Latest in hep-lat

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The Role of Lattice QCD in Searches for Violations of Fundamental Symmetries and Signals for New PhysicsApr 22 2019This document is one of a series of whitepapers from the USQCD collaboration. Here, we discuss opportunities for Lattice Quantum Chromodynamics (LQCD) in the research frontier in fundamental symmetries and signals for new physics. LQCD, in synergy with ... More
Hadrons and NucleiApr 20 2019This document is one of a series of whitepapers from the USQCD collaboration. Here, we discuss opportunities for lattice QCD calculations related to the structure and spectroscopy of hadrons and nuclei. An overview of recent lattice calculations of the ... More
Opportunities for lattice QCD in quark and lepton flavor physicsApr 20 2019This document is one of a series of whitepapers from the USQCD collaboration. Here, we discuss opportunities for lattice QCD in quark and lepton flavor physics. New data generated at Belle II, LHCb, BES III, NA62, KOTO, and Fermilab E989, combined with ... More
Numerical analyses of N=2 supersymmetric quantum mechanics with cyclic Leibniz rule on latticeApr 19 2019We study a cyclic Leibniz rule, which provides a systematic approach to lattice supersymmetry, using a numerical method with a transfer matrix. The computation is carried out in N=2 supersymmetric quantum mechanics with the phi^6-interaction for weak ... More
Geometry of bounded critical phenomenaApr 18 2019We devise a geometric description of bounded systems at criticality in any dimension $d$. This is achieved by altering the flat metric with a space dependent scale factor $\gamma(x)$, $x$ belonging to a general bounded domain $\Omega$. $\gamma(x)$ is ... More
Strong dynamics with matter in multiple representations: SU(4) gauge theory with fundamental and sextet fermionsApr 18 2019We present a non-perturbative lattice study of SU(4) gauge theory with two flavors of fermions in the fundamental representation and two in the two-index antisymmetric representation: a theory closely related to a minimal partial-compositeness model for ... More
Light-meson leptonic decay rates in lattice QCD+QEDApr 18 2019The leading electromagnetic (e.m.) and strong isospin-breaking corrections to the $\pi^+ \to \mu^+ \nu[\gamma]$ and $K^+ \to \mu^+ \nu[\gamma]$ leptonic decay rates are evaluated for the first time on the lattice. The results are obtained using gauge ... More
Multigrid for Wilson Clover Fermions in GridApr 18 2019With the ever-growing number of computing architectures, performance portability is an important aspect of (Lattice QCD) software. The Grid library provides a good framework for writing such code, as it thoroughly separates hardware-specific code from ... More
Investigating the Dirac operator evaluation with FPGAsApr 18 2019In recent years the computational capacity of single Field Programmable Gate Arrays (FPGA) devices as well as their versatility has increased significantly. Adding to that the High Level Synthesis frameworks allowing to program such processors in a high ... More
Phase ambiguity of the measure for continuum Majorana fermionsApr 18 2019Integrating over a continuum Majorana fermion formally yields a functional pfaffian. We show that the phase of this pfaffian is ambiguous, as it depends on the choice of basis. This ambiguity is naturally resolved within a non-perturbative lattice definition, ... More
Lepton flavour universality violation in semileptonic tree level weak transitionsApr 17 2019The recent deviations of the experimental data on some parameters of the semileptonic $B$ and $B_c$ mesons decays from the standard model (SM) predictions indicate considerable violations of the lepton universality and as a result, possible new physics ... More
The analytic structure of thermodynamic systems with repulsive interactionsApr 17 2019Thermodynamic properties of systems with repulsive interactions, are considered in the grand canonical ensemble. The analytic structure of the excluded-volume model in the complex plane of the system chemical potential (fugacity) is elaborated, based ... More
Spectral functions of confined particlesApr 17 2019We determine the gluon and ghost spectral functions along with the analytic structure of the associated propagators from numerical data describing Landau gauge correlators at space-like momenta obtained by either solving the Dyson-Schwinger equations ... More
