Thu·Nov 10, 2022Thursday·November 10, 2022

1. 01*

   Towards the continuum limit of nucleon form factors at the physical point using lattice QCD

   Ryutaro Tsuji🇯🇵 · Yasumichi Aoki🇯🇵 · Ken-Ichi Ishikawa🇯🇵 · Yoshinobu Kuramashi🇯🇵 · Shoichi Sasaki🇯🇵 · Eigo Shintani🇯🇵 · Takeshi Yamazaki🇯🇵

   We present results for the axial charge and root-mean-square (RMS) radii of the nucleon obtained from 2+1 flavor lattice QCD at the physical point with a large spatial extent of about 10 fm. Our calculations are performed with the PACS10 gauge configurations generated by the PACS Collaboration with the six stout-smeared $O(a)$ improved Wilson-clover quark action and Iwasaki gauge action at $\beta$ = 1.82 and 2.00 corresponding to lattice spacings of 0.085 fm and 0.063 fm respectively. We first evaluate the value of $g_A/g_V$ , which is not renormalized in the continuum limit and thus ends up with the renormalized axial charge. Moreover, we also calculate the nucleon elastic form factors and determine three kinds of isovector RMS radii such as electric, magnetic and axial ones at the two lattice spacings. We finally discuss the discretization uncertainties on renormalized axial charge and isovector RMS radii towards the continuum limit.

   hep-latPoS(2023)·1 citation
2. 02*

   Triply charmed baryons mass decomposition from lattice QCD

   Jin-Bo Li🇨🇳 · Long-Cheng Gui🇨🇳 · Wei Sun🇨🇳 · Jian Liang🇨🇳 · Wen Qin🇨🇳

   We present the first calculation of the connected scalar matrix element and the momentum fraction of charm quark within the${\frac{3}{2}}^{+}$ and ${\frac{3}{2}}^{-}$triply charmed baryons on lattice QCD. The results are based on overlap valence fermions on two ensembles of $N_f=2+1$ domain wall fermion configurations with two lattice spacings. The corresponding sea quark pion masses are $300$ MeV and $278$ MeV. The separated contributions to the triply charmed baryon mass are derived through the decomposition of the QCD energy-momentum tensor. The contribution of the connected charm quark matrix element to the triply charmed baryon is about 3/2 times that of the charmonium. And it contributes almost 70% of the total mass. The mass splitting of ${\frac{3}{2}}^{+}$ and ${\frac{3}{2}}^{-}$triply charmed baryons is mainly from $⟨H_E⟩$ of the QCD energy-momentum tensor. A mass decomposition from the quark model is also studied for comparison.

   hep-lathep-exhep-phCPC(2025)·8 citations
3. 03*

   Constraints on hadron resonance gas interactions via first-principles Lattice QCD susceptibilities

   Jamie M. Karthein🇺🇸 · Volker Koch🇺🇸 · Claudia Ratti🇺🇸 · Volodymyr Vovchenko🇺🇸

   We investigate extensions of the Hadron Resonance Gas (HRG) Model beyond the ideal case by incorporating both attractive and repulsive interactions into the model. When considering additional states exceeding those measured with high confidence by the Particle Data Group, attractive corrections to the overall pressure in the HRG model are imposed. On the other hand, we also apply excluded-volume corrections, which ensure there is no overlap of baryons by turning on repulsive (anti)baryon-(anti)baryon interactions. We emphasize the complementary nature of these two extensions and identify combinations of conserved charge susceptibilities that allow us to constrain them separately. In particular, we find interesting ratios of susceptibilities that are sensitive to one correction and not the other. This allows us to constrain the excluded volume and particle spectrum effects separately. Analysis of the available lattice results suggests the presence of both the extra states in the baryon-strangeness sector and the repulsive baryonic interaction, with indications that hyperons have a smaller repulsive core than non-strange baryons. We note that these results are interesting for heavy-ion-collision systems at both the LHC and RHIC.

   ↳ nucl-thhep-lathep-phEPJ Web Conf.(2023)·1 citation

* 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.