scholarly journals Confirming the existence of the strong CP problem in lattice QCD with the gradient flow

2021 ◽  
Vol 103 (1) ◽  
Author(s):  
Jack Dragos ◽  
Thomas Luu ◽  
Andrea Shindler ◽  
Jordy de Vries ◽  
Ahmed Yousif
Keyword(s):  
Lattice Qcd ◽  
Gradient Flow

scholarly journals Expansion coefficient of the pseudo-scalar density using the gradient flow in lattice QCD

2019 ◽  
Author(s):  
Jose Gabriel Reyes Rivera ◽  
Jack Dragos ◽  
Jangho Kim ◽  
Andrea Shindler ◽  
Thomas Luu
Keyword(s):  
Lattice Qcd ◽  
Expansion Coefficient ◽  
Gradient Flow ◽  
Scalar Density ◽  
Pseudo Scalar

scholarly journals Nucleon axial coupling from Lattice QCD

2018 ◽  
Vol 175 ◽  
pp. 01008 ◽  
Author(s):  
Chia Cheng Chang ◽  
Amy Nicholson ◽  
Enrico Rinaldi ◽  
Evan Berkowitz ◽  
Nicolas Garron ◽  
...  
Keyword(s):  
Domain Wall ◽  
Lattice Qcd ◽  
Present State ◽  
Correlation Functions ◽  
State Of The Art ◽  
Gradient Flow ◽  
Relative Uncertainty ◽  
Domain Wall Fermions ◽  
Flow Algorithm ◽  
Point Correlation

We present state-of-the-art results from a lattice QCD calculation of the nucleon axial coupling, gA, using Möbius Domain-Wall fermions solved on the dynamical Nf = 2 + 1 + 1 HISQ ensembles after they are smeared using the gradient-flow algorithm. Relevant three-point correlation functions are calculated using a method inspired by the Feynman-Hellmann theorem, and demonstrate significant improvement in signal for fixed stochastic samples. The calculation is performed at five pion masses of mπ ~ {400, 350, 310, 220, 130} MeV, three lattice spacings of a ~ {0.15, 0.12, 0.09} fm, and we do a dedicated volume study with mπL ~ {3.22, 4.29, 5.36}. Control over all relevant sources of systematic uncertainty are demonstrated and quantified. We achieve a preliminary value of gA = 1.285(17), with a relative uncertainty of 1.33%.

scholarly journals Finite continuum quasi distributions from lattice QCD

2018 ◽  
Vol 175 ◽  
pp. 06004
Author(s):  
Christopher Monahan ◽  
Kostas Orginos
Keyword(s):  
Lattice Qcd ◽  
Wilson Line ◽  
Gradient Flow ◽  
Matrix Elements ◽  
Spatial Direction ◽  
New Approach ◽  
Nonperturbative Method ◽  
Extended Operator ◽  
Power Divergence ◽  
The Continuum

We present a new approach to extracting continuum quasi distributions from lattice QCD. Quasi distributions are defined by matrix elements of a Wilson-line operator extended in a spatial direction, evaluated between nucleon states at finite momentum. We propose smearing this extended operator with the gradient flow to render the corresponding matrix elements finite in the continuum limit. This procedure provides a nonperturbative method to remove the power-divergence associated with the Wilson line and the resulting matrix elements can be directly matched to light-front distributions via perturbation theory.

Onset Transition to Cold Nuclear Matter from Lattice QCD with Heavy Quarks

2014 ◽  
Author(s):  
Mathias Neuman ◽  
Jens Langelage ◽  
Owe Philipsen
Keyword(s):  
Nuclear Matter ◽  
Lattice Qcd ◽  
Heavy Quarks ◽  
Cold Nuclear Matter

scholarly journals Neutron electric dipole moment using lattice QCD simulations at the physical point

2021 ◽  
Vol 103 (5) ◽  
Author(s):  
C. Alexandrou ◽  
A. Athenodorou ◽  
K. Hadjiyiannakou ◽  
A. Todaro
Keyword(s):  
Dipole Moment ◽  
Lattice Qcd ◽  
Electric Dipole Moment ◽  
Electric Dipole ◽  
Neutron Electric Dipole Moment ◽  
Physical Point
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