projection chamber for radioactive beam experiments and detector development

   T. Ahn · J. S. Randhawa · S. Aguilar · D. Blankstein · L. Delgado · N. Dixneuf · S. L. Henderson · W. Jackson · L. Jensen🇨🇭 · S. Jin🇨🇳 · J. Koci · J. J. Kolata and 11 other authors

   Active-target detectors have the potential to address the difficulties associated with the low intensities of radioactive beams. We have developed an active-target detector, the Notre Dame Cube (ND-Cube), to perform experiments with radioactive beams produced at $TwinSol$ and to aid in the development of active-target techniques. Various aspects of the ND-Cube and its design were characterized. The ND-Cube was commissioned with a ${}^7$Li beam for measuring ${}^{40}$Ar + ${}^7$Li fusion reaction cross sections and investigating ${}^7$Li($\alpha$,$\alpha$)${}^7$Li scattering events. The ND-Cube will be used to study a range of reactions using light radioactive ions produced at low energy.

   ↳ physics.ins-detnucl-exNucl.Instrum.Meth.A(2022)·7 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.