Observational prospects for gravitational waves from hidden or dark chiral phase transitionsApr 16 2019We study the gravitational wave (GW) signature of first-order chiral phase transitions ($\chi$PT) in strongly interacting hidden or dark sectors. We do so using several effective models in order to reliably capture the relevant non-perturbative dynamics. ... More
Studies of a thermally averaged p-wave Sommerfeld factorApr 16 2019Thermal pair annihilation of heavy particles, such as dark matter or its co-annihilation partners, can be strongly influenced by attractive interactions. We investigate the case that pair annihilation proceeds through a velocity-suppressed $p$-wave operator, ... More
Catalysis of Dynamical Chiral Symmetry Breaking by Chiral Chemical Potential in Dirac semimetalsApr 15 2019In this paper we study how dynamical chiral symmetry breaking is affected by nonzero chiral chemical potential in Dirac semimetals. To perform this study we applied lattice quantum Monte Carlo simulations of Dirac semimetals. Within lattice simulation ... More
Flux-tubes in confining gauge theories with gravitational dualApr 14 2019The emergence of flux-tubes as the distance is increased between a quark and an antiquark is explored in a three-dimensional confining gauge theory using the gauge/gravity duality. We delineate the shape of the flux-tube corresponding to the classical ... More
Supersymmetric gradient flow in Wess-Zumino modelApr 13 2019We propose a supersymmetric gradient flow equation in four dimensional Wess-Zumino model. The flow is constructed in two ways. One is based on the off-shell component fields and the other is based on the superfield formalism, in which the same result ... More
Complex Langevin analysis of the space-time structure in the Lorentzian type IIB matrix modelApr 11 2019Apr 15 2019The Lorentzian type IIB matrix model has been studied as a promising candidate for a nonperturbative formulation of superstring theory. In particular, the emergence of (3+1)D expanding space-time was observed by Monte Carlo studies of this model. It has ... More
On the structure of the emergent 3d expanding space in the Lorentzian type IIB matrix modelApr 11 2019Apr 15 2019The emergence of (3+1)-dimensional expanding space-time in the Lorentzian type IIB matrix model is an intriguing phenomenon which was observed in Monte Carlo studies of this model. In particular, this may be taken as a support to the conjecture that the ... More
Inferring the quantum density matrix with machine learningApr 11 2019We introduce two methods for estimating the density matrix for a quantum system: Quantum Maximum Likelihood and Quantum Variational Inference. In these methods, we construct a variational family to model the density matrix of a mixed quantum state. We ... More
Critical Phenomena in Causal Dynamical TriangulationsApr 11 2019Four-dimensional CDT (causal dynamical triangulations) is a lattice theory of geometries which one might use in an attempt to define quantum gravity non-perturbatively, following the standard procedures of lattice field theory. Being a theory of geometries, ... More
Emergence of Gauss' Law in a $Z_2$ Lattice Gauge TheoryApr 10 2019We explore a $Z_2$ Hamiltonian lattice gauge theory in one spatial dimension with a coupling $h$, without imposing any Gauss' law constraint. We show that in our model $h=0$ is a free deconfined quantum critical point containing massless staggered fermions ... More
Heavy Holographic Exotics: Tetraquarks as Efimov StatesApr 10 2019We provide a holographic description of non-strange multiquark exotics as compact topological molecules by binding heavy-light mesons to a tunneling configuration in D8-D$\bar 8$ that is homotopic to the vacuum state with fixed Chern-Simons number. In ... More
Heavy Holographic Exotics: Tetraquarks as Efimov StatesApr 10 2019Apr 12 2019We provide a holographic description of non-strange multiquark exotics as compact topological molecules by binding heavy-light mesons to a tunneling configuration in D8-D$\bar 8$ that is homotopic to the vacuum state with fixed Chern-Simons number. In ... More
