Mon·Nov 29, 2021Monday·November 29, 2021

1. 01*

   Quark-gluon vertex with 2 flavours of O(a) improved Wilson fermions

   Ayse Kızılersü🇦🇺 · Orlando Oliveira🇵🇹 · Paulo Silva🇵🇹 · Jon-Ivar Skullerud🇮🇪 · André Sternbeck🇩🇪

   We study the Landau-gauge quark-gluon vertex with 2 flavours of O(a)improved Wilson fermions, for several lattice spacings and quark masses. In the limit of vanishing gluon momentum, we find that all nonzero form factors have a significant infrared strength, and that the leading form factor lambda_1, multiplying the tree-level vertex structure, is significantly enhanced in the infrared compared to the quenched case. We find that all form factors are further enhanced in the infrared as the chiral and continuum limits are approached.

   hep-lathep-phPoS(2022)·6 citations
2. 02*

   An Euclidean representation of Majorana spins

   Jacek Wosiek🇵🇱

   An Euclidean representation of bosonized Majorana fermions, prior to imposing constraints, is derived in three space-time dimensons. The difference with the standard three dimensional Ising system is epmhasized. The mild sign problem, does not preclude Monte Carlo simulations in intermediate volumes. Implementing constraints is briefly outlined.

   hep-latPoS(2022)·0 citations
3. 03*

   Nucleon Charges and Sigma Terms from $N_f=2+1$ QCD

   Daniel Jenkins🇩🇪 · Sara Collins🇩🇪 · Gunnar Bali🇩🇪

   We report on recent progress of our analysis of the nucleon sigma terms, as well as the singlet scalar, axial and tensor nucleon charges. These are determined employing the CLS gauge ensembles, which are generated using the Lüscher-Weisz gluon action and the non-perturbatively improved Sheikholeslami-Wohlert fermion action with $N_f=2+1$ dynamical fermions. For the ensembles analysed thus far, the pion masses range from 200 MeV up to 410 MeV, and the lattice spacings take five values between 0.09~fm and 0.04~fm. We have employed a variety of methods to determine the relevant correlation functions, including the sequential source method for connected contributions and the truncated solver method for disconnected contributions.

   hep-latPoS(2022)·0 citations
4. 04*

   Heavy-Light Susceptibilities in a Strongly Coupled Quark-Gluon Plasma

   Shuai Y. F. Liu🇨🇳 · Ralf Rapp🇺🇸

   Quark number susceptibilities as computed in lattice QCD are commonly believed to provide insights into the microscopic structure of QCD matter, in particular its degrees of freedom. We generalize a previously constructed partonic $T$-matrix approach to finite chemical potential to calculate various susceptibilities, in particular for configurations containing a heavy charm quark. At vanishing chemical potential and moderate temperatures, this approach predicts large collisional widths of partons generated by dynamically formed hadronic resonance states which lead to transport parameters characteristic for a strongly coupled system. The quark chemical potential dependence is implemented into the propagators and the in-medium color potential, where two newly introduced parameters for the thermal and screening masses are fixed through a fit to the baryon number susceptibility, ${\chi }_2^B$. With this setup, we calculate heavy-light susceptibilities without further tuning; the results qualitatively agree with the lattice-QCD (lQCD) data for both ${\chi }_{11}^{uc}$ and ${\chi }_{22}^{uc}$. This implies that the lQCD results are compatible with a significant content of broad $D$-meson and charm-light diquark bound states in a moderately hot QGP.

   ↳ hep-phhep-latnucl-exnucl-thPRC(2022)·10 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.