Tue·Mar 26, 2024Tuesday·March 26, 2024

1. 01*

   Exotic tetraquarks at the HL-LHC with JETHAD: A high-energy viewpoint

   Francesco Giovanni Celiberto🇪🇸

   We review the semi-inclusive hadroproduction of a neutral hidden-flavor tetraquark with light and heavy quark flavor at the HL-LHC, accompanied by another heavy hadron or a light-flavored jet. We make use of the novel TQHL1.0 determinations of leading-twist fragmentation functions to describe the formation mechanism of a tetraquark state within the next-to-leading order perturbative QCD. This framework builds on the basis of a spin-physics inspired model, taken as a proxy for the lowest-scale input of the constituent heavy-quark fragmentation channel. Then, all parton-to-tetraquark fragmentation functions are consistently obtained via the above-threshold DGLAP evolution in a variable-flavor number scheme. We provide predictions for a series of differential distributions calculated by the hands of the JETHAD method well-adapted to NLL/NLO+ hybrid-factorization studies, where the resummation of next-to-leading energy logarithms and beyond is included in the collinear picture. We provide corroborating evidence that high-energy observables sensitive to semi-inclusive tetraquark emissions at the HL-LHC exhibit a fair stability under radiative corrections as well as MHOU studies. Our analysis constitutes a prime contact point between QCD resummations and the exotic matter.

   ↳ hep-phhep-exhep-thnucl-ex+1Symmetry(2024)·29 citations
2. 02*

   Heaven and Earth: Nuclear Astrophysics after GW170817

   J. Piekarewicz🇺🇸

   The historical detection of gravitational waves from the binary neutron star merger GW170817 is providing fundamental new insights into the astrophysical site for the creation of the heaviest elements in the cosmos and on the equation of state of neutron-rich matter. Shortly after this historical detection, electromagnetic observations of neutron stars together with measurements of the properties of neutron-rich nuclei at terrestrial facilities have placed additional constraints on the dynamics of neutron-rich matter. It is this unique synergy between heaven and earth that is the focus of this article.

   ↳ nucl-thastro-ph.SRnucl-exEPJ Web Conf.(2024)·2 citations
3. 03*

   Unveiling the underlying structure of axial-vector bottom-charm tetraquarks in the light of their magnetic moments

   U. Özdem🇹🇷

   The magnetic moment yields an excellent framework to explore the inner structure of particles determined by the quark-gluon dynamics of QCD, as it is the leading-order response of a bound system to a weak external magnetic field. Motivated by this, in this study, the magnetic moments of possible axial-vector $T_{bc\bar{u}\bar{u}}$, $T_{bc\bar{d}\bar{d}}$, and $T_{bc\bar{u}\bar{d}}$ tetraquarks are obtained with the help of light-cone QCD sum rules. For this purpose, we assume that these states are represented as a diquark-antidiquark picture with different structures and interpolating currents. The magnetic moment results derived using different diquark-antidiquark configurations differ substantially from each other. This can be translated into more than one tetraquark state with the same quantum number and quark content yet possessing different magnetic moments. From the numerical results obtained, we have concluded that the magnetic moments of the $T_{bc}$ states can project their inner structure, which can be used for their quantum numbers and quark-gluon organization. The contribution of individual quarks to the magnetic moments is also analyzed for completeness. We hope that our predictions of the magnetic moments of the $T_{bc}$ tetraquarks, together with the results of other theoretical investigations of the spectroscopic parameters and decay widths of these interesting tetraquarks, may be valuable in the search for these states in future experiments and in unraveling the internal structure of these tetraquarks.

   ↳ hep-phhep-exnucl-exJHEP(2024)·14 citations
4. 04*

   Effect of Light Nuclei on Chemical Freeze-out Parameters at RHIC Energies

   Ning Yu · Zuman Zhang · Hongge Xu · Minxuan Song

   In this study, the chemical freeze-out of hadrons, including light-and strange-flavor particles and light nuclei, produced in Au+Au collisions at the Relativistic Heavy Ion Collider (RHIC), was investigated. Using the thermal-FIST thermodynamic statistical model, we analyzed various particle sets: those inclusive of light nuclei, those exclusive to light nuclei, and those solely comprising light nuclei. We determined the chemical freeze-out parameters at $\sqrt{s_{\text{NN}}}=$ 7.7--200 GeV and four different centralities. A significant finding was the decrease in the chemical freeze-out temperature $T_{\text{ch}}$ with light nuclei inclusion, with an even more pronounced reduction when considering light nuclei yields exclusively. This suggests that light nuclei formation occurs at a later stage in the system's evolution at RHIC energies. We present parameterized formulas that describe the energy dependence of $T_{\text{ch}}$ and the baryon chemical potential ${\mu }_B$ for three distinct particle sets in central Au+Au collisions at RHIC energies. Our results reveal at least three distinct $T_{\text{ch}}$ at RHIC energies correspond to different freeze-out hypersurfaces: a light-flavor freeze-out temperature of $T_L$ = 150.2$\pm$6 MeV, a strange-flavor freeze-out temperature $T_s$ = 165.1$\pm$2.7 MeV, and a light-nuclei freeze-out temperature $T_{\text{ln}}$ = 141.7$\pm$1.4 MeV. Notably, at the Large Hadron Collider (LHC) Pb+Pb 2.76 TeV, the expected lower freeze-out temperature for light nuclei was not observed; instead, the $T_{\text{ch}}$ for light nuclei was found to be approximately 10 MeV higher than that for light-flavor hadrons.

   ↳ nucl-thhep-phnucl-exNucl.Sci.Tech.(2025)·3 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.