Fri·Jul 22, 2022Friday·July 22, 2022

1. 01*

   Beauty production in heavy-ion collisions with ALICE at the LHC

   Xinye Peng (for the ALICE Collaboration)🇨🇳

   In this contribution, the final measurements of the centrality dependence of the nuclear modification factor ($R_{\mathrm{AA}}$) of non-prompt ${\mathrm{D}}^0$ in Pb--Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV will be presented. These measurements provide important constraints to the in-medium mass dependent of energy loss and hadronisation of the beauty quark. The $p_{\mathrm{T}}$-integrated non-prompt ${\mathrm{D}}^0$ $R_{\mathrm{AA}}$ will be presented for the first time and will be compared to the prompt ${\mathrm{D}}^0$ one. This comparison will shed light on possible different shadowing effects between charm and beauty quarks. In addition, the first measurements of non-prompt ${\mathrm{D}}_{\mathrm{s}}$ production in central and semi-central Pb--Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV will be discussed. The non-prompt ${\mathrm{D}}_{\mathrm{s}}$ measurements provide additional information on the production and hadronisation of ${\mathrm{B}}_{\mathrm{s}}$ mesons. Finally, the first measurement of non-prompt D-mesons elliptic flow in Pb--Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV will also be discussed. This measurement can constrain the degree of thermalisation of beauty quarks in the hot and dense QCD medium.

   nucl-ex1 citation
2. 02*

   Particle production as a function of underlying-event activity and search for jet-like modifications in pp, p-Pb, and Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with ALICE

   Antonio Ortiz (for the ALICE Collaboration)🇨🇭

   The similarity between small- and large-collision systems is explored using the charged-particle multiplicity in the transverse region, $N_{\mathrm{ch}}^{\mathrm{T}}$, which is sensitive to the underlying event. Measurements of charged-particle production as a function of $N_{\mathrm{ch}}^{\mathrm{T}}$ in pp, p-Pb and Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV in the toward, away and transverse regions are discussed. These three regions are defined relative to the track with the largest transverse momentum in the event ($p_{\mathrm{T}}^{\mathrm{trig}}$). The activity in the transverse region is subtracted from the activity in the toward and the away regions to search for jet-like modifications in small-collision systems. The jet-like signals are studied both as a function of $N_{\mathrm{ch}}^{\mathrm{T}}$ and $p_{\mathrm{T}}^{\mathrm{trig}}$. Results are compared with two general purpose Monte Carlo event generators: PYTHIA~8 and EPOS~LHC.

   nucl-exhep-exActa Phys.Polon.Supp.(2023)·0 citations
3. 03*

   Exclusive J/$\psi$ Detection and Physics with ECCE

   X. Li · J. K. Adkins · Y. Akiba · A. Albataineh · M. Amaryan · I. C. Arsene · C. Ayerbe Gayoso · J. Bae · X. Bai · M.D. Baker · M. Bashkanov · R. Bellwied and 275 other authors

   Exclusive heavy quarkonium photoproduction is one of the most popular processes in EIC, which has a large cross section and a simple final state. Due to the gluonic nature of the exchange Pomeron, this process can be related to the gluon distributions in the nucleus. The momentum transfer dependence of this process is sensitive to the interaction sites, which provides a powerful tool to probe the spatial distribution of gluons in the nucleus. Recently the problem of the origin of hadron mass has received lots of attention in determining the anomaly contribution $M_a$. The trace anomaly is sensitive to the gluon condensate, and exclusive production of quarkonia such as J/$\psi$ and ${\rm Y}$ can serve as a sensitive probe to constrain it. In this paper, we present the performance of the ECCE detector for exclusive J/$\psi$ detection and the capability of this process to investigate the above physics opportunities with ECCE.

   nucl-exphysics.ins-detNucl.Instrum.Meth.A(2023)·9 citations
4. 04*

   New results on the tetraneutron, seen in context

   Thomas Faestermann🇩🇪

   In a recent publication an experiment is described which searched for a resonance in the four-neutron system. In a convincing way the knockout of an $\alpha$-particle off ${}^8$He nuclei by protons has been measured and the missing mass of the remaining four neutrons has been calculated from the measured four-momenta of $\alpha$-particles and protons. The missing mass spectrum shows a bump of events corresponding to excitation of the four-neutron system to the continuum. In addition, there is a peak near zero missing mass that is convincingly interpreted as a resonance with excitation energy of the four neutrons E*= 2.37(58) MeV and a width of a Breit-Wigner distribution of $\Gamma$=1.75(37) MeV. Unfortunately, in the Duer et al. publication no reference has been made to our paper which had appeared six months earlier, but after the submission of their manuscript to Nature. At least, the corresponding News and Views article should have mentioned our measurement, since that was presumably written after acceptance of the Duer et al. paper. Here, I try to see both results together.

   nucl-ex2 citations
5. 05*

   Pseudorapidity Window Size Dependence of Multiplicity Fluctuations in High-Energy Collisions with System Size and Beam Energies

