The muon g-2 and the bounds on the Higgs boson mass

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dc.creatorPassera, M.
dc.creatorMarciano, W. J.
dc.creatorSirlin, A.
dc.date2008-04-08
dc.date2008-06-06
dc.date.accessioned2026-07-07T11:49:40Z
dc.date.available2026-07-07T11:49:40Z
dc.descriptionAfter a brief review of the muon g-2 status, we analyze the possibility that the present discrepancy between experiment and the Standard Model (SM) prediction may be due to hypothetical errors in the determination of the hadronic leading-order contribution to the latter. In particular, we show how an increase of the hadro-production cross section in low-energy e^+e^- collisions could bridge the muon g-2 discrepancy, leading however to a decrease on the electroweak upper bound on M_H, the SM Higgs boson mass. That bound is currently M_H < ~ 150GeV (95%CL) based on the preliminary top quark mass M_t = 172.6(1.4)GeV and the recent determination Δα_{\rm had}^{(5)}(M_Z) = 0.02768(22), while the direct-search lower bound is M_H > 114.4GeV (95%CL). By means of a detailed analysis we conclude that this solution of the muon g-2 discrepancy is unlikely in view of current experimental error estimates. However, if this turns out to be the solution, the 95%CL upper bound on M_H is reduced to about 130GeV which, in conjunction with the experimental lower bound, leaves a narrow window for the mass of this fundamental particle.
dc.description8 pages, 3 figures. v2: minor changes, references added
dc.identifierhttps://arxiv.org/abs/0804.1142
dc.identifierhttp://arxiv.org/abs/0804.1142
dc.identifierPhys.Rev.D78:013009,2008
dc.identifierdoi:10.1103/PhysRevD.78.013009
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/203317
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Experiment
dc.titleThe muon g-2 and the bounds on the Higgs boson mass
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