Latest in hep-lat

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Particles propagation on a torusAug 21 2019Based on variational principle and Faddeev method, we present a general framework toward finding propagating solutions of multiple interacting particles on a torus. Two different versions of multiple particles secular equations are presented. Version ... More
Non-relativistic susceptibility and a dark matter applicationAug 20 2019When thermal rate equations are derived for the evolution of slow variables, it is often practical to parametrize the right-hand side with chemical potentials. To close the system, the chemical potentials are subsequently re-expressed in terms of the ... More
Topological effects in continuum 2d $U(N)$ gauge theoriesAug 20 2019We study the $\theta$ dependence of the continuum limit of 2d $U(N)$ gauge theories defined on compact manifolds, with special emphasis on spherical ($g=0$) and toroidal ($g=1$) topologies. We find that the coupling between $U(1)$ and $SU(N)$ degrees ... More
Cost Reduction of Swapping Bonds Part in Anisotropic Tensor Renormalization GroupAug 20 2019The bottleneck part of anisotropic tensor renormalization group (ATRG) is a swapping bonds part which consists of a contraction of two tensors and a partial singular value decomposition of a matrix, and their computational costs are $O(\chi^{2d+1})$, ... More
Sparsening Algorithm for Multi-Hadron Lattice QCD Correlation FunctionsAug 19 2019Modern advances in algorithms for lattice QCD calculations have steadily driven down the resources required to generate gauge field ensembles and calculate quark propagators, such that, in cases relevant to nuclear physics, performing quark contractions ... More
SU(2) non-Abelian gauge field theory in one dimension on digital quantum computersAug 19 2019An improved mapping of one-dimensional SU(2) non-Abelian gauge theory onto qubit degrees of freedom is presented. This new mapping allows for a reduced unphysical Hilbert space. Insensitivity to interactions within this unphysical space is exploited to ... More
Towards a theory of baryon resonancesAug 19 2019In this talk, I discuss methods that allow for a systematic and model-independent calculation of the hadron spectrum. These are lattice QCD and/or its corresponding Effective Field Theories. Assorted results are shown and I take the opportunity to discuss ... More
Nucleon's energy-momentum tensor form factors in light-cone QCDAug 16 2019We use the energy-momentum tensor (EMT) current to compute the EMT form factors of the nucleon in the framework of the light cone QCD sum rule formalism. In the calculations, we employ the most general form of the nucleon's interpolating field and use ... More
Numerical determination of monopole scaling dimension in parity-invariant three-dimensional non-compact QEDAug 15 2019We present a direct Monte-Carlo determination of the scaling dimension of a topological defect operator in the infrared fixed point of a three-dimensional interacting quantum field theory. For this, we compute the free energy to introduce the background ... More
Probing $ΩΩ$ and $pΩ$ dibaryons with femtoscopic correlations in relativistic heavy-ion collisionsAug 15 2019The momentum correlation functions of baryon pairs, which reflects the baryon-baryon interaction at low energies, are investigated for multi-strangeness pairs ($\Omega\Omega$ and $N\Omega$) produced in relativistic heavy-ion collisions. We calculate the ... More
A curious behavior of three-dimensional lattice Dirac operators coupled to monopole backgroundAug 14 2019We investigate numerically the effect of regulating fermions in the presence of singular background fields in three dimensions. For this, we couple free lattice fermions to a background compact U(1) gauge field consisting of a monopole-anti-monopole pair ... More
Spin Structure of heavy-quark hybridsAug 14 2019Exotic quarkonia are candidates to new types of hadrons including four quarks or gluonic degrees of freedom as constituents, the latter being a unique feature of QCD. We review recent developments in nonrelativistic EFTs to describe exotic quarkonia and ... More
Nucleon-to-Resonance Form Factors at Large Photon VirtualitiesAug 14 2019We present a unified description of elastic and transition form factors involving the nucleon and its resonances; in particular, the $N(1440)$, $\Delta(1232)$ and $\Delta(1600)$. We compare predictions made using a framework built upon a Faddeev equation ... More