   Ashwini Kumar🇮🇳 · Gauri Devi🇮🇳 · B. K. Singh🇮🇳 · Bushra Ali🇮🇳 · Shakeel Ahmad🇮🇳

   An investigation of the critical behavior of strongly interacting QCD matter has been performed by analyzing fluctuation observables on event-by-event (ebe) basis measured in high-energy collision experiments. The fluctuation analysis is performed using nuclear interactions at different target sizes and at different colliding beam energies as a function of varying width of pseudorapidity interval. For the sake of comparison, event-by-event multiplicity fluctuations in hadronic and heavy-ion collisions (p-H, p-A and A-B) are studied within the framework of the Lund Monte Carlo based FRITIOF model. Charged particle multiplicity and the variance of the multiplicity distribution are estimated for the interactions involving different target sizes and beam momenta i.e., p-H, p-CNO, p-AgBr at 200A GeV/c and ${}^{16}$O-AgBr collisions at 14.6, 60 and 200A GeV/c. Further, multiplicity fluctuations are quantified in terms of intensive quantity, the scaled variances $\omega$ and the strongly intensive quantity ${\Sigma }_{FB}$ derived from the charged particle multiplicity and the width of the multiplicity distribution. Strongly intensive quantity ${\Sigma }_{FB}$ is a quantity of great significance to extract information about short and long-range multiplicity correlations. Furthermore, the collision centrality and centrality bin width dependent behavior of the multiplicity fluctuation have been examined in the framework of Lund Monte Carlo based FRITIOF model. Results based on the fluctuation analysis carried out in the present study are interpreted in terms of dynamics of collision process and the possibility of related QCD phase transition.

   nucl-exhep-phIJMPE(2022)·4 citations
6. 06*

   Triaxiality explored by an odd quasi-particle

   Weichuan Li · Mark A. Caprio🇺🇸 · Stefan Frauendorf🇺🇸

   The triaxiality of odd-mass nuclei is investigated by coupling a quasiparticle to an even-even core through the core-quasiparticle coupling model. Both soft and rigid triaxial cores are considered. The "soft core" is described by the collective model with rotation-vibrational motion, while the "rigid core" is described by the triaxial rotor model, which is a limiting case of the collective model with only rotational motion. We show that the presence of the odd quasiparticle modifies the collective quadrupole dynamics of the core to appear more "rigid".

   ↳ nucl-thnucl-ex5 citations
7. 07*

   First row CKM unitarity

   Chien-Yeah Seng🇩🇪

   In this talk I briefly review the precision test of the first row CKM unitarity, focusing mainly on $V_{ud}$ and $V_{us}$ extracted from pion, kaon, neutron and superallowed nuclear beta decays. I will discuss the current status of several important Standard Model theory inputs to these processes, and the need for future improvements.

   ↳ hep-phhep-exhep-latnucl-ex+13 citations
8. 08*

   Open Heavy Flavor Studies for the ECCE Detector at the Electron Ion Collider

   X. Li · J. K. Adkins · Y. Akiba · A. Albataineh · M. Amaryan · I. C. Arsene · C. Ayerbe Gayoso · J. Bae · X. Bai · M.D. Baker · M. Bashkanov · R. Bellwied and 275 other authors

   The ECCE detector has been recommended as the selected reference detector for the future Electron-Ion Collider (EIC). A series of simulation studies have been carried out to validate the physics feasibility of the ECCE detector. In this paper, detailed studies of heavy flavor hadron and jet reconstruction and physics projections with the ECCE detector performance and different magnet options will be presented. The ECCE detector has enabled precise EIC heavy flavor hadron and jet measurements with a broad kinematic coverage. These proposed heavy flavor measurements will help systematically study the hadronization process in vacuum and nuclear medium especially in the underexplored kinematic region.

   ↳ physics.ins-dethep-exnucl-ex4 citations
9. 09*

   Snowmass 2021 Scintillating Bubble Chambers: Liquid-noble Bubble Chambers for Dark Matter and CE$\nu$NS Detection

   E. Alfonso-Pita🇲🇽 · M. Baker🇨🇦 · E. Behnke🇺🇸 · A. Brandon · M. Bressler🇺🇸 · B. Broerman🇨🇦 · K. Clark🇨🇦 · R. Coppejans🇺🇸 · J. Corbett🇨🇦 · C. Cripe🇺🇸 · M. Crisler🇺🇸 · C.E. Dahl🇺🇸 and 33 other authors

   The Scintillating Bubble Chamber (SBC) Collaboration is developing liquid-noble bubble chambers for the quasi-background-free detection of low-mass (GeV-scale) dark matter and coherent scattering of low-energy (MeV-scale) neutrinos (CE$\nu$NS). The first physics-scale demonstrator of this technique, a 10-kg liquid argon bubble chamber dubbed SBC-LAr10, is now being commissioned at Fermilab. This device will calibrate the background discrimination power and sensitivity of superheated argon to nuclear recoils at energies down to 100 eV. A second functionally-identical detector with a focus on radiopure construction is being built for SBC's first dark matter search at SNOLAB. The projected spin-independent sensitivity of this search is approximately $10^{-43}$ cm${}^2$ at 1 GeV$/c^2$ dark matter particle mass. The scalability and background discrimination power of the liquid-noble bubble chamber make this technique a compelling candidate for future dark matter searches to the solar neutrino fog at 1 GeV$/c^2$ particle mass (requiring a $\sim$ton-year exposure with non-neutrino backgrounds sub-dominant to the solar CE$\nu$NS signal) and for high-statistics CE$\nu$NS studies at nuclear reactors.

   ↳ physics.ins-detastro-ph.IMhep-exnucl-ex29 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.