Implication of possible observation of enhanced Bd0 --> mu+ mu- decay
Abstract
The very rare Bd0 --> mu+ mu- decay may be the last chance for New Physics in flavor sector at the LHC, before the 13 TeV run in 2015. Partially motivated by the known tension in sin(2beta/phi1), enhancement beyond (3-4) x 10-10 would likely imply the effect of a fourth generation of quarks. If observed at this level, the 126 GeV boson may not be the actual Higgs boson, while the b --> d quadrangle (modulo mt') would jump out. The 2011-2012 data is likely not sensitive to values below 3 x 10-10, and the mode should continue to be pursued with the 13 TeV run.
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