2006/07/31 by Jae-hyeon Park · 3 citations
Computer Science · Physics and Astronomy · #Boson #Branching fraction #Computational Physics and Python Applications #Degenerate energy levels #Higgs boson #Lepton #Neutrino Physics Research #Particle physics theoretical and experimental studies #Sigma #Standard Model (mathematical formulation) #Two-Higgs-doublet model #Universality (dynamical systems) #hep-ex #hep-ph
paper · pdf · doi:10.1088/1126-6708/2006/10/077
published as JHEP0610:077,2006 · 16 pages, published version with minor changes
openalex publication_date 2006/10/27 · arxiv created 2006/11/13 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
A recent analysis of the LEP data shows an interesting deviation from lepton universality in W boson decays. An excess at the level of 2.8 sigma is found in the tau mode branching ratio with respect to the other two modes. It is suggested that this seeming lepton non-universality might stem from pair production of charged Higgs bosons almost degenerate with W, that preferentially decay to heavy fermions. It is shown that the deviation can be reduced to 1.4 sigma in two Higgs doublet model I without any conflict with the existing direct or indirect constraints. This conclusion is largely independent of tan beta, the ratio of Higgs vacuum expectation values. This scenario can be tested at the forthcoming international linear collider.