Abstract
In this paper, we calculate the rare top quark decay t → ch in a supersymmetric extension of the Standard Model where baryon and lepton numbers are local gauge symmetries. Adopting reasonable assumptions on the parameter space, we find that the branching ratios of t→ch can reach 10−3, which could be detected in the near future.
Highlights
Top quark plays a special role in the standard model(SM) and holds great promise in revealing the secret of new physics beyond the SM
The flavor-changing neutral current (FCNC) decays t → ch deserve special attention, since the branching ratios(BRs) of those rare processes are strongly suppressed in the SM
The running LHC is a top-quark factory, and provides a great opportunity to seek out top-quark decays
Summary
Top quark plays a special role in the standard model(SM) and holds great promise in revealing the secret of new physics beyond the SM. The running LHC is a top-quark factory, and provides a great opportunity to seek out top-quark rare decays Among those rare processes, the flavor-changing neutral current (FCNC) decays t → ch deserve special attention, since the branching ratios(BRs) of those rare processes are strongly suppressed in the SM. ATLAS and CMS have reported significant excess events which are interpreted probably to be related to the neutral Higgs with mass mh0 ∼ 124−126 GeV[1, 2] This implies that the Higgs mechanism to break electroweak symmetry possibly has a solid experimental cornerstone. Since there are some exotic fields, and exist couplings between exotic quark fields and SM quarks in the superpotential, so it will cause flavor changing processes, and the BRs for FCNC top decays can be orders of magnitude larger.
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