Hauptseite > Publikationsdatenbank > Up and Down Quark Masses and Corrections to Dashen’s Theorem from Lattice QCD and Quenched QED > print

001     817800
005     20210129224029.0
024 7 _ |a 10.1103/PhysRevLett.117.082001
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024 7 _ |a 1079-7114
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100 1 _ |a Fodor, Z.
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245 _ _ |a Up and Down Quark Masses and Corrections to Dashen’s Theorem from Lattice QCD and Quenched QED
260 _ _ |a College Park, Md.
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520 _ _ |a In a previous Letter [Borsanyi et al., Phys. Rev. Lett. 111, 252001 (2013)] we determined the isospin mass splittings of the baryon octet from a lattice calculation based on Nf=2+1 QCD simulations to which QED effects have been added in a partially quenched setup. Using the same data we determine here the corrections to Dashen’s theorem and the individual up and down quark masses. Our ensembles include 5 lattice spacings down to 0.054 fm, lattice sizes up to 6 fm, and average up-down quark masses all the way down to their physical value. For the parameter which quantifies violations to Dashen’s theorem, we obtain ϵ=0.73(2)(5)(17), where the first error is statistical, the second is systematic, and the third is an estimate of the QED quenching error. For the light quark masses we obtain, mu=2.27(6)(5)(4) and md=4.67(6)(5)(4)  MeV in the modified minimal subtraction scheme at 2  GeV and the isospin breaking ratios mu/md=0.485(11)(8)(14), R=38.2(1.1)(0.8)(1.4), and Q=23.4(0.4)(0.3)(0.4). Our results exclude the mu=0 solution to the strong CP problem by more than 24 standard deviations.
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536 _ _ |a Up and down quark masses from lattice QCD + QED (hjs00_20151101)
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700 1 _ |a Hoelbling, C.
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700 1 _ |a Portelli, A.
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700 1 _ |a Sastre, A.
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700 1 _ |a Szabo, Kalman
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700 1 _ |a Varnhorst, L.
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773 _ _ |a 10.1103/PhysRevLett.117.082001
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