Journal
PHYSICAL REVIEW D
Volume 78, Issue 1, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.78.013009
Keywords
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Funding
- E. C. Research Training Networks [MRTN-CT-2004-503369, MRTN-CT-2006035505]
- U.S. DOE [DE-AC02-76CH00016]
- U.S. NSF [PHY-0245068]
- Direct For Mathematical & Physical Scien
- Division Of Physics [0758032] Funding Source: National Science Foundation
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After 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 hadroproduction 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 less than or similar to 150 GeV (95% C.L.) based on the preliminary top quark mass M-t = 172.6(1.4) GeV and the recent determination Delta alpha((5))(had)(M-Z) = 0.027 68(22), while the direct-search lower bound is M-H > 114.4 GeV (95% C.L.). 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% C.L. upper bound on M-H is reduced to about 130 GeV which, in conjunction with the experimental lower bound, leaves a narrow window for the mass of this fundamental particle.
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