Safety versus triviality on the latticeAug 13 2019We present the first numerical study of the ultraviolet dynamics of non-asymptotically free gauge-fermion theories at large number of matter fields. As testbed theories we consider non-abelian SU(2) gauge theories with 24 and 48 Dirac fermions on the ... More
Phase structure of the 1+1 dimensional massive Thirring model from matrix product statesAug 13 2019Aug 21 2019Employing matrix product states as an ansatz, we study the non-thermal phase structure of the (1+1)-dimensional massive Thirring model in the sector of vanishing total fermion number with staggered regularization. In this paper, details of the implementation ... More
Phase structure of the 1+1 dimensional massive Thirring model from matrix product statesAug 13 2019Employing matrix product states as an ansatz, we study the non-thermal phase structure of the (1+1)-dimensional massive Thirring model in the sector of vanishing total fermion number with staggered regularization. In this paper, details of the implementation ... More
Propagator from Nonperturbative Worldline DynamicsAug 13 2019We use the worldline representation for correlation functions together with numerical path integral methods to extract nonperturbative information about the propagator to all orders in the coupling in the quenched limit (small-$N_{\text{f}}$ expansion). ... More
Accelerating lattice quantum field theory calculations via interpolator optimization using NISQ-era quantum computingAug 12 2019The only known way to study quantum field theories in non-perturbative regimes is using numerical calculations regulated on discrete space-time lattices. Such computations, however, are often faced with exponential signal-to-noise challenges that render ... More
Accelerating lattice quantum field theory calculations via interpolator optimization using NISQ-era quantum computingAug 12 2019Aug 13 2019The only known way to study quantum field theories in non-perturbative regimes is using numerical calculations regulated on discrete space-time lattices. Such computations, however, are often faced with exponential signal-to-noise challenges that render ... More
Complex Langevin Simulations of Supersymmetric Matrix ModelsAug 12 2019We investigate the possibility of spontaneous supersymmetry breaking in a class of N=2 supersymmetric matrix models, with complex actions, using complex Langevin dynamics and stochastic quantization. Our simulations successfully capture the presence or ... More
Numerical study of ADE-type $\mathcal{N}=2$ Landau--Ginzburg modelsAug 09 2019At an extremely low-energy scale, it is believed that the two-dimensional $\mathcal{N}=2$ Wess--Zumino model becomes an $\mathcal{N}=2$ superconformal field theory (SCFT). We study this theoretical conjecture of the Landau--Ginzburg (LG) description by ... More
Towards analog quantum simulations of lattice gauge theories with trapped ionsAug 08 2019Gauge field theories play a central role in modern physics and are at the heart of the Standard Model of elementary particles and interactions. Despite significant progress in applying classical computational techniques to simulate gauge theories, it ... More
QCD in the heavy dense regime for general $N_c$: On the existence of quarkyonic matterAug 08 2019Lattice QCD with heavy quarks reduces to a three-dimensional effective theory of Polyakov loops, which is amenable to series expansion methods. We analyse the effective theory in the cold and dense regime for a general number of colours, $N_c$. In particular, ... More
Chiral crossover characterized by Mott transition at finite temperatureAug 07 2019We discuss the proper definition for the chiral crossover at finite temperature, based on the Goldstone's theorem. Different from the usually used maximum change of chiral condensate, we propose to define the crossover temperature by the Mott transition ... More
Fractionalized Degrees of Freedom at Infinite Coupling in large Nf QED in 2+1 dimensionsAug 07 2019I consider quantum electrodynamics with many electrons in 2+1 space-time dimensions at finite temperature. The relevant dimensionless interaction parameter for this theory is the fine structure constant divided by the temperature. The theory is solvable ... More
