An Elusive Z' Coupled to Beauty
Abstract
By extending the standard gauge group to SU(3)c × SU(2)L × U(1)Y × U(1)X with X charges carried only by the third family we accommodate the LEP measurement of Rb and predict a potentially measurable discrepancy in AFBb in e+e- scattering and that D0D0 mixing may be near its experimental limit. The Z', which explicitly violates the GIM mechanism, can nevertheless be naturally consistent with FCNC constraints. Direct detection of the Z' is possible but challenging.
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