Showing 2019 · hep-latShow all

40 papers · 2 filters

hep-lat2019★ 14 cited

Towards a semi-classical description of QCD vacuum around

Rasmus N. Larsen, Sayantan Sharma, Edward Shuryak

We study the vacuum topology of 2+1 flavor QCD above the chiral crossover transition, at , on lattices of size . Since overlap fermions have exact…

hep-lat2019★ 1 cited

Heavy quark momentum diffusion coefficient from the lattice

Nora Brambilla, Viljami Leino, Peter Petreczky +1

We report progress towards computing the heavy quark momentum diffusion coefficient from the lattice correlator of two chromoelectric fields attached to a Polyakov loop in pure SU(…

hep-lat2019★ 10 cited

Nucleon Mass with Highly Improved Staggered Quarks

Yin Lin, Aaron S. Meyer, Ciaran Hughes +3

We present the first computation in a program of lattice-QCD baryon physics using staggered fermions for sea and valence quarks. For this initial study, we present a calculation of…

hep-lat2019★ 433 cited

The hadronic light-by-light scattering contribution to the muon anomalous magnetic moment from lattice QCD

Thomas Blum, Norman Christ, Masashi Hayakawa +4

We report the first result for the hadronic light-by-light scattering contribution to the muon anomalous magnetic moment with all errors systematically controlled. Several ensemble…

hep-lat2019★ 35 cited

Lattice QCD calculation of the pion charge radius using a model-independent method

Xu Feng, Yang Fu, Lu-Chang Jin

We use a method to calculate the hadron's charge radius without model-dependent momentum extrapolations. The method does not require the additional quark propagator inversions on t…

hep-lat2019★ 13 cited

Nucleon mass and isovector couplings in 2+1-flavor dynamical domain-wall lattice QCD near physical mass

Michael Abramczyk, Thomas Blum, Taku Izubuchi +5

We report nucleon mass, isovector vector and axial-vector charges, and tensor and scalar couplings, calculated using two recent 2+1-flavor dynamical domain-wall fermions lattice-QC…

hep-lat2019★ 63 cited

Nonperturbative renormalization of staple-shaped Wilson line operators in lattice QCD

Phiala Shanahan, Michael L. Wagman, Yong Zhao

Quark bilinear operators with staple-shaped Wilson lines are used to study transverse-momentum-dependent parton distribution functions (TMDPDFs) from lattice quantum chromodynamics…

hep-lat2019★ 2 cited

Exclusive Channel Study of the Muon HVP

Mattia Bruno, Taku Izubuchi, Christoph Lehner +1

The Hadronic Vacuum Polarization (HVP) is a dominant contribution to the theoretical uncertainty of the muon anomalous magnetic moment. The uncertainty in a lattice QCD calculation…

hep-lat2019★ 64 cited

Excited bottomonia in quark-gluon plasma from lattice QCD

Rasmus Larsen, Stefan Meinel, Swagato Mukherjee +1

We present the first lattice QCD study of up to and bottomonia at non-zero temperatures. Correlation functions of bottomonia were computed using novel bottomonium operato…

hep-lat2019★ 41 cited

Long-distance Contributions to Neutrinoless Double Beta Decay

Xin-Yu Tuo, Xu Feng, Lu-Chang Jin

Neutrinoless double beta decay, if detected, would prove that neutrinos are Majorana fermions and provide the direct evidence for lepton number violation. If such decay would exist…

hep-lat2019★ 38 cited

Numerical determination of monopole scaling dimension in parity-invariant three-dimensional non-compact QED

Nikhil Karthik, Rajamani Narayanan

We 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…

hep-lat2019★ 110 cited

Meson Screening Masses in (2+1)-Flavor QCD

Alexei Bazavov, Simon Dentinger, Heng-Tong Ding +13

We present lattice QCD results for mesonic screening masses in the temperature range 140 MeV 2500 MeV. Our calculations were carried out using (2+1)-flavors o…

hep-lat2019★ 9 cited

Axial U(1) symmetry, topology, and Dirac spectra at high temperature in lattice QCD

Kei Suzuki, Sinya Aoki, Yasumichi Aoki +3

Using lattice QCD simulations with dynamical fermions, we study the axial symmetry, topological charge, and Dirac eigenvalue spectra in the high-temperature phase…

hep-lat2019★ 2 cited

A curious behavior of three-dimensional lattice Dirac operators coupled to monopole background

Nikhil Karthik, Rajamani Narayanan

We 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 backg…

hep-lat2019★ 55 cited

Thermal Broadening of Bottomonia: Lattice Non-Relativistic QCD with Extended Operators

Rasmus Larsen, Stefan Meinel, Swagato Mukherjee +1

We present lattice non-relativistic QCD calculations of bottomonium correlation functions at temperatures MeV. The correlation functions were computed using exte…

hep-lat2019★ 5 cited

Excited-state effects in nucleon structure on the lattice using hybrid interpolators

Jeremy R. Green, Michael Engelhardt, Nesreen Hasan +5

It 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 hy…

hep-lat2019★ 62 cited

Determination of the QCD coupling from the static energy and the free energy

Alexei Bazavov, Nora Brambilla, Xavier Garcia i Tormo +4

We present two determinations of the strong coupling \(α_s\). The first one is from the static energy at three-loop accuracy, and may be considered an update of earlier determinati…

hep-lat2019★ 2 cited

Radiative leptonic decays on the lattice

Christopher Kane, Christoph Lehner, Stefan Meinel +1

Adding a hard photon to the final state of a leptonic pseudoscalar-meson decay lifts the helicity suppression and can provide sensitivity to a larger set of operators in the weak e…

hep-lat2019★ 59 cited

Nucleon Electromagnetic Form Factors in the Continuum Limit from 2+1+1-flavor Lattice QCD

Yong-Chull Jang, Rajan Gupta, Huey-Wen Lin +2

Results are presented for the nucleon isovector electromagnetic form factors using 11 ensembles generated by the MILC collaboration using the 2+1+1-flavors HISQ action. They span 4…

hep-lat2019★ 1 cited

Chiral phase transition in (2 + 1)-flavor QCD

Heng-Tong Ding, Prasad Hegde, Olaf Kaczmarek +5

The chiral phase transition temperature is a fundamental quantity of QCD. To determine this quantity we have performed simulations of (2 + 1)-flavor QCD using the Highl…

hep-lat2019★ 131 cited

Light quark vacuum polarization at the physical point and contribution to the muon

Christopher Aubin, Thomas Blum, Cheng Tu +3

We report on the computation of the connected light quark vacuum polarization with 2+1+1 flavors of HISQ fermions at the physical point and its contribution to the muon anomalous m…

hep-lat2019★ 113 cited

Axial Vector Form Factors from Lattice QCD that Satisfy the PCAC Relation

Yong-Chull Jang, Rajan Gupta, Boram Yoon +1

Previous lattice QCD calculations of axial vector and pseudoscalar form factors show significant deviation from the partially conserved axial current (PCAC) relation between them.…

hep-lat2019★ 126 cited

Valence parton distribution function of pion from fine lattice

Taku Izubuchi, Luchang Jin, Christos Kallidonis +5

We present a lattice QCD study of valence parton distribution inside the pion within the framework of Large Momentum Effective Theory. We use a mixed action approach with 1-HYP sme…

hep-lat2019★ 25 cited

Lattice Gauge Theory for Physics Beyond the Standard Model

Richard C. Brower, Anna Hasenfratz, Ethan T. Neil +7

This document is one of a series of whitepapers from the USQCD collaboration. Here, we discuss opportunities for lattice field theory research to make an impact on models of new ph…