Numerical exploration of three relativistic particles in a finite volume including two-particle resonances and bound statesAug 07 2019In this work, we use an extension of the quantization condition, given in Ref. [1], to numerically explore the finite-volume spectrum of three relativistic particles, in the case that two-particle subsets are either resonant or bound. The original form ... More
Meson condensationAug 06 2019We give a pedagogical review of the properties of the meson condensation phases triggered by a large isospin or strangeness imbalance. We argue that these phases are extremely interesting and powerful playground for exploring the properties of hadronic ... More
A cross-channel study of pion scattering from lattice QCDAug 05 2019We use a chiral model for pion interactions, in the inverse amplitude formalism, to perform a simultaneous analysis of lattice QCD results for pion-pion scattering in all three isospin channels. The input is the finite-volume two-pion spectrum computed ... More
Large-size expansion for triangular Wilson loops in confining gauge theoriesAug 05 2019The asymptotic behavior of Wilson loops in the large-size limit ($L\rightarrow\infty$) in confining gauge theories with area law is controlled by effective string theory (EST). The $L^{-2}$ term of the large-size expansion for the logarithm of Wilson ... More
Topological susceptibilty in lattice QCD with exact chiral symmetry -- the index of overlap-Dirac operator versus the clover topological charge in Wilson flowAug 05 2019Using an ensemble of 535 gauge configurations (on the $24^4 \times 48 $ lattice with $ a \simeq 0.06 $~fm and $ M_{\pi} \simeq 260 $~MeV) which are generated by hybrid Monte Carlo (HMC) simulation of $N_f=2$ lattice QCD with the optimal domain-wall quark, ... More
On the discrete Wigner function for SU(N)Aug 03 2019We present a self-consistent theoretical framework for finite-dimensional discrete phase spaces that leads us to establish a well-grounded mapping scheme between Schwinger unitary operators and generators of the special unitary group $\mathrm{SU(N)}$. ... More
On the discrete Wigner function for SU(N)Aug 03 2019Aug 17 2019We present a self-consistent theoretical framework for finite-dimensional discrete phase spaces that leads us to establish a well-grounded mapping scheme between Schwinger unitary operators and generators of the special unitary group $\mathrm{SU(N)}$. ... More
The Dilaton Potential and Lattice DataAug 02 2019We study an effective field theory (EFT) describing the interaction of an approximate dilaton with a set of pseudo-Nambu-Goldstone bosons (pNGBs). The EFT is inspired by, and employed to analyse, recent results from lattice calculations that reveal the ... More
Topological vacuum structure of the Schwinger model with matrix product statesAug 01 2019We numerically study the single-flavour Schwinger model in the Hamiltonian formulation with a topological $\theta$-term corresponding to a constant electric background field. By using numerical methods based on tensor networks, especially the one-dimensional ... More
Indirect Detection of Composite (Asymmetric) Dark MatterAug 01 2019Dark Matter can form bound states upon the emission of quanta of energy equal to the binding energy. The rate of this process is large for strongly-interacting Dark Matter, and further enhanced by long distance effects. The resulting monochromatic and ... More
Infrared renormalon in the supersymmetric $\mathbb{C}P^{N-1}$ model on $\mathbb{R}\times S^1$Aug 01 2019In the leading order of the large $N$ approximation, we study the renormalon ambiguity in the gluon (or more appropriately, photon) condensate in the two-dimensional supersymmetric $\mathbb{C}P^{N-1}$ model on~$\mathbb{R}\times S^1$ with the $\mathbb{Z}_N$ ... More
Infrared renormalon in the supersymmetric $\mathbb{C}P^{N-1}$ model on $\mathbb{R}\times S^1$Aug 01 2019Aug 16 2019In the leading order of the large $N$ approximation, we study the renormalon ambiguity in the gluon (or more appropriately, photon) condensate in the two-dimensional supersymmetric $\mathbb{C}P^{N-1}$ model on~$\mathbb{R}\times S^1$ with the $\mathbb{Z}_N$ ... More
Tensor network approach to real-time path integralJul 31 2019We present a tensor network representation of the path integral for the one-component real scalar field theory in 1+1 dimensional Minkowski space-time. It is numerically verified by comparing with the exact result in the non-interacting case.
