Electromagnetic contributions to pseudoscalar masses

Basak, S. et al. (2012) Electromagnetic contributions to pseudoscalar masses. In: 7th International Workshop on Chiral Dynamics, Jefferson Lab, Newport News, Virginia, USA, 6-10 August 2012, (doi: 10.22323/1.172.0030)

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We report on the calculation by the MILC Collaboration of the electromagnetic effects on kaon and pion masses. These masses are computed in QCD with dynamical (asqtad staggered) quarks plus quenched photons at three lattice spacings varying from 0.12 to 0.06 fm. The masses are fit to staggered chiral perturbation theory with NLO electromagnetic terms, as well as analytic terms at higher order. We extrapolate the results to physical light-quark masses and to the continuum limit. At the current stage of the analysis, most, but not all, of the systematic errors have been estimated. The main goal is the comparison of kaon electromagnetic splittings to those of the pion, i.e., an evaluation of the corrections to “Dashen’s theorem.” This in turn will allow us to significantly reduce the systematic errors in our determination of m<sub>u</sub>/m<sub>d</sub>.

Item Type:Conference Proceedings
Glasgow Author(s) Enlighten ID:Laiho, Dr John and DeTar, Professor Carleton
Authors: Basak, S., Bazavov, A., Bernard, C., DeTar, C., Freeland, E., Freeman, W., Foley, J., Gottlieb, S., Heller, U.M., Hetrick, J.E., Laiho, J., Levkova, L., Oktay, M., Osborn, J., Sugar, R.L., Torok, A., Toussaint, D., Van de Water, R.S., and Zhou, R.
College/School:College of Science and Engineering > School of Physics and Astronomy
Copyright Holders:Copyright © 2012 The Authors
Publisher Policy:Reproduced under a Creative Commons License
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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
481951Investigations in Quantum Chromodynamics and Physics Beyond the Standard ModelChristine DaviesScience & Technologies Facilities Council (STFC)ST/G00059X/1P&A - PHYSICS & ASTRONOMY
573721Phenomenology from Lattice QCD and Collider PhysicsChristine DaviesScience & Technologies Facilities Council (STFC)ST/J000442/1P&A - PHYSICS & ASTRONOMY