Muon g-2 discrepancy:new physics or a relatively light Higgs?

中国物理C, 2010, 34(6): 735-740.

^1, , ^2, , ^3,

1.Istituto Nazionale Fisica Nucleare,Sezione di Padova,I-35131,Padova,Italy

2.Brookhaven National Laboratory,Upton,New York 11973,USA

3.Department of Physics,New York University,10003 New York NY,USA

基金项目: U.S.DOE (DE-AC02-76CH00016;MRTN-CT 2006-035505;PHY-0758032)

Muon g-2 discrepancy:new physics or a relatively light Higgs?

M.Passera ^1, , W.J.Marciano ^2, , A.Sirlin ^3,

1.Istituto Nazionale Fisica Nucleare,Sezione di Padova,I-35131,Padova,Italy

2.Brookhaven National Laboratory,Upton,New York 11973,USA

3.Department of Physics,New York University,10003 New York NY,USA

Keywords： muon anomalous magnetic moment

After a brief review of the muon g-2 status,we discuss hypothetical errors in the Standard Model prediction that might explain the present discrepancy with the experimental value.None of them seems likely.In particular,a hypothetical increase of the hadroproduction cross section in low-energy e+e-collisions could bridge the muon g-2 discrepancy,but it is shown to be unlikely in view of current experimental error estimates.If,nonetheless,this turns out to be the explanation of the discrepancy,then the 95% CL upper bound on the Higgs boson mass is reduced to about 135 GeV which,in conjunction with the experimental 114.4 GeV 95%CL lower bound,leaves a narrow window for the mass of this fundamental particle.

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Muon g-2 discrepancy:new physics or a relatively light Higgs?

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