Hyperon couplings from $N_f = 2 + 1$ lattice QCDJul 31 2019Aug 01 2019We compute various (generalized) isovector charges of the octet baryons. These include $g_A$, $g_T$ and $g_S$ as well as the unpolarized, polarized and transversity parton distribution function (PDF) momentum fractions $\langle x\rangle_{u^+-d^+}$, $\langle ... More
Hyperon couplings from $N_f = 2 + 1$ lattice QCDJul 31 2019We compute various (generalized) isovector charges of the octet baryons. These include $g_A$, $g_T$ and $g_S$ as well as the unpolarized, polarized and transversity parton distribution function (PDF) momentum fractions $\langle x\rangle_{u^+-d^+}$, $\langle ... More
Global parameterization of $ππ$ scattering up to 2 \gevJul 30 2019We provide global parameterizations of $\pi\pi$ scattering $S0$ and $P$ partial waves up to roughly 2 GeV for phenomenological use. These parameterizations describe the output and uncertainties of previous partial-wave dispersive analyses of $\pi\pi$, ... More
Real time dynamics quantum simulation of (1+1)-D lattice QED with Rydberg atomsJul 29 2019We show how to implement a Rydberg-atom quantum simulator to study the non-equilibrium dynamics of an Abelian (1+1)-D lattice gauge theory. The implementation locally codifies the degrees of freedom of a $\mathbf{Z}_3$ gauge field, once the matter field ... More
Updating and Optimizing Error PDFs in the Hessian Approach. Part IIJul 29 2019In an earlier publication, we introduced the software package, {\tt \texttt{ePump}} (error PDF Updating Method Package), that can be used to update or optimize a set of parton distribution functions (PDFs), including the best-fit PDF set and Hessian eigenvector ... More
New way of collision experiment data analysis based on Canonical Distribution and Lattice QCD dataJul 28 2019We propose new way of collision experiment data analysis. We analyze physical parameters of fireball created in RHIC experiment based on Grand Canonical Distribution and different Lattice QCD data available at the moment. Our results on chemical potential ... More
New way of collision experiment data analysis based on Grand Canonical Distribution and Lattice QCD dataJul 28 2019Aug 06 2019We propose new way of heavy ion collisions experiment data analysis. We analyze physical parameters of fireball created in RHIC experiment based on Grand Canonical Distribution and different Lattice QCD data available at the moment. Our results on chemical ... More
Excited-state effects in nucleon structure on the lattice using hybrid interpolatorsJul 27 2019It would be very useful to find a way of reducing excited-state effects in lattice QCD calculations of nucleon structure that has a low computational cost. We explore the use of hybrid interpolators, which contain a nontrivial gluonic excitation, in a ... More
Thermodynamic Geometry of the Quark-Meson ModelJul 26 2019We study the thermodynamic geometry of the Quark-Meson model, focusing on the curvature, $R$, around the chiral crossover at finite temperature and baryon chemical potential. We find a peculiar behavior of $R$ in the crossover region, in which the sign ... More
Determination of the QCD coupling from the static energy and the free energyJul 26 2019We present two determinations of the strong coupling \(\alpha_s\). The first one is from the static energy at three-loop accuracy, and may be considered an update of earlier determinations by some of us. The new analysis includes new lattice data at smaller ... More
Large $N_c$ scaling of meson masses and decay constantsJul 26 2019We perform an $\textit{ab initio}$ calculation of the $N_c$ scaling of the low-energy couplings of the chiral Lagrangian of low-energy strong interactions, extracted from the mass dependence of meson masses and decay constants. We compute these observables ... More
Thermodynamics of Antiferromagnetic Solids in Magnetic FieldsJul 26 2019We analyze the thermodynamic properties of antiferromagnetic solids subjected to a combination of mutually orthogonal uniform magnetic and staggered fields. Low-temperature series for the pressure, order parameter and magnetization up to two-loop order ... More
Application of the Thomas Fermi Quark Model to Multiquark MesonsJul 25 2019The possibility of the existence of mesons with two or more quark-antiquark pairs is investigated with a new application of the Thomas-Fermi (TF) statistical quark model. Quark color couplings are treated in a mean field manner similar to a previous application ... More
