This title appears in the Scientific Report :
2016
Please use the identifier:
http://hdl.handle.net/2128/12218 in citations.
Please use the identifier: http://dx.doi.org/10.1103/PhysRevLett.117.082001 in citations.
Up and Down Quark Masses and Corrections to Dashen’s Theorem from Lattice QCD and Quenched QED
Up and Down Quark Masses and Corrections to Dashen’s Theorem from Lattice QCD and Quenched QED
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 he...
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Personal Name(s): | Fodor, Z. |
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Hoelbling, C. / Krieg, S. / Lellouch, L. / Lippert, Th. / Portelli, A. / Sastre, A. / Szabo, Kalman / Varnhorst, L. | |
Contributing Institute: |
John von Neumann - Institut für Computing; NIC Jülich Supercomputing Center; JSC |
Published in: | Physical review letters, 117 (2016) 8, S. 082001 |
Imprint: |
College Park, Md.
APS
2016
|
DOI: |
10.1103/PhysRevLett.117.082001 |
PubMed ID: |
27588847 |
Document Type: |
Journal Article |
Research Program: |
Up and down quark masses from lattice QCD + QED Computational Science and Mathematical Methods |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1103/PhysRevLett.117.082001 in citations.
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. |