The muon g-2 and the bounds on the Higgs boson mass
- Istituto Nazionale Fisica Nucleare, Sezione di Padova, I-35131, Padova (Italy)
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{sup +}e{sup -} collisions could bridge the muon g-2 discrepancy, leading however to a decrease on the electroweak upper bound on M{sub H}, the SM Higgs boson mass. That bound is currently M{sub H} < or approx. 150 GeV (95% C.L.) based on the preliminary top quark mass M{sub t}=172.6(1.4) GeV and the recent determination {delta}{alpha}{sub had}{sup (5)}(M{sub Z})=0.027 68(22), while the direct-search lower bound is M{sub 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{sub 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.
- OSTI ID:
- 21250205
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 78, Issue 1; Other Information: DOI: 10.1103/PhysRevD.78.013009; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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