Model independent determination of the spins of the $P_{c}$(4440) and $P_{c}$(4457) from the spectroscopy of the triply charmed dibaryonsJul 25 2019The LHCb collaboration has recently observed three narrow pentaquark states --- the $P_c(4312)$, $P_c(4440)$, and $P_c(4457)$ ---that are located close to the $\bar{D} \Sigma_c$ and $\bar{D}^* \Sigma_c$ thresholds. Among the so-far proposed theoretical ... More
Precision calculations of $B \to V$ form factors in QCDJul 25 2019Applying the vacuum-to-$B$-meson correlation functions with an interpolating current for the light vector meson we construct the light-cone sum rules (LCSR) for the "effective" form factors $\xi_{\parallel}(n \cdot p)$, $\xi_{\perp}(n \cdot p)$, $\Xi_{\parallel}(\tau, ... More
Finite size effect on vector meson and baryon sectors in 2+1 flavor QCD at the physical pointJul 25 2019We investigate finite size effect on the vector meson and the baryon sectors using a subset of the "PACS10" configurations which are generated keeping the space-time volumes over (10 fm$)^4$ in 2+1 flavor QCD at the physical point. Comparing the results ... More
Constraining the gauge-fixed Lagrangian in minimal Landau gaugeJul 24 2019A continuum formulation of gauge-fixing resolving the Gribov-Singer ambiguity remains a challenge. Finding a Lagrangian formulation of operational resolutions in numerical lattice calculations, like minimal Landau gauge, would be one possibility. Such ... More
Complex Langevin and other approaches to the sign problem in quantum many-body physicsJul 24 2019We review the theory and applications of complex stochastic quantization to the quantum many-body problem. Along the way, we present a brief overview of a number of ideas that either ameliorate or in some cases altogether solve the sign problem, including ... More
The generalised infrared structure of the gluon propagatorJul 23 2019Gauge theory correlators are potentially more singular in the infrared than those in non-gauge theories. We determine the implications that these singularities have on the spectrum of the theory, proving that the appearance of generalised poles implies ... More
Spectral functions and critical dynamics of the $O(4)$ model from classical-statistical lattice simulationsJul 23 2019We calculate spectral functions of the relativistic $O(4)$ model from real-time lattice simulations in classical-statistical field theory. While in the low and high temperature phase of the model, the spectral functions of longitudinal $(\sigma)$ and ... More
Extraction of multiple exponential signals from lattice correlation functionsJul 23 2019We present a fast and simple algorithm that allows the extraction of multiple exponential signals from the temporal dependence of correlation functions evaluated on the lattice including the statistical fluctuations of each signal and treating properly ... More
Extraction of multiple exponential signals from lattice correlation functionsJul 23 2019Aug 06 2019We present a fast and simple algorithm that allows the extraction of multiple exponential signals from the temporal dependence of correlation functions evaluated on the lattice including the statistical fluctuations of each signal and treating properly ... More
Cold QCD at finite isospin density: confronting effective models with recent lattice dataJul 23 2019We compute the QCD equation of state for zero temperature and finite isospin density within the Nambu-Jona-Lasinio model in the mean field approximation, motivated by the recently obtained Lattice QCD results for a new class of compact stars: pion stars. ... More
Cold QCD at finite isospin density: confronting effective models with recent lattice dataJul 23 2019Aug 07 2019We compute the QCD equation of state for zero temperature and finite isospin density within the Nambu-Jona-Lasinio model in the mean field approximation, motivated by the recently obtained Lattice QCD results for a new class of compact stars: pion stars. ... More
Discrete Lorentz symmetry and discrete spacetime translational symmetry in two- and three-dimensional crystalsJul 23 2019As is well known, crystals have discrete space translational symmetry. It was recently noticed that one-dimensional crystals possibly have discrete Poincar\'{e} symmetry, which contains discrete Lorentz and discrete time translational symmetry as well. ... More