Towards an ab initio covariant density functional for nuclear structureApr 10 2019Nuclear structure models built from phenomenological mean fields, the effective nucleon-nucleon interactions (or Lagrangians), and the realistic bare nucleon-nucleon interactions are reviewed. The success of covariant density functional theory, which ... More
Induced QCD II: Numerical resultsApr 08 2019We numerically explore an alternative discretization of continuum $\text{SU}(N_c)$ Yang-Mills theory on a Euclidean spacetime lattice, originally introduced by Budzcies and Zirnbauer for gauge group $\text{U}(N_c)$. This discretization can be reformulated ... More
Simulations of the Glasma in 3+1DApr 08 2019Apr 10 2019The Glasma is a gluonic state of matter which can be created in collisions of relativistic heavy ions and is a precursor to the quark-gluon plasma. The existence of this state is a prediction of the color glass condensate (CGC) effective theory. In many ... More
Simulations of the Glasma in 3+1DApr 08 2019The Glasma is a gluonic state of matter which can be created in collisions of relativistic heavy ions and is a precursor to the quark-gluon plasma. The existence of this state is a prediction of the color glass condensate (CGC) effective theory. In many ... More
Lattice QCD investigation of a doubly-bottom $\bar{b} \bar{b} u d$ tetraquark with quantum numbers $I(J^P) = 0(1^+)$Apr 08 2019We use lattice QCD to investigate the spectrum of the $\bar{b} \bar{b} u d$ four-quark system with quantum numbers $I(J^P) = 0(1^+)$. We use five different gauge-link ensembles with $2+1$ flavors of domain-wall fermions, including one at the physical ... More
Lattice QCD investigation of a doubly-bottom $\bar{b} \bar{b} u d$ tetraquark with quantum numbers $I(J^P) = 0(1^+)$Apr 08 2019Apr 17 2019We use lattice QCD to investigate the spectrum of the $\bar{b} \bar{b} u d$ four-quark system with quantum numbers $I(J^P) = 0(1^+)$. We use five different gauge-link ensembles with $2+1$ flavors of domain-wall fermions, including one at the physical ... More
A Lattice Story of Proton SpinApr 08 2019In this contribution, I summarized the recent Lattice QCD consensuses on the quark helicity, plus the investigations on the gluon helicity and orbital angular momenta. The preliminary non-perturbative normalized and renormalized Ji quark and gluon angular ... More
A Lattice Story of Proton SpinApr 08 2019Apr 11 2019In this contribution, I summarized the recent Lattice QCD consensuses on the quark helicity, plus the investigations on the gluon helicity and orbital angular momenta. The preliminary non-perturbative normalized and renormalized Ji quark and gluon angular ... More
The $b_1$ resonance in coupled $πω$, $πφ$ scattering from lattice QCDApr 08 2019We present the first lattice QCD calculation of coupled $\pi\omega$ and $\pi\phi$ scattering, incorporating coupled $S$ and $D$-wave $\pi\omega$ in $J^P=1^+$. Finite-volume spectra in three volumes are determined via a variational analysis of matrices ... More
Lattice QCD on upcoming Arm architecturesApr 08 2019Recently Arm introduced a new instruction set called Scalable Vector Extension (SVE), which supports vector lengths up to 2048 bits. While SVE hardware will not be generally available until about 2021, we believe that future SVE-based architectures will ... More
Transition form factors: $γ^\ast + p \to Δ(1232)$, $Δ(1600)$Apr 05 2019Electroproduction form factors describing the $\gamma^\ast p \to \Delta^+(1232), \Delta^+(1600)$ transitions are computed using a fully-dynamical diquark-quark approximation to the Poincar\'e-covariant three-body bound-state problem in relativistic quantum ... More
The quark-mass dependence of elastic $πK$ scattering from QCDApr 05 2019We present a determination of the isospin-1/2 elastic $\pi K$ scattering amplitudes in S and P partial waves using lattice Quantum Chromodynamics. The amplitudes, constrained for a large number of real-valued energy points, are obtained as a function ... More
The leading hadronic contribution to $(g-2)_μ$ from lattice QCD with $N_{\rm f}=2+1$ flavours of O($a$) improved Wilson quarksApr 05 2019The comparison of the theoretical and experimental determinations of the anomalous magnetic moment of the muon $(g-2)_\mu$ constitutes one of the strongest tests of the Standard Model at low energies. In this article, we compute the leading hadronic contribution ... More
