Fri·Sep 10, 2021Friday·September 10, 2021

1. 01*

   Phase diagram of the 2+1-dimensional Gross-Neveu model with chiral imbalance

   Marc Winstel🇩🇪 · Laurin Pannullo🇩🇪 · Marc Wagner🇩🇪

   In this work, the phase diagram of the $2+1$-dimensional Gross-Neveu model is investigated with baryon chemical potential as well as chiral chemical potential in the mean-field approximation. We study the theory using two lattice discretizations, which are both based on naive fermions. An inhomogeneous chiral phase is observed only for one of the two discretizations. Our results suggest that this phase disappears in the continuum limit.

   hep-lathep-phPoS(2022)·11 citations
2. 02*

   Hidden-charm tetraquarks with strangeness in the chiral quark model

   Gang Yang🇨🇳 · Jialun Ping🇨🇳 · Jorge Segovia🇪🇸

   The hidden-charm tetraquarks with strangeness, $c\bar{c}s\bar{q}$ $(q=u,d)$, in $J^P=0^{+}$, $1^{+}$ and $2^{+}$ are systematically investigated in the framework of real- and complex-scaling range of a chiral quark model, whose parameters have been fixed in advance describing hadron, hadron-hadron and multiquark phenomenology. Each tetraquark configuration, compatible with the quantum numbers studied, is taken into account; this includes meson-meson, diquark-antidiquark and K-type arrangements of quarks with all possible color wave functions in four-body sector. Among the different numerical techniques to solve the Schrödinger-like 4-body bound state equation, we use a variational method in which the trial wave function is expanded in complex-range Gaussian basis functions, which is characterized by its simplicity and flexibility. This theoretical framework has already been used to study different kinds of multiquark systems, such as the hidden-charm pentaquarks, $P_c^{+}$, and doubly-charmed tetraquarks, $T_{cc}^{+}$. The recently reported $Z_{cs}$ states by the BESIII and LHCb collaborations are generally compatible with either compact tetraquark or hadronic molecular resonance configurations in our investigation. Moreover, several additional exotic resonances are found in the mass range between 3.8 GeV and 4.6 GeV.

   ↳ hep-phhep-exhep-latnucl-ex+1PRD(2021)·36 citations
3. 03*

   The cylinder amplitude in the Hard Dimer model on 2D Causal Dynamical Triangulations

   John F. Wheater🇬🇧 · P.D. Xavier🇬🇧

   We consider the model of hard dimers coupled to two-dimensional Causal Dynamical Triangulations (CDT) with all dimer types present and solve it exactly subject to a single restriction. Depending on the dimer weights there are, in addition to the usual gravity phase of CDT, two tri-critical and two dense dimer phases. We establish the properties of these phases, computing their cylinder and disk amplitudes, and their scaling limits.

   ↳ hep-thgr-qchep-latClass.Quant.Grav.(2022)·4 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.