Parton distribution functions of $Δ^+$ on the latticeJul 23 2019We present results for renormalized matrix elements related to the unpolarized quasi-distribution function of the $\Delta^+$ baryon making use of the large momentum effective theory. Two ensembles of $N_f=2+1+1$ twisted mass fermions with a clover term ... More
Dependence of the static quark free energy on $μ_B$ and the crossover temperature of $N_f = 2+1$ QCDJul 22 2019We study the dependence of the static quark free energy on the baryon chemical potential for $N_f = 2+1$ QCD with physical quark masses, in a range of temperature spanning from 120~MeV up to 1~GeV and adopting a stout staggered discretization with two ... More
Calculating the EoS of the dense quark-gluon plasma using the Complex Langevin equationJul 19 2019The pressure and energy density of the quark-gluon plasma at finite baryon chemical potential are calculated using the Complex Langevin equation. The stout smearing procedure is generalized for the SL(3,$\mathcal{C}$) manifold allowing the usage of an ... More
A scaling hypothesis for matrix product statesJul 19 2019We revisit the question of describing critical spin systems and field theories using matrix product states, and formulate a scaling hypothesis in terms of operators, eigenvalues of the transfer matrix, and lattice spacing in the case of field theories. ... More
Pion and Kaon Structure at the Electron-Ion ColliderJul 18 2019Understanding the origin and dynamics of hadron structure and in turn that of atomic nuclei is a central goal of nuclear physics. This challenge entails the questions of how does the roughly 1\,GeV mass-scale that characterizes atomic nuclei appear; why ... More
The $O(4)$ $φ^4$ model as an effective light meson theory: a lattice-continuum comparisonJul 18 2019We investigate the possibility of using the 4 dimensional $O(4)$ symmetric $\phi^4$ model as an effective theory for the sigma-pion system. We carry out lattice Monte Carlo simulations to establish the triviality bound in the case of explicitly broken ... More
The $XYZ$ states: experimental and theoretical status and perspectivesJul 17 2019The quark model was formulated in 1964 to classify mesons as bound states made of a quark-antiquark pair, and baryons as bound states made of three quarks. For a long time all known mesons and baryons could be classified within this scheme. Quantum Chromodynamics ... More
QCD effective charges and the structure function $F_{2}$ at small-$x$: Higher twist effectsJul 17 2019We consider the effect of higher twist operators of the Wilson operator product expansion in the structure function $F_{2}(x,Q^{2})$ at small-$x$, taking into account QCD effective charges whose infrared behavior is constrained by a dynamical mass scale. ... More
Unitarity Entropy Bound: Solitons and InstantonsJul 17 2019We show that non-perturbative entities such as solitons and instantons saturate bounds on entropy when the theory saturates unitarity. Simultaneously, the entropy becomes equal to the area of the soliton/instanton. This is strikingly similar to black ... More
A hadron-quark hybrid model reliable for the EoS in $μ_{B} \leq 400$ MeVJul 17 2019We present a simple version of hadron-quark hybrid (HQH) model. The model is composed of the simple independent quark model for QGP states and an improved version of volume-excluded HRG model for hadronic states. The improved version of volume-excluded ... More
Confinement-Deconfinement Crossover in the Lattice $\mathbb{C}P^{N-1}$ ModelJul 16 2019The $\mathbb{C}P^{N-1}$ sigma model at finite temperature is studied using lattice Monte Carlo simulations on $S_{s}^{1} \times S_{\tau}^{1}$ with radii $L_{s}$ and $L_{\tau}$, respectively, where the ratio of the circumferences is taken to be sufficiently ... More
Confinement-Deconfinement Crossover in the Lattice $\mathbb{C}P^{N-1}$ ModelJul 16 2019Aug 01 2019The $\mathbb{C}P^{N-1}$ sigma model at finite temperature is studied using lattice Monte Carlo simulations on $S_{s}^{1} \times S_{\tau}^{1}$ with radii $L_{s}$ and $L_{\tau}$, respectively, where the ratio of the circumferences is taken to be sufficiently ... More