NJL-type models in the presence of intense magnetic fields: the role of the regularization prescriptionApr 04 2019We study the regularization dependence of the Nambu-Jona--Lasinio model (NJL) predictions for some properties of magnetized quark matter at zero temperature (and baryonic density) in the mean field approximation. The model parameter dependence for each ... More
Pion-photon transition form factor in QCD. Theoretical predictions and topology-based data analysisApr 04 2019Apr 05 2019We discuss the evaluation of the transition form factor (TFF) $F^{\gamma*\gamma\pi^0}(Q^2)$ by means of QCD theory and by state-space reconstruction from topological data analysis. We first calculate this quantity in terms of quark-gluon interactions ... More
Testing the strength of the $\text{U}_A(1)$ anomaly at the chiral phase transition in two-flavour QCDApr 04 2019We study the thermal transition of QCD with two degenerate light flavours by lattice simulations using $\mathcal{O}(a)$-improved Wilson quarks. Particular emphasis lies on the pattern of chiral symmetry restoration, which we probe via the static screening ... More
Isospin splittings in the decuplet baryon spectrum from dynamical QCD+QEDApr 04 2019We report a new analysis of the isospin splittings within the decuplet baryon spectrum. Our numerical results are based upon five ensembles of dynamical QCD+QED lattices. The analysis is carried out within a flavour-breaking expansion which encodes the ... More
Lattice QCD form factor for $B_s\to D_s^* lν$ at zero recoil with non-perturbative current renormalisationApr 03 2019We present details of a lattice QCD calculation of the $B_s\to D_s^*$ axial form factor at zero recoil using the Highly Improved Staggered Quark (HISQ) formalism on the second generation MILC gluon ensembles that include up, down, strange and charm quarks ... More
Reliable estimation of the radius of convergence in finite density QCDApr 03 2019We study different estimators of the radius of convergence of the Taylor series of the pressure in finite density QCD. We adopt the approach in which the radius of convergence is estimated first in a finite volume, and the infinite-volume limit is taken ... More
Chiral-spin symmetry emergence in baryons and eigenmodes of the Dirac operatorApr 03 2019Truncating the low-lying modes of the lattice Dirac operator results in an emergence of the chiral-spin symmetry $SU(2)_{CS}$ and its flavor extension $SU(2N_F)$ in hadrons. These are symmetries of the quark - chromo-electric interaction and include chiral ... More
On the validity of perturbative studies of the electroweak phase transition in the Two Higgs Doublet modelApr 02 2019Making use of a dimensionally-reduced effective theory at high temperature, we perform a nonperturbative study of the electroweak phase transition in the Two Higgs Doublet model. We focus on two phenomenologically allowed points in the parameter space, ... More
Phase structure of three flavor QCD in external magnetic fields using HISQ fermionsApr 02 2019We study the phase structure of QCD with three degenerate flavors in the external magnetic fields using highly improved staggered quarks (HISQ). The simulations are performed on $16^3\times 6$ lattice. In order to investigate the quark mass dependence ... More
Quantized first-order phase transition and two sets of critical end point in droplet quark matterApr 02 2019The finite-size effect on the chiral phase transition is investigated in the Nambu--Jona-Lasinio model. To take into account finite-size effects, momentum integrals are replaced by momentum summations. The ground state of quark matter at finite size is ... More
Effects of the QCD Equation of State and Lepton Asymmetry on Primordial Gravitational WavesApr 01 2019Using the quantum chromodynamics (QCD) equation of state (EoS) from lattice calculations we investigate effects from QCD on primordial gravitational waves (PGWs) produced during the inflationary era. We also consider different cases for vanishing and ... More
A Complete Matching for Quasi-distribution Functions in Large Momentum Effective TheoryApr 01 2019We complete the procedure of extracting parton distribution functions (PDFs) using large momentum effective theory (LaMET) at leading power accuracy in the hadron momentum. We derive a general factorization formula for the quasi PDFs in the presence of ... More
