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arXiv · 1010.5123

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

Jihn E. Kim·Min-Seok Seo·Seodong Shin
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Abstract

Recently, the D0 collaboration reported a large CP violation in the same-sign dimuon charge asymmetry which has the $3.2 σ$ 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 $Z'$ 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)$'$ gauge symmetry is barely consistent. In general, the extra $Z'$ 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)$'$ 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.

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Jihn E. Kim, Min-Seok Seo, Seodong Shin. 2011-02-15. The D0 same-charge dimuon asymmetry and possibile new CP violation sources in the $B_s-\bar{B}_s$ system. https://doi.org/10.1103/physrevd.83.036003

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