A fourth generation, anomalous like-sign dimuon charge asymmetry and the LHC

Abstract

A fourth chiral generation, with $m_{t^{\prime }}$ in the range $\sim (300-500)$ GeV and a moderate value of the CP-violating phase can explain the anomalous like-sign dimuon charge asymmetry observed recently by the D0 collaboration. The required parameters are found to be consistent with constraints from other $B$ and $K$ decays. The presence of such quarks, apart from being detectable in the early stages of the LHC, would also have important consequences in the electroweak symmetry breaking sector.

arXiv comment18 pages, 9 figures, Figure 1 is modified, more discussions are added in section 2. new references added

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