  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/phi_1), 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 m_t') 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.
