Tue·Nov 26, 2024Tuesday·November 26, 2024

1. 01*

   Photoproduction of two charged pions off protons in the resonance region

   A.V. Sarantsev · E. Klempt · K.V. Nikonov · P. Achenbach · V.D. Burkert · V. Crede · V. Mokeev

   Photoproduction of charged pions pairs off protons is studied within the invariant masses of the final state hadrons from 1.6 to 2.4 GeV at the Thomas Jefferson National Accelerator Facility with the CLAS detector. The data are included in the Bonn-Gatchina coupled-channel analysis and provide the information necessary to determine the branching fractions for most known nucleon and Delta resonances. Branching ratios are obtained here from an event based likelihood fit.

   nucl-exPRC(2025)·5 citations
2. 02*

   In-beam $\gamma$-ray spectroscopy of negative-parity states of ${}^{37}$K populated in dissipative reactions

   T. Beck · A. Gade🇺🇸 · B. A. Brown🇺🇸 · D. Weisshaar🇺🇸 · D. Bazin🇺🇸 · K. W. Brown🇺🇸 · R. J. Charity🇺🇸 · P. J. Farris · S. A. Gillespie🇨🇦 · A. M. Hill · J. Li🇨🇳 · B. Longfellow🇺🇸 · W. Reviol🇺🇸 · D. Rhodes🇨🇦

   In-beam $\gamma$-ray spectroscopy was used to study excited states of the neutron-deficient nucleus ${}^{37}$K populated in fast-beam inelastic-scattering and proton-removal reactions at high-momentum loss. New $\gamma$-ray transitions and $\gamma \gamma$ coincidence relationships were established using the $\gamma$-ray tracking array GRETINA. The extension of the level scheme up to the first $(13/2^{-})$ state highlights the potential of this recently demonstrated population pathway for studies of isospin symmetry involving mirror-energy differences. The nature of the newly identified states is discussed in comparison to shell-model calculations with the FSU cross-shell effective interaction. The calculated occupation numbers of individual orbitals are shown to offer a consistent explanation of the measured mirror-energy differences between ${}^{37}$K and ${}^{37}$Ar.

   nucl-exPRC(2024)·3 citations
3. 03*

   Measurements of quarkonia production

   L. Massacrier🇫🇷

   Quarkonium production in high-energy hadronic collisions is a useful tool to investigate fundamental aspects of Quantum Chromodynamics, from the proton and nucleus structure to deconfinement and the properties of the Quark Gluon Plasma (QGP). In these proceedings, emphasis is made on few recent quarkonium results from the RHIC and LHC colliders in proton-proton (pp), proton-nucleus (p-A) and nucleus-nucleus (A-A) collisions. In addition, results for some key observables are compiled to discuss the state-of-the-art in quarkonium production, with a focus on quarkonium hadroproduction.

   nucl-exhep-exEPJ Web Conf.(2025)·3 citations
4. 04*

   Kaon Distribution Functions from Empirical Information

   Zhen-Ni Xu🇨🇳 · Daniele Binosi🇮🇹 · Chen Chen🇨🇳 · Khépani Raya🇨🇳 · Craig D. Roberts🇨🇳 · José Rodríguez-Quintero🇪🇸

   Using available information from Drell-Yan data on pion and kaon structure functions, an approach is described which enables the development of pointwise profiles for all pion and kaon parton distribution functions (DFs) without reference to theories of hadron structure. The key steps are construction of structure-function-constrained probability-weighted ensembles of valence DF replicas and use of an evolution scheme for parton DFs that is all-orders exact. The DFs obtained express qualitatively sound features of light-meson structure, e.g., the effects of Higgs boson couplings into QCD and the size of heavy-quark momentum fractions in light hadrons. In order to improve the results, additional and more precise data on the $u$-quark-in-kaon, $u^K$, to $u$-quark-in-pion, $u^{\pi }$, DF ratio would be necessary. Of greater value would be extraction of $u^K$ alone, thereby avoiding inference from the ratio: currently, the data-based form of $u^K$ is materially influenced by results for $u^{\pi }$.

   ↳ hep-phhep-exhep-latnucl-ex+1PLB(2025)·15 citations
5. 05*

   Towards a parameter-free determination of critical exponents and chiral phase transition temperature in QCD

   Sabarnya Mitra🇩🇪 · Frithjof Karsch🇩🇪 · Sipaz Sharma🇩🇪

   In order to quantify the universal properties of the chiral phase transition in (2+1)-flavor QCD, we make use of an improved, renormalized order parameter for chiral symmetry breaking which is obtained as a suitable difference of the $2$-flavor light quark chiral condensate and its corresponding light quark susceptibility. Having no additive ultraviolet as well as multiplicative logarithmic divergences, we use ratios of this order parameter constructed from its values for two different light quark masses. We show that this facilitates determining in a parameter-independent manner, the chiral phase transition temperature $T_c$ and the associated critical exponent $\delta$ which, for sufficiently small values of the light quark masses, controls the quark mass dependence of the order parameter at $T_c$. We present first results of these calculations from our numerical analysis performed with staggered fermions on $N_{\tau }=8$ lattices.

   ↳ hep-lathep-phhep-thnucl-ex+1PoS(2025)·8 citations
6. 06*

   Robust correlation between binding energies and charge radii of mirror nuclei

   Y. Lei · N. A. Alam · Z. Z. Qin🇨🇳 · M. Bao · K. Y. Zhang🇨🇳 · C. Ma

   Using the charge density from the two-parameter Fermi model, a robust and nontrival correlation between binding energis and charge radii of mirror nuclei is newly proposed. This correlation enables simple yet reliable predictions of the nuclear mass and charge radius of proton-rich nuclei. The validity of these predictions is demonstrated by comparing the predicted binding energies and charge radii with experimental data and predictions from other models. All 197 predicted binding energies and 199 charge radii involved in the comparisons are tabulated in the Supplemental Materials of this paper. The noticeable discrepancies are attributed to the large asymmetry in charge densities of mirror nuclei, suggesting that the proposed correlation could be a sensitive probe for local structural anomaly, such as shell closure and proton halo. The difference in mass dependence of charge radii near the proton dripline compared to those along the $\beta$-stability line supports the validity of our prediction method.

   ↳ nucl-thnucl-exIJMPE(2025)·0 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.