Journal
PHYSICS LETTERS B
Volume 674, Issue 4-5, Pages 286-290Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2009.03.055
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Funding
- STFC [ST/G00062X/1, ST/G00059X/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/G00059X/1, ST/G00062X/1] Funding Source: researchfish
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We compare flavour singlet and non-singlet vector mesons from first principles using lattice QCD. With N-f = 2 flavours of light quark, this addresses the omega-rho mass difference. Using maximally twisted-mass lattice QCD, we are able for the first time to determine this mass difference precisely and we compare with experiment. We also discuss omega-rho mixing effects arising within QCD through the u-d quark mass difference. (C) 2009 Elsevier B.V. All rights reserved.
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