Bs mixing observables and Vtd/Vts from sum rulesApr 01 2019We consider the effects of a non-vanishing strange-quark mass in the determination of the full basis of dimension six matrix elements for $B_{s}$ mixing, in particular we get for the ratio of the $V-A$ Bag parameter in the $B_s$ and $B_d$ system: $\overline{B}^s_{Q_1} ... More
Towards a precise determination of the equation of state of QCD at high-temperatureApr 01 2019We present preliminary results towards a fully non-perturbative determination of the equation of state of QCD at very high-temperatures, $T\approx 3-80\,{\rm GeV}$. The key ingredient is the lattice formulation of QCD in a moving reference frame, which ... More
Joint Contour Net Analysis for Feature Detection in Lattice Quantum Chromodynamics DataMar 31 2019In this paper we demonstrate the use of multivariate topological algorithms to analyse and interpret Lattice Quantum Chromodynamics (QCD) data. Lattice QCD is a long established field of theoretical physics research in the pursuit of understanding the ... More
Quark mass dependence of on-shell and half off-shell scattering amplitudes from Bethe-Salpeter wave function inside the interaction rangeMar 31 2019We evaluate scattering amplitudes at on-shell and half off-shell for $I=2$ S-wave two-pion system using the Bethe-Salpeter wave function inside the interaction range in the quenched QCD. The scattering length and effective range are extracted from these ... More
Present and future prospects for lattice QCD calculations of matrix elements for nEDMMar 31 2019A status report on the calculations of the contribution of four CP violating operators, the $\Theta$-term, the quark EDM, the chromo EDM and the Weinberg operator to the neutron EDM are presented. At this time, there exit precise physical results only ... More
Lattice QCD calculations of the quark and gluon contributions to the proton spinMar 31 2019A review of the calculations of the proton's spin using lattice QCD is presented. Results for the three contributions, the quark contribution $\sum_{q=u,d,s,c} (\frac{1}{2} {\Delta q})$, the total angular momentum of the quarks $J_q$ and of the gluons ... More
Anisotropic pressure induced by finite-size effects in SU(3) Yang-Mills theoryMar 30 2019We study the pressure anisotropy in anisotropic finite-size systems in SU(3) Yang-Mills theory at nonzero temperature. Lattice simulations are performed on lattices with anisotropic spatial volumes with periodic boundary conditions. The energy-momentum ... More
Anisotropic pressure induced by finite-size effects in SU(3) Yang-Mills theoryMar 30 2019Apr 16 2019We study the pressure anisotropy in anisotropic finite-size systems in SU(3) Yang-Mills theory at nonzero temperature. Lattice simulations are performed on lattices with anisotropic spatial volumes with periodic boundary conditions. The energy-momentum ... More
Meson-meson scattering lengths at maximum isospin from lattice QCDMar 30 2019Apr 03 2019We summarize our lattice QCD determinations of the pion-pion, pion-kaon and kaon-kaon s-wave scattering lengths at maximal isospin with a particular focus on the extrapolation to the physical point and the usage of next-to-leading order chiral perturbation ... More
Meson-meson scattering lengths at maximum isospin from lattice QCDMar 30 2019We summarize our lattice QCD determinations of the pion-pion, pion-kaon and kaon-kaon s-wave scattering lengths at maximal isospin with a particular focus on the extrapolation to the physical point and the usage of next-to-leading order chiral perturbation ... More
The coming synergy between lattice QCD and high-energy phenomenologyMar 29 2019Building upon the PDFSense framework developed in Ref. [1], we perform a comprehensive analysis of the sensitivity of present and future high-energy data to a number of ``standard candle'' quantities typically evaluated in lattice gauge theory, with a ... More
Baryon distribution amplitudes in QCDMar 29 2019We present lattice QCD results for the wave function normalization constants and the first moments of the distribution amplitudes for the lowest-lying baryon octet. The analysis is based on a large number of $N_f=2+1$ ensembles comprising multiple trajectories ... More
Strange electromagnetic form factors of the nucleon with $N_f = 2 + 1$ $\mathcal{O}(a)$-improved Wilson fermionsMar 29 2019We present results for the strange contribution to the electromagnetic form factors of the nucleon computed on the CLS ensembles with $N_f=2+1$ flavors of $\mathcal{O}(a)$-improved Wilson fermions and an $\mathcal{O}(a)$-improved vector current. Several ... More
