Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-03-25
Mod.Phys.Lett.A25:1099-1106,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages, 2 figures. Effects of complex new physics couplings added, the text modified to emphasize certain aspects
Scientific paper
10.1142/S021773231003238X
New physics in the form of scalar/pseudoscalar operators cannot lower the semileptonic branching ratio B(B --> K mu+ mu-) below its standard model value. In addition, we show that the upper bound on the leptonic branching ratio B(B_s --> mu+ mu-) sets a strong constraint on the maximum value of B(B --> K mu+ mu-) in models with multiple Higgs doublets: with the current bound, B(B --> K mu+ mu-) cannot exceed the standard model prediction by more than 2.5%. The conclusions hold true even if the new physics couplings are complex. However these constraints can be used to restrict new physics couplings only if the theoretical and experimental errors in B(B --> K mu+ mu-) are reduced to a few per cent. The constraints become relaxed in a general class of models with scalar/pesudoscalar operators.
Alok Ashutosh Kumar
Dighe Amol
Sankar Uma S.
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