Strong-Isospin Violation in the Neutron-Proton Mass Difference from Fully-Dynamical Lattice QCD and PQQCD

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dc.creatorBeane, Silas R.
dc.creatorOrginos, Kostas
dc.creatorSavage, Martin J.
dc.date2006-05-16
dc.date.accessioned2026-07-07T11:04:37Z
dc.date.available2026-07-07T11:04:37Z
dc.descriptionWe determine the strong-isospin violating component of the neutron-proton mass difference from fully-dynamical lattice QCD and partially-quenched QCD calculations of the nucleon mass, constrained by partially-quenched chiral perturbation theory at one-loop level. The lattice calculations were performed with domain-wall valence quarks on MILC lattices with rooted staggered sea-quarks at a lattice spacing of b=0.125 fm, lattice spatial size of L=2.5 fm and pion masses ranging from m_pi ~ 290 MeV to ~ 350 MeV. At the physical value of the pion mass, we predict M_n - M_p |(d-u) = 2.26 +- 0.57 +- 0.42 +- 0.10 MeV where the first error is statistical, the second error is due to the uncertainty in the ratio of light-quark masses, eta=m_u/m_d, determined by MILC, and the third error is an estimate of the systematic due to chiral extrapolation.
dc.description14 pages, 11 figures
dc.identifierhttps://arxiv.org/abs/hep-lat/0605014
dc.identifierhttp://arxiv.org/abs/hep-lat/0605014
dc.identifierNucl.Phys.B768:38-50,2007
dc.identifierdoi:10.1016/j.nuclphysb.2006.12.023
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/188951
dc.subjectHigh Energy Physics - Lattice
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectNuclear Theory
dc.titleStrong-Isospin Violation in the Neutron-Proton Mass Difference from Fully-Dynamical Lattice QCD and PQQCD
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