Pentaquark and Tetraquark statesMar 28 2019The past seventeen years have witnessed tremendous progress on the experimental and theoretical explorations of the multiquark states. The hidden-charm and hidden-bottom multiquark systems were reviewed extensively in [Phys. Rept. 639 (2016) 1-121]. In ... More
Pentaquark and Tetraquark statesMar 28 2019Apr 01 2019The past seventeen years have witnessed tremendous progress on the experimental and theoretical explorations of the multiquark states. The hidden-charm and hidden-bottom multiquark systems were reviewed extensively in [Phys. Rept. 639 (2016) 1-121]. In ... More
Strong decays of double-charmed pseudoscalar and scalar $cc\overline{u}\overline{d}$ tetraquarksMar 28 2019The strong decays of the pseudoscalar and scalar double-charmed tetraquarks $ T_{cc;\overline{u}\overline{d}}^{+}$ and $\widetilde{T}_{cc;\overline{u} \overline{d}}^{+}$ are investigated in the framework of the QCD sum rule method. The mass and coupling ... More
Nucleon Structure from Lattice QCD CalculationsMar 28 2019Parton distribution and correlation functions describe the relation between a hadron and the quarks and gluons (or collectively, the partons) within it, and carry rich information on hadron's partonic structure that cannot be calculated by QCD perturbation ... More
TKNN formula for general HamiltonianMar 28 2019Apr 11 2019Topological insulators in odd dimensions are characterized by topological numbers. We prove the well-known relation between the topological number given by the Chern character of the Berry curvature and the Chern-Simons level of the low energy effective ... More
TKNN formula for general HamiltonianMar 28 2019Topological insulators in odd dimensions are characterized by topological numbers. We prove the well-known relation between the topological number given by the Chern character of the Berry curvature and the Chern-Simons level of the low energy effective ... More
Roberge-Weiss periodicity, canonical sector and modified Polyakov-loopMar 28 2019To obtain deeper understanding of QCD properties at finite temperature, we consider the Fourier decomposition of the grand-canonical partition function based on the canonical ensemble method via the imaginary chemical potential. Expectation values are, ... More
Scattering amplitudes from finite-volume spectral functionsMar 28 2019A novel proposal is outlined to determine scattering amplitudes from finite-volume spectral functions. The method requires extracting smeared spectral functions from finite-volume Euclidean correlation functions, with a particular complex smearing kernel ... More
Chiral Estimate of QCD Pseudocritical LineMar 27 2019Relatively low crossover temperature suggests that chiral symmetry restoration in QCD may well be described within the low-energy effective theory. The shape of the pseudocritical line in the T-mu plane is estimated within this assumption. No critical ... More
Chiral Estimate of QCD Pseudocritical LineMar 27 2019Apr 12 2019Relatively low crossover temperature suggests that chiral symmetry restoration in QCD may well be described within the low-energy effective theory. The shape of the pseudocritical line in the T-mu plane is estimated within this assumption. No critical ... More
Nonperturbative analysis of the gravitational waves from a first-order electroweak phase transitionMar 27 2019We present the first end-to-end nonperturbative analysis of the gravitational wave power spectrum from a thermal first-order electroweak phase transition (EWPT), using the framework of dimensionally reduced effective field theory and pre-existing nonperturbative ... More
Emergence of a complete heavy-quark spin symmetry multiplet: seven molecular pentaquarks in light of the latest LHCb analysisMar 27 2019Apr 09 2019A recent analysis by the LHCb collaboration suggests the existence of three narrow pentaquark-like states --- the $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$ --- instead of just one in the previous analysis (the $P_c(4450)$). The closeness of the $P_c(4312)$ ... More
