Fri·May 31, 2024Friday·May 31, 2024

1. 01*

   Measurement of the production and elliptic flow of (anti)nuclei in Xe-Xe collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.44 TeV

   ALICE Collaboration

   Measurements of (anti)deuteron and (anti)${}^3$He production in the rapidity range $|y|<$ 0.5 as a function of the transverse momentum and event multiplicity in Xe$-$Xe collisions at a center-of-mass energy per nucleon$-$nucleon pair of $\sqrt{s_{\mathrm{NN}}}$ = 5.44 TeV are presented. The coalescence parameters $B_2$ and $B_3$ are measured as a function of the transverse momentum per nucleon. The ratios between (anti)deuteron and (anti)${}^3$He yields and those of (anti)protons and pions are reported as a function of the mean charged-particle multiplicity density, and compared with two implementations of the statistical hadronization model and with coalescence predictions. The elliptic flow of (anti)deuterons is measured for the first time in Xe$-$Xe collisions and shows features similar to those already observed in Pb$-$Pb collisions, i.e., the mass ordering at low transverse momentum and the meson$-$baryon grouping at intermediate transverse momentum. The production of nuclei is particularly sensitive to the chemical freeze-out temperature of the system created in the collision, which is extracted from a grand-canonical-ensemble-based thermal fit, performed for the first time including light nuclei along with light-flavor hadrons in Xe$-$Xe collisions. The extracted chemical freeze-out temperature $T_{\mathrm{chem}}$ = (154.2 $\pm$ 1.1) MeV in Xe$-$Xe collisions is similar to that observed in Pb$-$Pb collisions and close to the crossover temperature predicted by lattice quantum chromodynamics calculations.

   nucl-exhep-exPRC(2024)·10 citations
2. 02*

   Measurement of ${}_{\Lambda }^3\mathrm{H}$ production in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV

   ALICE Collaboration

   The first measurement of ${}_{\Lambda }^3\mathrm{H}$ and ${}_{\overline{\Lambda }}^3\overline{\mathrm{H}}$ differential production with respect to transverse momentum and centrality in Pb$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$~TeV is presented. The ${}_{\Lambda }^3\mathrm{H}$ has been reconstructed via its two-charged-body decay channel, i.e., ${}_{\Lambda }^3\mathrm{H}\to {}^3\mathrm{He}+{\pi }^{-}$. A Blast-Wave model fit of the $p_{\mathrm{T}}$-differential spectra of all nuclear species measured by the ALICE collaboration suggests that the ${}_{\Lambda }^3\mathrm{H}$ kinetic freeze-out surface is consistent with that of other nuclei. The ratio between the integrated yields of ${}_{\Lambda }^3\mathrm{H}$ and ${}^3\mathrm{He}$ is compared to predictions from the statistical hadronisation model and the coalescence model, with the latter being favoured by the presented measurements.

   nucl-exhep-exPLB(2025)·15 citations
3. 03*

   Investigating $\Lambda$ baryon production in p-Pb collisions in jets and the underlying event using angular correlations

   ALICE Collaboration

   First measurements of hadron(h)$-\Lambda$ azimuthal angular correlations in p$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV using the ALICE detector at the Large Hadron Collider are presented. These correlations are used to separate the production of associated $\Lambda$ baryons into three different kinematic regions, namely those produced in the direction of the trigger particle (near-side), those produced in the opposite direction (away-side), and those whose production is uncorrelated with the jet axis (underlying event). The per-trigger associated $\Lambda$ yields in these regions are extracted, along with the near- and away-side azimuthal peak widths, and the results are studied as a function of associated particle $p_{\mathrm{T}}$ and event multiplicity. Comparisons with the DPMJET event generator and previous measurements of the $\varphi (1020)$ meson are also made. The final results indicate that strangeness production in the highest multiplicity p$-$Pb collisions is enhanced relative to low multiplicity collisions in both the jet-like regions and the underlying event. The production of $\Lambda$ relative to charged hadrons is also enhanced in the underlying event when compared to the jet-like regions. Additionally, the results hint that strange quark production in the away-side of the jet is modified by soft interactions with the underlying event.

   nucl-exhep-exPRC(2025)·4 citations
4. 04*

   Probing strangeness hadronization with event-by-event production of multistrange hadrons

   ALICE Collaboration

   This Letter presents the first measurement of event-by-event fluctuations of the net number (difference between the particle and antiparticle multiplicities) of multistrange hadrons ${\Xi }^{-}$ and ${\overline{\Xi }}^{+}$ and its correlation with the net-kaon number using the data collected by the ALICE Collaboration in pp, p$-$Pb, and Pb$-$Pb collisions at a center-of-mass energy per nucleon pair $\sqrt{s_{\mathrm{NN}}}=5.02\mathrm{TeV}$. The statistical hadronization model with a correlation over three units of rapidity between hadrons having the same and opposite strangeness content successfully describes the results. On the other hand, string-fragmentation models that mainly correlate strange hadrons with opposite strange quark content over a small rapidity range fail to describe the data.

