2010/10/31 by Jihn E. Kim, Min-Seok Seo, Min‐Seok Seo +1 · 4 citations
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.83.036003
published as Phys.Rev.D83:036003,2011 · 12 pages, 13 figures
openalex publication_date 2011/02/11 · arxiv created 2011/02/15 · arxiv updated 2011/02/18 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Recently, the D0 Collaboration reported a large CP violation in the same-sign dimuon charge asymmetry which has the 3.2\ensuremathσ deviation from the value estimated in the standard model. In this paper, several new physics models are considered: the minimal supersymmetric standard model, the two Higgs doublet model, the recent dodeca model, and a new Z^\ensuremath' model. Generally, it is hard to achieve such a large CP violation consistently with other experimental constraints. We find that a scheme with extra nonanomalous U(1)^\ensuremath' gauge symmetry is barely consistent. In general, the extra Z^\ensuremath' gauge boson induces the flavor changing neutral current interactions at tree level, which is the basic reason for allowing a large new physics CP violation. To preserve the U(1)^\ensuremath' symmetry at high energy, SU(2)L singlet exotic heavy quarks of mass above 1 TeV and the standard model gauge singlet scalars are introduced.