Hints of large tanβ in flavour physics

Motivated by the first evidence of the Bu→τν transition reported by Belle [Belle Collaboration, K. Ikado, et al., hep-ex/0604018] and by the precise ΔMBs measurement by CDF [CDF Collaboration, G. Gomez-Ceballos, Talk presented at FPCP 2006, Vancouver, Canada, 9-12 April 2006, http://fpcp2006.triumf.ca/; D∅ Collaboration, V. Abazov, hep-ex/0603029], we analyse these and other low-energy observables in the framework of the MSSM at large tanβ. We show that for heavy squarks and A terms (Mq˜, AU≳1 TeV) such scenario has several interesting virtues. It naturally describes: (i) a suppression of B(Bu→τν) of (10-40)%, (ii) a sizable enhancement of (g−2)μ, (iii) a heavy SM-like Higgs (mh0∼120 GeV), (iv) small non-standard effects in ΔMBs and B(B→Xsγ) (in agreement with present observations). The possibilities to find more convincing evidences of such scenario, with improved data on B(Bu→τν), B(Bs,d→ℓ+ℓ−) and other low-energy observables, are briefly discussed.