Mon·Oct 4, 2021Monday·October 4, 2021

1. 01*

   Static Potential At Non-zero Temperatures From Fine Lattices

   D. Hoying🇺🇸 · A. Bazavov🇺🇸 · D. Bala🇩🇪 · G. Parkar🇳🇴 · O. Kaczmarek🇩🇪 · R. Larsen🇳🇴 · Swagato Mukherjee🇺🇸 · P. Petreczky🇺🇸 · A. Rothkopf🇳🇴 · J. H. Weber🇩🇪

   We report on a preliminary study of static quark anti-quark potential at non-zero temperature in $2+1$ flavor QCD using $96^3\times N_{\tau }$ lattices with lattice spacing $a=0.028$fm, physical strange quark mass and light quark masses corresponding to pion mass of about $300$ MeV. We use $N_{\tau }=32,24,20$ and $16$ that correspond to temperature range $T=220-441$ MeV. The in order to obtain the potential we calculate the Wilson line correlator in Coulomb gauge with additional HYP smearing to reduce the noise at large quark anti-quark separations. We apply $0$, $5$ and $10$ steps of HYP smearing to ensure that there is no physical effect from over-smearing. At the two highest temperatures we also consider a noise reduction technique that is based on an interpolation in the spatial separation between the static quark and anti-quark.

   hep-latPoS(2022)·3 citations
2. 02*

   Is $Z_{cs}(3982)$ a molecular partner of $Z_c(3900)$ and $Z_c(4020)$ states?

   V. Baru🇩🇪 · E. Epelbaum🇩🇪 · A. A. Filin🇩🇪 · C. Hanhart🇩🇪 · A. V. Nefediev🇷🇺

   We perform an effective-field-theory-based coupled-channel analysis of the recent BES III data on the $e^{+}{e}^{-}$ annihilation into the final state $K^{+}(D_s^{-}{D}^{\ast 0}+D_s^{\ast -}{D}^0)$ in a wide energy range and extract the poles responsible for the formation of the $Z_{cs}(3982)$. We identify two scenarios which provide a similar description of the experimental mass distributions but result in utterly different predictions for the spin partners of the $Z_{cs}(3982)$: although both scenarios are consistent with the $Z_{cs}$ as a $SU(3)$ partner of the $Z_c(3900)$, the $Z_c(4020)$ appears naturally as a spin partner of these states only in one of them (fit 1) while in the other (fit 2) its nature has to be different. Also, the $Z_{cs}(3982)$ has a $J^P=1^{+}$ spin partner near the ${\bar{D}}_s^{\ast }{D}^{\ast }$ threshold in fit 1, while no such state exists in fit 2. We predict the ${\bar{D}}_s^{\ast }{D}^{\ast }$ invariant mass distribution in the $J^P=1^{+}$ channel for the reaction $e^{+}{e}^{-}\to K^{+}{D}_s^{\ast -}{D}^{\ast 0}$ and argue that this line shape can be used to distinguish between the two scenarios once data in this channel are available.

   ↳ hep-phhep-exhep-latnucl-thPRD(2022)·36 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.