2008/04/30 by M. Passera, W. J. Marciano, William J. Marciano +1 · 1 citation
Physics and Astronomy · #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph
paper · pdf · doi:10.1103/physrevd.78.013009
published as Phys.Rev.D78:013009,2008 · 8 pages, 3 figures. v2: minor changes, references added
arxiv created 2008/06/06 · openalex publication_date 2008/07/25 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
After a brief review of the muon g\ensuremath-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^\ensuremath- collisions could bridge the muon g\ensuremath-2 discrepancy, leading however to a decrease on the electroweak upper bound on MH, the SM Higgs boson mass. That bound is currently MH\ensuremath\lesssim150 GeV (95% C.L.) based on the preliminary top quark mass Mt=172.6(1.4) GeV and the recent determination \ensuremathΔ\ensuremathαhad(5)(MZ)=0.027 68(22), while the direct-search lower bound is MH>114.4 GeV (95% C.L.). By means of a detailed analysis we conclude that this solution of the muon g\ensuremath-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 MH 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.