scholarly journals Scaling and low energy constants in lattice QCD with N_f = 2 maximally twisted Wilson quarks

2008 ◽  
Author(s):  
Gregorio Herdoiza ◽  
Roberto Frezzotti ◽  
Petros Dimopoulos ◽  
Carsten Urbach ◽  
Urs Wenger
Keyword(s):  
Lattice Qcd ◽  
Low Energy ◽  
Energy Constants

scholarly journals SU(2)low-energy constants from mixed-action lattice QCD

2012 ◽  
Vol 86 (9) ◽  
Author(s):  
S. R. Beane ◽  
W. Detmold ◽  
P. M. Junnarkar ◽  
T. C. Luu ◽  
K. Orginos ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Low Energy ◽  
Mixed Action ◽  
Energy Constants

scholarly journals Chiral Extrapolations of the ρ(770) Meson in Nf = 2 + 1 Lattice QCD Simulations

2018 ◽  
Vol 175 ◽  
pp. 05002
Author(s):  
R. Molina ◽  
B. Hu ◽  
M. Doering ◽  
M. Mai ◽  
A. Alexandru
Keyword(s):  
Lattice Qcd ◽  
Strange Quark ◽  
Low Energy ◽  
P Wave ◽  
Recent Analysis ◽  
Lattice Data ◽  
Physical Point ◽  
Decay Constants ◽  
Data Analyses ◽  
Energy Constants

Several lattice QCD simulations of meson-meson scattering in p-wave and Isospin = 1 in Nf = 2 + 1 flavours have been carried out recently. Unitarized Chiral Perturbation Theory is used to perform extrapolations to the physical point. In contrast to previous findings on the analyses of Nf = 2 lattice data, where most of the data seems to be in agreement, some discrepancies are detected in the Nf = 2 + 1 lattice data analyses, which could be due to different masses of the strange quark, meson decay constants, initial constraints in the simulation, or other lattice artifacts. In addition, the low-energy constants are compared to the ones from a recent analysis of Nf = 2 lattice data.

scholarly journals Light pseudoscalar decay constants, quark masses, and low energy constants from three-flavor lattice QCD

2004 ◽  
Vol 70 (11) ◽  
Author(s):  
C. Aubin ◽  
C. Bernard ◽  
C. DeTar ◽  
J. Osborn ◽  
Steven Gottlieb ◽  
...  
Keyword(s):  
Lattice Qcd ◽  
Low Energy ◽  
Decay Constants ◽  
Quark Masses ◽  
Energy Constants

scholarly journals New method for calculating electromagnetic effects in semileptonic beta-decays of mesons

2020 ◽  
Vol 2020 (10) ◽  
Author(s):  
Chien-Yeah Seng ◽  
Xu Feng ◽  
Mikhail Gorchtein ◽  
Lu-Chang Jin ◽  
Ulf-G. Meißner
Keyword(s):  
Perturbation Theory ◽  
Lattice Qcd ◽  
Beta Decay ◽  
Chiral Perturbation Theory ◽  
Low Energy ◽  
Matrix Elements ◽  
Chiral Perturbation ◽  
Electromagnetic Effects ◽  
Beta Decays ◽  
Energy Constants

Abstract We construct several classes of hadronic matrix elements and relate them to the low-energy constants in Chiral Perturbation Theory that describe the electromagnetic effects in the semileptonic beta decay of the pion and the kaon. We propose to calculate them using lattice QCD, and argue that such a calculation will make an immediate impact to a number of interesting topics at the precision frontier, including the outstanding anomalies in |Vus| and the top-row Cabibbo-Kobayashi-Maskawa matrix unitarity.

scholarly journals Precision computation of a low-energy reference scale in quenched lattice QCD

1998 ◽  
Vol 535 (1-2) ◽  
pp. 389-402 ◽  
Author(s):  
Marco Guagnelli ◽  
Rainer Sommer ◽  
Hartmut Wittig
Keyword(s):  
Lattice Qcd ◽  
Low Energy ◽  
Reference Scale

scholarly journals Higgs compositeness in Sp(2N) gauge theories – Determining the low-energy constants with lattice calculations

2018 ◽  
Vol 175 ◽  
pp. 08011 ◽  
Author(s):  
Ed Bennett ◽  
Deog Ki Hong ◽  
Jong-Wan Lee ◽  
C.-J. David Lin ◽  
Biagio Lucini ◽  
...  
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Effective Field ◽  
Higgs Model ◽  
Low Energy ◽  
Dirac Fermion ◽  
Global Symmetry ◽  
Composite Higgs ◽  
Lattice Calculations ◽  
Energy Constants

As a first step towards a quantitative understanding of the SU(4)/Sp(4) composite Higgs model through lattice calculations, we discuss the low energy effective field theory resulting from the SU(4) → Sp(4) global symmetry breaking pattern. We then consider an Sp(4) gauge theory with two Dirac fermion flavours in the fundamental representation on a lattice, which provides a concrete example of the microscopic realisation of the SU(4)/Sp(4) composite Higgs model. For this system, we outline a programme of numerical simulations aiming at the determination of the low-energy constants of the effective field theory and we test the method on the quenched theory. We also report early results from dynamical simulations, focussing on the phase structure of the lattice theory and a calculation of the lowest-lying meson spectrum at coarse lattice spacing.

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