Mass spectrum of the hidden-charm pentaquarks in the compact diquark modelJul 15 2019The LHCb collaboration have recently updated their analysis of the resonant $J/\psi p$ mass spectrum in the decay $\Lambda_b^0 \to J/\psi p K^-$, making use of their combined Run 1 and Run 2 data. In the updated analysis, three narrow states, $P_c (4440)^+$, ... More
Baryon-baryon interactions at short distances -- constituent quark model meets lattice QCDJul 15 2019Jul 19 2019The interaction energies between two baryons at short distance in different flavor channels are calculated from the constituent quark model (CQM) and are compared with the recent lattice QCD (LQCD) results for baryon-baryon potentials at short distance. ... More
Baryon-baryon interactions at short distances -- constituent quark model meet lattice QCDJul 15 2019The interaction energies between two baryons at short distance in different flavor channels are calculated from the constituent quark model (CQM) and are compared with the recent lattice QCD (LQCD) results for baryon-baryon potentials at short distance. ... More
Parton distributions from lattice data: the nonsinglet caseJul 13 2019We revise the relation between Parton Distribution Functions (PDFs) and matrix elements computable from lattice QCD, focusing on the quasi-Parton Distribution Functions (qPDFs) approach. We exploit the relation between PDFs and qPDFs in the case of the ... More
Parton distributions from lattice data: the nonsinglet caseJul 13 2019Jul 26 2019We revise the relation between Parton Distribution Functions (PDFs) and matrix elements computable from lattice QCD, focusing on the quasi-Parton Distribution Functions (qPDFs) approach. We exploit the relation between PDFs and qPDFs in the case of the ... More
Highly occupied gauge theories in 2+1 dimensions: self-similar attractorJul 12 2019Motivated by the boost-invariant Glasma state in the initial stages in heavy-ion collisions, we perform classical-statistical simulations of SU(2) gauge theory in 2+1 dimensional space-time both with and without a scalar field in the adjoint representation. ... More
On the Cottingham formula and the electromagnetic contribution to the proton-neutron mass splittingJul 11 2019The excess mass of the neutron over the proton arises from two sources within the Standard Model, electromagnetism and the splitting of the down and up quark masses. The Cottingham Formula provides a means of determining the QED corrections from the forward ... More
Five-flavor pentaquarks and other light- and heavy-flavor symmetry partners of the LHCb hidden-charm pentaquarkJul 11 2019The recent discovery of three pentaquark peaks --- the $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$ --- by the LHCb collaboration has a series of interesting consequences for hadron spectroscopy. If these hidden-charm objects are indeed hadronic molecules, ... More
Scale setting for QCD with Nf=3+1 dynamical quarksJul 09 2019We present first results of the scale setting for QCD with Nf=3+1 dynamical quarks on the lattice. We use a recently proposed massive renormalization scheme with a non-perturbatively determined clover coefficient. To relate the bare coupling of the simulations ... More
Scale setting for QCD with Nf=3+1 dynamical quarksJul 09 2019Aug 08 2019We present first results of the scale setting for QCD with Nf=3+1 dynamical quarks on the lattice. We use a recently proposed massive renormalization scheme with a non-perturbatively determined clover coefficient. To relate the bare coupling of the simulations ... More
Decay modes of the scalar exotic meson $T_{bs;\overline{u}\overline{d}}^{-}$Jul 09 2019We investigate the semileptonic decay of the scalar tetraquark $T_{bs; \overline{u}\overline{d}}^{-}$ to final state $T_{cs;\overline{u}\overline{d} }^{0} l \overline{\nu}_l$, which proceeds due to the weak transition $b \to c l \overline{\nu}_l$. For ... More
Structure Factors of The Unitary Gas Under Supernova ConditionsJul 09 2019Jul 10 2019We compute with lattice field theory the vector and axial static structure factors of the unitary gas for arbitrary temperature above the superfluid transition and for fugacities 0.1 < z < 1.0. Using the lattice formulation, we calculate beyond the validity ... More
Structure Factors of The Unitary Gas Under Supernova ConditionsJul 09 2019We compute with lattice field theory the vector and axial static structure factors of the unitary gas for arbitrary temperature above the superfluid transition and for fugacities 0.1 < z < 1.0. Using the lattice formulation, we calculate beyond the validity ... More
