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

W. J. Marciano; A. Sirlin

doi:10.1088/1674-1137/34/6/020

Chinese Physics C> 2010, Vol. 34> Issue(6) : 735-740 DOI: 10.1088/1674-1137/34/6/020

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

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Abstract：
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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W. J. Marciano and A. Sirlin. Muon g－2 discrepancy: new physics or a relatively light Higgs?[J]. Chinese Physics C, 2010, 34(6): 735-740. doi: 10.1088/1674-1137/34/6/020

W. J. Marciano and A. Sirlin. Muon g－2 discrepancy: new physics or a relatively light Higgs?[J]. Chinese Physics C, 2010, 34(6): 735-740. doi: 10.1088/1674-1137/34/6/020 shu

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Received: 2010-02-05
Revised: 1900-01-01

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

W. J. Marciano
A. Sirlin

Received Date: 2010-02-05
Accepted Date: 1900-01-01
Available Online: 2010-06-05

Abstract:

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.