Wed·Dec 15, 2021Wednesday·December 15, 2021

1. 01*

   Bottomonia screening masses from $2+1$ flavor QCD

   Peter Petreczky🇺🇸 · Sayantan Sharma🇮🇳 · Johannes Heinrich Weber🇩🇪

   The sequential melting of the bottomonium states is one of the important signals for the existence of a quark gluon plasma. The study of bottomonia spectral functions on the lattice is a difficult task for many reasons. Calculations based on NRQCD, that are commonly used for such purpose, are not applicable at high temperatures. In this work we propose a new method to study this problem by calculating the spatial screening masses of bottomonium states. We calculate the spatial meson correlators and extract the screening masses for mesons in different quantum channels using highly improved staggered quark (HISQ) action for bottom quarks and dynamical $2+1$ flavor QCD HISQ gauge configurations. The typical lattices we choose are of size $N_s^3\times N_{\tau }$ where $N_s=4N_{\tau }$ and $N_{\tau }=8,10,12$. We consider the temperature range $T=300$-$1000$ MeV. We show that for $T>500$ MeV the temperature dependence of the screening masses of the ground state bottomonia are compatible with the expectations based on uncorrelated quark anti-quark pairs.

   hep-lathep-phnucl-th1 citation
2. 02*

   $I=1$ $\pi$-$\pi$ scattering at the physical point

   Srijit Paul🇩🇪 · Andrew D. Hanlon🇺🇸 · Ben Hörz🇺🇸 · Daniel Mohler🇩🇪 · Colin Morningstar🇺🇸 · Hartmut Wittig🇩🇪

   We present a preliminary analysis of $I=1$ $\pi \pi$ scattering at the physical point. We make use of the stochastic variant of the distillation framework (also known as sLapH) to compute the relevant two-point correlation matrices using a basis of single and multihadron interpolating operators to estimate the low energy spectra. We perform the Lüscher analysis to determine the scattering phase shift which is finding good agreement with the experimentally obtained phase shifts.

   hep-latPoS(2022)·11 citations
3. 03*

   Nucleon Helicity Generalized Parton Distribution at Physical Pion Mass from Lattice QCD

   Huey-Wen Lin🇺🇸

   The generalized parton distributions (GPDs) offer a window on three-dimensional imaging of the nucleon, providing understanding of how the fundamental properties of the nucleon, such as its mass and spin, arise from the underlying quark and gluon degrees of freedom. In this work, we present the first lattice calculation of the nucleon isovector helicity GPD at physical pion mass, using an $a\approx 0.09$ fm lattice ensemble with 2+1+1 flavors of highly improved staggered quarks generated by MILC Collaboration. We perform the GPD calculation in Breit frame using averaged nucleon boost momentum $P_z\approx 2.2$ GeV with nonzero momentum transfers in $[0.2,1.0]{\text{ GeV}}^2$. Nonperturbative renormalization in RI/MOM scheme is used to obtain the quasi-distribution before matching to the lightcone GPDs. The three-dimensional distribution $\tilde{H}(x,Q^2)$ is presented, along with the three-dimensional nucleon tomography and impact-parameter--dependent distribution for selected Bjorken $x$ at $\mu =3$ GeV in $\overline{\text{MS}}$ scheme.

   hep-lathep-phnucl-thPLB(2022)·88 citations
4. 04*

   Quantum computing for lattice supersymmetry

   Christopher Culver🇬🇧 · David Schaich🇬🇧

   Quantum computing promises the possibility of studying the real-time dynamics of nonperturbative quantum field theories while avoiding the sign problem that obstructs conventional lattice approaches. Current and near-future quantum devices are severely limited by noise, making investigations of simple low-dimensional lattice systems ideal testbeds for algorithm development. Considering simple supersymmetric systems, such as supersymmetric quantum mechanics with different superpotentials, allows for the analysis of phenomena like dynamical supersymmetry breaking. We present ongoing work applying quantum computing techniques to study such theories, targeting real-time dynamics and supersymmetry breaking effects.

   hep-latPoS(2022)·13 citations
5. 05*

   Pairing patterns in polarized unitary Fermi gases above the superfluid transition

   Felipe Attanasio🇩🇪 · Lukas Rammelmüller🇩🇪 · Joaquín E. Drut🇺🇸 · Jens Braun🇩🇪

   We non-perturbatively study pairing in the high-temperature regime of polarized unitary two-component Fermi gases by extracting the pair-momentum distribution and shot-noise correlations. Whereas the pair-momentum distribution allows us to analyze the propagation of pairs composed of one spin-up and one spin-down fermion, shot-noise correlations provide us with a tomographic insight into pairing correlations around the Fermi surfaces associated with the two species. Assuming that the dominant pairing patterns right above the superfluid transition also govern the formation of condensates in the low-temperature regime, our analysis suggests that the superfluid ground state is homogeneous and of the Bardeen-Cooper-Schrieffer-type over a wide range of polarizations.

   ↳ cond-mat.quant-gashep-latnucl-thPRA(2022)·9 citations
6. 06*

   QCD at high temperature and density: selected highlights

   Jon-Ivar Skullerud🇮🇪

   I review some of the recent progress in QCD at high temperature and density, with a focus on the nature of the high-temperature transition; cold and dense matter; and hadron properties and transport coefficients at high temperature.

   ↳ hep-phhep-latnucl-thEPJ Web Conf.(2022)·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.