Is strong CP invariance due to a massless up quark?

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dc.creatorNelson, Daniel R.
dc.creatorFleming, George T.
dc.creatorKilcup, Gregory W.
dc.date2001-12-18
dc.date2002-08-26
dc.date.accessioned2026-07-07T10:32:31Z
dc.date.available2026-07-07T10:32:31Z
dc.descriptionA standing mystery in the Standard Model is the unnatural smallness of the strong CP violating phase. A massless up quark has long been proposed as one potential solution. A lattice calculation of the constants of the chiral Lagrangian essential for the determination of the up quark mass, 2 alpha_8 - alpha_5, is presented. We find 2 alpha_8 - alpha_5 = 0.29 +/- 0.18, which corresponds to m_u / m_d = 0.410 +/- 0.036. This is the first such calculation using a physical number of dynamical light quarks, N_f = 3.
dc.description4 pages, 5 figures, submitted to Phys. Rev. Lett., corrected small normalization error in f_pi (conclusions were unaffected), improved lattice spacing analysis, improved finite volume analysis
dc.identifierhttps://arxiv.org/abs/hep-lat/0112029
dc.identifierhttp://arxiv.org/abs/hep-lat/0112029
dc.identifierPhys.Rev.Lett.90:021601,2003
dc.identifierdoi:10.1103/PhysRevLett.90.021601
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/178782
dc.subjectHigh Energy Physics - Lattice
dc.subjectHigh Energy Physics - Phenomenology
dc.titleIs strong CP invariance due to a massless up quark?
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