The topological susceptibility and f_pi from lattice QCD

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dc.creatorUKQCD Collaboration
dc.creatorHart, A.
dc.creatorTeper, M.
dc.date2000-04-18
dc.date2001-08-08
dc.date.accessioned2026-07-07T03:41:11Z
dc.date.available2026-07-07T03:41:11Z
dc.descriptionWe study the topological susceptibility, chi, in QCD with two quark flavours using the lattice field configurations recently produced by the UKQCD collaboration. We find clear evidence for the expected suppression at small quark mass, and examine the variation of chi with this mass. The resulting estimate of the pion decay constant, f_pi = 105 +/- 5 +18/-10 MeV, is consistent with the experimental value of approximately 93 MeV. We compare chi to the large-N_c prediction and find consistency over a large range of quark masses. The benefits of the non-perturbative action improvement scheme and the matched lattice spacings between simulation ensembles are discussed. We compare our results with other studies and suggest a reason why such a quark mass dependence has not been previously seen.
dc.description18 pp of LaTeX. No change to content between versions. Talk presented at the IoP Particle Physics 2000 conference in Edinburgh. Not for publication; superceded by our paper hep-lat/0108006
dc.identifierhttps://arxiv.org/abs/hep-ph/0004180
dc.identifierhttp://arxiv.org/abs/hep-ph/0004180
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/39527
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Lattice
dc.subjectHigh Energy Physics - Theory
dc.titleThe topological susceptibility and f_pi from lattice QCD
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