The D0 same-charge dimuon asymmetry and possibile new CP violation sources in the $B_s-{\bar{B}}_s$ system

Abstract

Recently, the D0 collaboration reported a large CP violation in the same-sign dimuon charge asymmetry which has the $3.2\sigma$ deviation from the value estimated in the Standard Model. In this paper, several new physics models are considered: the MSSM, two Higgs doublet model, the recent dodeca model, and a new $Z^{\prime }$ model. Generally, it is hard to achieve such a large CP violation consistently with other experimental constraints. We find that a scheme with extra non-anomalous U(1)${}^{\prime }$ gauge symmetry is barely consistent. In general, the extra $Z^{\prime }$ gauge boson induces the flavor changing neutral current interactions at tree level, which is the basic reason allowing a large new physics CP violation. To preserve the U(1)${}^{\prime }$ 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.

12 pages, 13 figures

References in corpus (12)

• Estimate of BR(B -> X_s gamma) at O(alpha_s^2)
• Less space for a new family of fermions
• Constraints on flavor-changing Z' models by B_s mixing, Z' production, and B_s -> μ^+ μ^-
• New Physics contributions to the lifetime difference in D0-anti-D0 mixing
• $B_s-{\bar{B}}_s$ Mixing constraints on FCNC and a non-universal $Z^{\prime }$
• Light Neutralinos with Large Scattering Cross Sections in the Minimal Supersymmetric Standard Model
• On theories of enhanced CP violation in B_s,d meson mixing
• CP Violating Contribution to Delta Gamma in the B_s System from Mixing with a Hidden Pseudoscalar
• The like-sign dimuon charge asymmetry in SUSY models
• Z-mediated charge and CP asymmetries and FCNCs in $B_{d,s}$ processes
• Addendum to: Implications of the measurements of B_s-B_s bar mixing on SUSY models
• SUSY R-parity violating contributions to the width differences for $D-\bar{D}$ and $B_{d,s}-{\bar{B}}_{d,s}$ systems

Cited by in corpus (4)

• On new physics in $\Delta {\Gamma }_d$
• Triangle Relation of Dark Matter, EDM and CP Violation in B0 Mixing in a Supersymmetric Q6 Model
• Imprints of CP violation asymmetries in rare ${\Lambda }_b\to \Lambda {\ell }^{+}{\ell }^{-}$ decay in family non-universal $Z^{\prime }$ model
• Associated Production of Different Flavor Heavy Quarks Through $W^{\prime }$ Bosons at the LHC