Wed·Aug 3, 2022Wednesday·August 3, 2022

1. 01*

   Measurement of charged-particle jet properties in p--Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with ALICE

   Prottoy Das (for the ALICE Collaboration)🇮🇳

   We present the measurement of charged-particle jet properties in minimum bias p--Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV in ALICE. Jets are reconstructed from charged particles at midrapidity using the anti-$k_{\mathrm{T}}$ jet finding algorithm with jet resolution parameter $R$ = 0.4. The mean charged particle multiplicity and jet fragmentation function for leading charged-particle jets in the $p_{\mathrm{T}}$ interval 10 $<p_{\mathrm{T},\mathrm{jet}}^{\mathrm{ch}}<$ 100 GeV/$c$ are measured and compared with theoretical model predictions.

   nucl-exhep-ex3 citations
2. 02*

   Directed flow of $\Lambda$ in high-energy heavy-ion collisions and $\Lambda$ potential in dense nuclear matter

   Yasushi Nara🇯🇵 · Asanosuke Jinno🇯🇵 · Koichi Murase🇯🇵 · Akira Ohnishi🇯🇵

   We investigate the sensitivity of the $\Lambda$ directed flow to the $\Lambda$ potential in mid-central Au + Au collisions at $\sqrt{s_{NN}}\approx 3.0$--$30$ GeV. The $\Lambda$ potential obtained from the chiral effective field theory ($\chi$EFT) is used in a microscopic transport model, a vector version of relativistic quantum molecular dynamics (RQMDv). We find that the density-dependent $\Lambda$ potentials, obtained from the $\chi$EFT assuming weak momentum dependence of the potential, reproduce the rapidity and the beam-energy dependence of the $\Lambda$ directed flow measured by the STAR collaboration in the Beam Energy Scan program. Although the $\Lambda$ directed flow is insensitive to the density dependence of the potential, it is susceptible to the momentum dependence. We also show that a hydrodynamics picture based on the blast-wave model predicts a similarity of the proton, $\Lambda$, and $\Xi$ directed flows, but the directed flow of $\Omega$ baryons slightly deviates from other baryons. We also show that the quark coalescence predicts different rapidity dependence of the directed flows for hyperons. These investigations suggest that measurements of a wide range of the rapidity dependence of the directed flow of hyperons may provide important information about the properties of hot and dense matter created in high-energy heavy-ion collisions.

   ↳ nucl-thhep-phnucl-exPRC(2022)·44 citations
3. 03*

   Dark matter search with the BDX-MINI experiment

   M. Battaglieri🇮🇹 · M. Bondì🇮🇹 · A. Celentano🇮🇹 · P.L. Cole🇺🇸 · M. De Napoli🇮🇹 · R. De Vita🇮🇹 · L. Marsicano🇮🇹 · N. Randazzo🇮🇹 · E.S. Smith🇺🇸 · D. Snowden-Ifft🇺🇸 · M. Spreafico🇮🇹 · M.H. Wood🇺🇸

   BDX-MINI is a beam dump experiment optimized to search for Light Dark Matter produced in the interaction of the intense CEBAF 2.176 GeV electron beam with the Hall A beam dump at Jefferson Lab. The BDX-MINI detector consists of a PbWO${}_4$ electromagnetic calorimeter surrounded by a hermetic veto system for background rejection. The experiment accumulated $2.56\times 10^{21}$ EOT in six months of running. Simulations of fermionic and scalar Dark Matter interactions with electrons of the active volume of the BDX-MINI detector were used to estimate the expected signal. Data collected during the beam-off time allowed us to characterize the background dominated by cosmic rays. A blind data analysis based on a maximum-likelihood approach was used to optimize the experiment sensitivity. An upper limit on the production of light dark matter was set using the combined event samples collected during beam-on and beam-off configurations. In some kinematics, this pilot experiment is sensitive to the parameter space covered by some of the most sensitive experiments to date, which demonstrates the discovery potential of the next generation beam dump experiment planned at intense electron beam facilities.

   ↳ hep-exnucl-exPRD(2022)·15 citations
4. 04*

   A Cryogenically-Cooled High-Sensitivity Nuclear Quadrupole Resonance Spectrometer

   Jarred Glickstein · Soumyajit Mandal🇮🇳

   The paper describes a radio frequency (RF) spectrometer for 14N nuclear quadrupole resonance (NQR) spectroscopy that uses a detector coil cooled to 77 K to maximize measurement sensitivity. The design uses a minimally-intrusive network of active duplexers and mechanical contact switches to realize a digitally reconfigurable series/parallel coil tuning network that allows transmit- and receive-mode performance to be independently optimized. The design is battery-powered and includes a mixed-signal embedded system to monitor and control secondary processes, thus enabling autonomous operation. Tests on an acetaminophen sample show that cooling both the detector and sample increases the signal-to-noise ratio (SNR) per scan by a factor of approximately 88 (in power units), in good agreement with theoretical predictions.

   ↳ physics.ins-detnucl-ex0 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.