Emergence of a complete heavy-quark spin symmetry multiplet: seven molecular pentaquarks in light of the latest LHCb analysisMar 27 2019A recent analysis by the LHCb collaboration suggests the existence of three narrow pentaquark-like states --- the $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$ --- instead of just one in the previous analysis (the $P_c(4450)$). The closeness of the $P_c(4312)$ ... More
Non-cancellation of the parity anomaly in the strong-field regime of QED$_{2+1}$Mar 26 2019Quantum fluctuations lead to an anomalous violation of parity symmetry in quantum electrodynamics for an even number of spatial dimensions. While the leading parity-odd electric current vanishes in vacuum, we uncover a non-cancellation of the anomaly ... More
Dark-matter-nucleus scattering in chiral effective field theoryMar 26 2019Chiral effective field theory allows one to calculate the response of few-nucleon systems to external currents, both for currents that can be probed in the Standard Model and ones that only exist in Standard-Model extensions. In combination with state-of-the-art ... More
Strong LHCb evidence for supporting the existence of hidden-charm molecular pentaquarksMar 26 2019In 26 March 2019, at the Rencontres de Moriond QCD conference, the LHCb Collaboration reported the observation of new pentaquarks, namely $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$. Within the framework of one-boson-exchange (OBE) model, our study indicates ... More
Strong LHCb evidence supporting the existence of the hidden-charm molecular pentaquarksMar 26 2019Mar 28 2019On March 26th, 2019, at the Rencontres de Moriond QCD conference, the LHCb Collaboration reported the observation of three new pentaquarks, namely $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$, which are consistent with the loosely bound molecular hidden-charm ... More
Spectral properties of light and charm mesons from $N_f=2+1$ anisotropic lattice QCDMar 26 2019We compute temporal correlators and spectral functions for light, open charm and charmonium mesons in the pseudoscalar and vector channel for a range of temperatures below and above the deconfinement transition. The study is carried out using anisotropic ... More
Single pseudoscalar meson pole and pion box contributions to the anomalous magnetic moment of the muonMar 26 2019We present results for single pseudoscalar meson pole contributions and pion box contributions to the hadronic light-by-light (LBL) correction of the muon's anomalous magnetic moment. We follow the recently developed dispersive approach to LBL, where ... More
Electromagnetic finite-size effects to the hadronic vacuum polarizationMar 25 2019In order to reduce the current hadronic uncertainties in the theory prediction for the anomalous magnetic moment of the muon, lattice calculations need to reach sub-percent accuracy on the hadronic-vacuum-polarization contribution. This requires the inclusion ... More
Type of dual superconductivity for the $SU(2)$ Yang--Mills theoryMar 25 2019We investigate the type of dual superconductivity responsible for quark confinement. For this purpose, we solve the field equations of the $U(1)$ gauge-scalar model to obtain the static vortex solution in the whole range without restricting to the long-distance ... More
Type of dual superconductivity for $SU(2)$ and $SU(3)$ Yang--Mills theoriesMar 25 2019We investigate the type of dual superconductivity responsible for quark confinement. For this purpose, we solve the field equations of the $U(1)$ Abelian--Higgs model to obtain the static vortex solution in the whole range without restricting to the long-distance ... More
Frequency-splitting estimators of single-propagator tracesMar 25 2019Single-propagator traces are the most elementary fermion Wick contractions which occur in numerical lattice QCD, and are usually computed by introducing random-noise estimators to profit from volume averaging. The additional contribution to the variance ... More
The theta dependence of the vacuum energy density in chiral effective Lagrangian models at finite temperature (above $T_c$)Mar 25 2019In this work, extending a previous study at zero temperature ($T=0$), we perform a systematic study of the modifications to the QCD vacuum energy density $\epsilon_{vac}$ in the finite-temperature case, above the chiral transition at $T_c$, caused by ... More