Linearly polarized gluons at next-to-next-to leading order and the Higgs transverse momentum distributionJul 08 2019We calculate the small-b (or large-qT) matching of transverse momentum dependent (TMD) distribution for linearly polarized gluons to the integrated gluon distributions at the next-to-next-to-leading order (NNLO). This is the last missing part for the ... More
A coupled-channel lattice study on the resonance-like structure $Z_c(3900)$Jul 08 2019In this exploratory study, near-threshold scattering of $D$ and $\bar{D}^*$ meson is investigated using lattice QCD with $N_f=2+1+1$ twisted mass fermion configurations. The calculation is performed within the coupled-channel L\"uscher's finite-size formalism. ... More
A coupled-channel lattice study on the resonance-like structure $Z_c(3900)$Jul 08 2019Aug 12 2019In this exploratory study, near-threshold scattering of $D$ and $\bar{D}^*$ meson is investigated using lattice QCD with $N_f=2+1+1$ twisted mass fermion configurations. The calculation is performed within the coupled-channel L\"uscher's finite-size formalism. ... More
Evidence against naive truncations of the OPE from $e^+e^- \to$ hadrons below charmJul 07 2019The operator product expansion (OPE), truncated in dimension, is employed in many contexts. An example is the extraction of the strong coupling, $\alpha_s$, from hadronic $\tau$-decay data, using a variety of analysis methods based on finite-energy sum ... More
$Nπ$-excited state contamination in nucleon 3-point functions using ChPTJul 07 2019The $N\pi$-state contribution to nucleon 3-pt functions involving the pseudoscalar density $P(x)$ and the time component $A_4(x)$ of the axial vector current are computed to LO in ChPT. In case of the latter the $N\pi$ contribution is O($M_N$) enhanced ... More
New $N_f=2$ Pseudofermion Action for Monte-Carlo Simulation of Lattice Field Theory with Domain-Wall FermionsJul 07 2019We construct a novel $ N_f = 2 $ pseudofermion action for Monte-Carlo simulation of lattice gauge theory with domain-wall fermions (DWF), of which the effective four-dimensional lattice Dirac operator is equal to the overlap-Dirac operator with the argument ... More
Lattice methods for students at a formal TASIJul 05 2019These lectures about lattice field theory were written for, and given at, TASI 2019, ``The many dimensions of quantum field theory.'' The students at this TASI were mostly interested in formal things, and so these are slightly unusual lattice lectures: ... More
Interplay between $SU(N_f)$ chiral symmetry, $U(1)_A$ axial anomaly and massless bosonsJul 03 2019The standard wisdom on the origin of massless bosons in the spectrum of a Quantum Field Theory $(QFT)$ describing the interaction of gauge fields coupled to matter fields is based on two well known features: gauge symmetry, and spontaneous symmetry breaking ... More
Anisotropic string tensions and inversely magnetic catalyzed deconfinement from a dynamical AdS/QCD modelJul 03 2019We extend previous work on dynamical AdS/QCD models by introducing an extra ingredient under the form of a background magnetic field, this to gain insight into the influence such field can have on crucial QCD observables. Therefore, we construct a closed ... More
Three regimes of QCDJul 03 2019While the QCD Lagrangian as the whole is only chirally symmetric, its electric part has larger chiral-spin SU(2)_{CS} and SU(2N_F) symmetries. This allows separation of the electric and magnetic interactions in a given reference frame. An artificial truncation ... More
Thermal behaviors of light scalar resonances at low temperaturesJul 03 2019We study the thermal properties of the lowest multiplet of the QCD light-flavor scalar resonances, including the $f_0(500)/\sigma$, $K_{0}^{*}(700)/\kappa$, $f_0(980)$ and $a_0(980)$, in the framework of unitarized $U(3)$ chiral perturbation theory. After ... More
A Different Angle on Quantum Uncertainty (Measure Angle)Jul 02 2019The uncertainty associated with probing the quantum state is expressed as the effective abundance (measure) of possibilities for its collapse. New kinds of uncertainty limits entailed by quantum description of the physical system arise in this manner. ... More