   nucl-exhep-exPRL(2025)·15 citations
5. 05*

   Hyperon-Nucleus/Nucleon Scattering at BESIII

   Han Miao🇨🇳 · Jianyu Zhang🇨🇳

   Utilizing the large quantity of hyperons and antihyperons produced by the decay of 10 billion $J/\psi$ and 2.7 billion $\psi (3686)$ collected at BESIII, the cross sections of several specific elastic or inelastic (anti-)hyperon-nucleus/nucleon rections have been measured via the scattering between the (anti-)hyperons and the nucleus in the dense objects of BESIII detector. The novel method developed in these works extends the research field and opens a new era for the experiments at $e^{+}{e}^{-}$ colliders. The results of such measurements will definitely benefit a lot the precise probe of the (anti-)hyperon-nucleus/nucleon interactions and provide constraints for the studies of the potential of strong interaction, the origin of color confinement, the unified model for baryon-baryon interactions, and the internal structure of neutron stars. The desirable prospects of corresponding studies in the future Super Tau-Charm Factory (STCF) are also discussed in this report.

   nucl-exnucl-thInt.J.Mod.Phys.A(2024)·0 citations
6. 06*

   Initial measurement of reactor antineutrino oscillation at SNO+

   SNO+ Collaboration: A. Allega · M. R. Anderson · S. Andringa · M. Askins · D. M. Asner · D. J. Auty · A. Bacon · J. Baker · F. Barão · N. Barros · R. Bayes · E. W. Beier and 108 other authors

   The SNO+ collaboration reports its first spectral analysis of long-baseline reactor antineutrino oscillation using 114 tonne-years of data. Fitting the neutrino oscillation probability to the observed energy spectrum yields constraints on the neutrino mass-squared difference $\Delta m_{21}^2$. In the ranges allowed by previous measurements, the best-fit $\Delta m_{21}^2$ is (8.85${}_{-1.33}^{+1.10}$) $\times$ 10${}^{-5}$ eV${}^2$. This measurement is continuing in the next phases of SNO+ and is expected to surpass the present global precision on $\Delta m_{21}^2$ with about three years of data.

   ↳ hep-exnucl-exEPJC(2025)·20 citations
7. 07*

   Anisotropic flow in fixed-target ${}^{208}$Pb+${}^{20}$Ne collisions as a probe of quark-gluon plasma

   Giuliano Giacalone🇩🇪 · Wenbin Zhao🇺🇸 · Benjamin Bally🇫🇷 · Shihang Shen🇩🇪 · Thomas Duguet🇫🇷 · Jean-Paul Ebran🇫🇷 · Serdar Elhatisari🇹🇷 · Mikael Frosini🇫🇷 · Timo A. Lähde🇩🇪 · Dean Lee🇺🇸 · Bing-Nan Lu🇨🇳 · Yuan-Zhuo Ma🇺🇸 and 10 other authors

   The System for Measuring Overlap with Gas (SMOG2) at the LHCb detector enables the study of fixed-target ion-ion collisions at relativistic energies ($\sqrt{s_{\mathrm{NN}}}\sim 100$ GeV in the centre-of-mass). With input from \textit{ab initio} calculations of the structure of ${}^{16}$O and ${}^{20}$Ne, we compute 3+1D hydrodynamic predictions for the anisotropic flow of Pb+Ne and Pb+O collisions, to be tested with upcoming LHCb data. This will allow the detailed study of quark-gluon plasma (QGP) formation as well as experimental tests of the predicted nuclear shapes. Elliptic flow ($v_2$) in Pb+Ne collisions is greatly enhanced compared to the Pb+O baseline due to the shape of ${}^{20}$Ne, which is deformed in a bowling-pin geometry. Owing to the large ${}^{208}$Pb radius, this effect is seen in a broad centrality range, a unique feature of this collision configuration. Larger elliptic flow further enhances the quadrangular flow ($v_4$) of Pb+Ne collisions via non-linear coupling, and impacts the sign of the kurtosis of the elliptic flow vector distribution ($c_2\{4\}$). Exploiting the shape of ${}^{20}$Ne proves thus an ideal method to investigate the formation of QGP in fixed-target experiments at LHCb, and demonstrates the power of SMOG2 as a tool to image nuclear ground states.

   ↳ nucl-thhep-phnucl-exPRL(2025)·64 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.