Light and strange quark masses for $N_f = 2 + 1$ simulations with Wilson fermions

We report recent efforts by CLS to generate an ensemble with physical lightand strange-quark masses in a lattice volume of 192 × 963 at β = 3:55 corresponding to a lattice spacing of 0:064 fm. This ensemble is being generated as part of the CLS 2+1 flavor effort with improved Wilson fermions. Our simulations currently cover 5 lattice spacings ranging from 0:039 fm to 0:086 fm at various pion masses along chiral trajectories with either the sum of the quark masses kept fixed, or with the strange-quark mass at the physical value. The current status of simulations is briefly reviewed, including a short discussion of measured autocorrelation times and of the main features of the simulations. We then proceed to discuss the thermalization strategy employed for the generation of the physical quark-mass ensemble and present first results for some simple observables. Challenges encountered in the simulation are highlighted.

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Remarks on strange-quark simulations with Wilson fermions

Physical Review D ◽

10.1103/physrevd.102.074506 ◽

2020 ◽

Vol 102 (7) ◽

Author(s):

Daniel Mohler ◽

Stefan Schaefer

Keyword(s):

Strange Quark ◽

Wilson Fermions

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DETERMINATION OF LIGHT QUARK MASSES IN QCD

International Journal of Modern Physics A ◽

10.1142/s0217751x10051116 ◽

2010 ◽

Vol 25 (29) ◽

pp. 5223-5234 ◽

Cited By ~ 5

Author(s):

C. A. DOMINGUEZ

Keyword(s):

Strange Quark ◽

Sum Rules ◽

Standard Procedure ◽

Light Quark ◽

Qcd Sum Rules ◽

Quark Masses ◽

Systematic Uncertainties ◽

Better Than ◽

The Ideal

The standard procedure to determine (analytically) the values of the quark masses is to relate QCD two-point functions to experimental data in the framework of QCD sum rules. In the case of the light quark sector, the ideal Green function is the pseudoscalar correlator which involves the quark masses as an overall multiplicative factor. For the past thirty years this method has been affected by systematic uncertainties originating in the hadronic resonance sector, thus limiting the accuracy of the results. Recently, a major breakthrough has been made allowing for a considerable reduction of these systematic uncertainties and leading to light quark masses accurate to better than 8%. This procedure will be described in this talk for the up-, down-, strange-quark masses, after a general introduction to the method of QCD sum rules.

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A Note on Koide’s Doubly Special Parametrization of Quark Masses

Open Physics ◽

10.1515/phys-2018-0058 ◽

2018 ◽

Vol 16 (1) ◽

pp. 427-429

Author(s):

Piotr Żenczykowski

Keyword(s):

Charged Lepton ◽

Strange Quark ◽

Scale Parameter ◽

Low Energy ◽

Quark Masses ◽

Quark Sector ◽

Energy Regime ◽

Two Parameters

Abstract Three charged lepton masses may be expressed in terms of a Z3-symmetric parametrization relevant for the discussion of Koide’s formula. After disregarding the overall scale parameter, the observed pattern of lepton masses can be described extremely well if the remaining two parameters acquire the unexpectedly simple values of 1 and 2/9. We argue that an analogue of this doubly special feature of the parametrization can also be seen in the quark sector provided that the mass of the strange quark is taken to be around 160 MeV, as might be expected in the low-energy regime.

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LIGHT QUARK MASSES FROM QCD SUM RULES

Modern Physics Letters A ◽

10.1142/s021773231360016x ◽

2013 ◽

Vol 28 (26) ◽

pp. 1360016 ◽

Cited By ~ 2

Author(s):

KARL SCHILCHER

Keyword(s):

Quark Mass ◽

Strange Quark ◽

Sum Rules ◽

Light Quark ◽

Finite Energy ◽

Qcd Sum Rules ◽

Sum Rule ◽

Quark Masses ◽

Strange Quark Mass

Recent QCD sum rule determinations of the light quark masses are reviewed. In the case of the strange quark mass, possible uncertainties are discussed in the framework of finite energy sum rules.

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