A note on the vacuum structure to lattice Euclidean quantum gravityMar 24 2019It is shown that the ground state or vacuum to the lattice Euclidean quantum gravity is significantly different from the ground states to the well-known vacua in QED, QCD, et cetera. In the case of the lattice Euclidean quantum gravity, the long-wavelength ... More
On Thermodynamic and Ultraviolet Stability of Yang-MillsMar 23 2019We prove ultraviolet stable stability bounds for the pure Yang-Mills relativistic quantum theory in an imaginary-time, functional integral formulation. We consider the gauge groups $\mathcal G={\rm U}(N)$, ${\rm SU}(N)$ and let $d(N)$ denote their Lie ... More
Large-$N_c$ and Large-$N_F$ Limits of SU($N_c$) Gauge Theories with Fermions in Different RepresentationsMar 22 2019We present calculations of certain limits of scheme-independent series expansions for the anomalous dimensions of gauge-invariant fermion bilinear operators and for the derivative of the beta function at an infrared fixed point in SU($N_c$) gauge theories ... More
Simple non-perturbative resummation schemes beyond mean-field II: thermodynamics of scalar $φ^4$ theory in 1+1 dimensions at arbitrary couplingMar 22 2019Recently, non-perturbative approximate solutions were presented that go beyond the well-known mean-field resummation. In this work, these non-perturbative approximations are used to calculate finite temperature equilibrium properties for scalar $\phi^4$ ... More
Lattice calculation of the pion transition form factor with $N_f=2+1$ Wilson quarksMar 22 2019We present a lattice QCD calculation of the double-virtual neutral pion transition form factor, with the goal to cover the kinematic range relevant to hadronic light-by-light scattering in the muon $g-2$. Several improvements have been made compared to ... More
Safe Glueballs and BaryonsMar 21 2019We consider a non-Abelian gauge theory with $N_f$ fermions and discuss the possible existence of a non-trivial UV fixed point at large $N_f$. Specifically, we study the anomalous dimension of the (rescaled) glueball operator $\text{Tr}\ F^2$ to first ... More
Zero-mode contribution and quantized first order phase transition in a droplet quark matterMar 20 2019The finite size effect on hadron physics and quark matter has attracted much interest for more than three decades, it is still in suspense whether the periodic (with zero-momentum mode) or the anti-periodic (without zero-momentum mode) spatial boundary ... More
Publicising Lattice Field Theory through VisualisationMar 20 2019The gluon field configurations that form the foundation of every lattice QCD calculation contain a rich diversity of emergent nonperturbative structure. Visualisations of these phenomena not only serve to explain the concept of a nontrivial vacuum but ... More
Quantum Simulation of Gauge TheoriesMar 20 2019Apr 03 2019A general scheme is presented for simulating gauge theories, with matter fields, on a digital quantum computer. A Trotterized time-evolution operator that respects gauge symmetry is constructed, and a procedure for obtaining time-separated, gauge-invariant ... More
Quantum Simulation of Gauge TheoriesMar 20 2019A general scheme is presented for simulating gauge theories, with matter fields, on a digital quantum computer. A Trotterized time-evolution operator that respects gauge symmetry is constructed, and a procedure for obtaining time-separated, gauge-invariant ... More
Thermal Quarkonium Mass Shift from Euclidean CorrelatorsMar 19 2019Brambilla, Escobedo, Soto, and Vairo have derived an effective description of quarkonium with two parameters; a momentum diffusion term and a real self-energy term. We point out that the real self-energy term can be expressed directly in terms of Euclidean ... More
Transport coefficients from in medium quarkonium dynamicsMar 19 2019The in medium dynamics of heavy particles are governed by transport coefficients. The heavy quark momentum diffusion coefficient, $\kappa$, is an object of special interest in the literature, but one which has proven notoriously difficult to estimate, ... More
Light-cone distribution amplitudes of pseudoscalar mesons from lattice QCDMar 19 2019We present the first lattice determination of the two lowest Gegenbauer moments of the leading-twist pion and kaon light-cone distribution amplitudes with full control of all errors: $a_2^\pi=0.099^{+24}_{-24}$ for the pion; $a_1^K=0.0533^{+34}_{-35}$ ... More