Thu·Oct 27, 2022Thursday·October 27, 2022

1. 01*

   Bump of sound velocity in dense 2-color QCD

   Etsuko Itou🇯🇵 · Kei Iida🇯🇵

   We obtain the equation of state (EoS) and the sound velocity for 2-color QCD at low temperature and high density and find that in the superfluid phase, $c_s^2/c^2>1/3$, where $1/3$ is the value at the relativistic limit. Several independent Monte Carlo studies on 2-color QCD have been conducted intensively in recent years. These works have shown a clear evidence of phase transition between hadronic and superfluid phases. In our paper[1], we have investigated the EoS and sound velocity in both phases. Our result is consistent with chiral perturbation theory in a low $\mu$ regime of the superfluid phase including the Bose-Einstein condensed phase, and shows a peak of sound velocity in the high-density BCS phase. We also give detailed simulation results and a comment on the holography bound in this proceedings.

   hep-lathep-phnucl-thPoS(2023)·7 citations
2. 02*

   Strange partners of the doubly charmed tetraquark $T_{cc}^{+}$

   S. S. Agaev🇦🇿 · K. Azizi🇮🇷 · H. Sundu🇹🇷

   The spectroscopic parameters and widths of the axial-vector $T_{cc:s}^{\mathrm{AV}}$ and scalar $T_{cc:s}^{\mathrm{S}}$, ${\tilde{T}}_{cc:s}^{\mathrm{S}}$ strange partners of the doubly charmed exotic meson $T_{cc}^{+}$ with the content $cc\overline{u}\overline{s}$, are calculated in the framework of the QCD sum rule method. We model $T_{cc:s}^{\mathrm{AV}}$ as the diquark-antidiquark state composed of axial-vector and scalar components, whereas scalar particles $T_{cc:s}^{\mathrm{S}}$ and ${\tilde{T}}_{cc:s}^{\mathrm{S}}$ are built of axial-vector and scalar diquarks, respectively. The masses and current couplings of these tetraquarks are calculated in the context of the two-point sum rule approach by taking into account the quark, gluon and mixed condensates up to dimension $10$. The full width of the state $T_{cc:s}^{\mathrm{AV}}$ is found from analysis of the processes $T_{cc:s}^{\mathrm{AV}}\to D^0{D}_s^{\ast +}$ and $T_{cc:s}^{\mathrm{AV}}\to D^{\ast }(2007{)}^0{D}_s^{+}$. Decays to $D^0{D}_s^{+}$, $D^{\ast }(2007{)}^0{D}_s^{\ast +}$ and $D^0{D}_s^{+}$ mesons are utilized in the case of the scalar tetraquarks $T_{cc:s}^{\mathrm{S}}$ and ${\tilde{T}}_{cc:s}^{\mathrm{S}}$, respectively. The partial widths of the aforementioned decays are determined via the strong couplings $g_1$, $g_2$, $G_1$, $G_2$ and $\tilde{G}$, which describe the strong interactions of the particles at the relevant tetraquark-meson-meson vertices. These couplings are computed using the QCD three-point sum rule method, most appropriate for the strong decays under study. ....

   ↳ hep-phhep-exhep-latEur.Phys.J.Plus(2023)·4 citations
3. 03*

   Quantum simulator of link models using spinor dipolar ultracold atoms

   Pierpaolo Fontana🇮🇹 · Joao C. Pinto Barros🇨🇭 · Andrea Trombettoni🇮🇹

   We propose a scheme for the quantum simulation of quantum link models in two-dimensional lattices. Our approach considers spinor dipolar gases on a suitably shaped lattice, where the dynamics of particles in the different hyperfine levels of the gas takes place in one-dimensional chains coupled by the dipolar interactions. We show that at least four levels are needed. The present scheme does not require any particular fine-tuning of the parameters. We perform the derivation of the parameters of the quantum link models by means of two different approaches, a non-perturbative one tied to angular momentum conservation, and a perturbative one. A comparison with other schemes for $(2+1)$-dimensional quantum link models present in literature is discussed. Finally, the extension to three-dimensional lattices is presented, and its subtleties are pointed out.

   ↳ cond-mat.quant-gashep-lathep-thquant-phPRA(2023)·18 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.