Thu·Nov 3, 2022Thursday·November 3, 2022

1. 01*

   Antiheavy-Antiheavy-Light-Light Four-Quark Bound States

   Martin Pflaumer🇩🇪 · Constantia Alexandrou🇨🇾 · Jacob Finkenrath🇨🇾 · Theodoros Leontiou🇨🇾 · Stefan Meinel🇺🇸 · Marc Wagner🇩🇪

   We present our recent results on antiheavy-antiheavy-light-light tetraquark systems using lattice QCD. Our study of the $\bar{b}\bar{b}us$ four-quark system with quantum numbers $J^P=1^{+}$ and the $\bar{b}\bar{c}ud$ four-quark systems with $I(J^P)=0(0^{+})$ and $I(J^P)=0(1^{+})$ utilizes scattering operators at the sink to improve the extraction of the low-lying energy levels. We found a bound state for $\bar{b}\bar{b}us$ with $E_{\text{bind},\bar{b}\bar{b}us}=(-86\pm 22\pm 10)\text{MeV}$, but no indication for a bound state in both $\bar{b}\bar{c}ud$ channels. Moreover, we show preliminary results for $\bar{b}\bar{b}ud$ with $I(J^P)=0(1^{+})$, where we used scattering operators both at the sink and the source. We found a bound state and determined its infinite-volume binding energy with a scattering analysis, resulting in $E_{\text{bind},\bar{b}\bar{b}ud}=(-103\pm 8)\text{MeV}$.

   hep-latPoS(2023)·6 citations
2. 02*

   An Overview of Lattice Results for Parton Distribution Functions

   Luigi Del Debbio🇬🇧

   Following a ground-breaking proposal by Ji~\cite{PhysRevLett.110.262002}, numerical simulations of Quantum Chromo Dynamics (QCD) on a Euclidean lattice have provided new, valuable information on the structure of hadrons. In this talk, we briefly review the lattice approach to the reconstruction of parton densities, highlighting the connection between lattice observables and parton densities, with a focus on theoretical issues. Since parton distributions are extracted from lattice data by solving an inverse problem, we discuss some of the difficulties that affect these determinations and how they can be formulated in a Bayesian framework.

   hep-latSciPost Phys.Proc.(2024)·3 citations
3. 03*

   Signatures of quantum criticality in the complex inverse temperature plane

   Yang Liu · Songtai Lv🇨🇳 · Yang Yang🇨🇳 · Haiyuan Zou🇨🇳

   Concepts of the complex partition functions and the Fisher zeros provide intrinsic statistical mechanisms for finite temperature and real time dynamical phase transitions. We extend the utility of these complexifications to quantum phase transitions. We exactly identify different Fisher zeros on lines or closed curves and elucidate their correspondence with domain-wall excitations or confined mesons for the one-dimensional transverse field Ising model. The crossover behavior of the Fisher zeros provides a fascinating picture for criticality near the quantum phase transition, where the excitation energy scales are quantitatively determined. We further confirm our results by tensor network calculations and demonstrate a clear signal of deconfined meson excitations from the disruption of the closed zero curves. Our results unambiguously show significant features of Fisher zeros for a quantum phase transition and open up a new route to explore quantum criticality.

   ↳ cond-mat.str-elcond-mat.quant-gashep-latquant-phChin.Phys.Lett.(2023)·11 citations
4. 04*

   Determining the $CP$ Property of $ht\bar{t}$ Coupling via a Novel Jet Substructure Observable

   Zhite Yu🇺🇸 · Kirtimaan A. Mohan🇺🇸 · C.-P. Yuan🇺🇸

   Determining the $CP$ property of the Higgs boson is important for a precision test of the Standard Model as well as for the search for new physics. We propose a novel jet substructure observable based on the azimuthal anisotropy in a linearly polarized gluon jet that is produced in association with a Higgs boson at hadron colliders, and demonstrate that it provides a new $CP$-odd observable for determining the $CP$ property of the Higgs-top interaction. We introduce a factorization formalism to define a polarized gluon jet function with the insertion of an infrared-safe azimuthal observable to capture the linear polarization.

   ↳ hep-phhep-exhep-latnucl-thPLB(2024)·9 citations
5. 05*

   The $T_{c\bar{s}}(2900)$ as a threshold effect from the interaction of the $D^{\ast }{K}^{\ast }$, $D_s^{\ast }\rho$ channels

   R. Molina🇪🇸 · E. Oset🇪🇸

   We look at the mass distribution of the $D_s^{+}{\pi }^{-}$ in the $B^0\to {\bar{D}}^0{D}_s^{+}{\pi }^{-}$ decay, where a peak has been observed in the region of the $D_s^{\ast }\rho$, $D^{\ast }{K}^{\ast }$ thresholds. By creating these two channels together with a ${\bar{D}}^0$ in $B^0$ decay and letting them interact as coupled channels, we obtain a structure around their thresholds, short of producing a bound state, which leads to a peak in the $D_s^{+}{\pi }^{-}$ mass distribution in the $B^0\to {\bar{D}}^0{D}_s^{+}{\pi }^{-}$ decay. We conclude that the interaction between the $D^{\ast }{K}^{\ast }$ and $D_s^{\ast }\rho$ is essential to produce the cusp structure that we associate to the recently seen $T_{c\bar{s}}(2900)$, and that its experimental width is mainly due to the decay width of the $\rho$ meson. The peak obtained together with a smooth background reproduces fairly well the experimental mass distribution observed in the $B_0\to {\bar{D}}^0{D}_s^{+}{\pi }^{-}$ decay.

   ↳ hep-phhep-latPRD(2023)·42 citations
6. 06*

   Large-Scale $2+1$D $\mathrm{U}(1)$ Gauge Theory with Dynamical Matter in a Cold-Atom Quantum Simulator

   Jesse Osborne🇦🇺 · Ian P. McCulloch🇦🇺 · Bing Yang🇨🇳 · Philipp Hauke🇮🇹 · Jad C. Halimeh🇩🇪

   A major driver of quantum-simulator technology is the prospect of probing high-energy phenomena in synthetic quantum matter setups at a high level of control and tunability. Here, we propose an experimentally feasible realization of a large-scale $2+1$D $\mathrm{U}(1)$ gauge theory with dynamical matter and gauge fields in a cold-atom quantum simulator with spinless bosons. We present the full mapping of the corresponding Gauss's law onto the bosonic computational basis. We then show that the target gauge theory can be faithfully realized and stabilized by an emergent gauge protection term in a two-dimensional single-species Bose--Hubbard optical Lieb superlattice with two spatial periods along either direction, thereby requiring only moderate experimental resources already available in current cold-atom setups. Using infinite matrix product states, we calculate numerical benchmarks for adiabatic sweeps and global quench dynamics that further confirm the fidelity of the mapping. Our work brings quantum simulators of gauge theories a significant step forward in terms of investigating particle physics in higher spatial dimensions, and is readily implementable in existing cold-atom platforms.

   ↳ cond-mat.quant-gascond-mat.str-elhep-lathep-ph+1Commun.Phys.(2025)·47 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.