Svjetlana Fajfer, Jernej F. Kamenik, Ivan Nisandzic, Jure Zupan
Present measurements of b->c tau nu and b->u tau nu transitions differ from the standard model predictions of lepton flavor universality by combined 4.6sigma, if gaussian errors are assumed. We examine new physics interpretations of this anomaly. An effective field theory analysis shows that minimal flavor violating models are disfavored as an explanation. Allowing for general flavor violation, right-right vector and right-left scalar quark currents are identified as viable candidates. We discuss explicit examples of two Higgs doublet models, leptoquarks as well as quark and lepton compositeness. Finally, implications for LHC searches and future measurements at the (super)B-factories are presented.
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http://arxiv.org/abs/1206.1872
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