Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-10-28
Phys.Lett.B697:323-328,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
6 pages, 8 figures. Added another fit and some more discussion showing that BR(B->tau nu) comes out in good agreement with pre
Scientific paper
10.1016/j.physletb.2011.02.016
Using primarily experimental inputs for S(B -> psi Ks), Delta M_Bs, Delta M_Bd, BR(B -> tau nu) and epsilon_K along with necessary inputs from the lattice, we find that the measured value of sin(2 beta) is smaller than expectations of the Standard Model by as much as 3.3 sigma, and also that the measured value of the BR(B -> tau nu) seems to be less than the predicted value by about 2.8 sigma. However, through a critical study we show that most likely the dominant source of these deviations is in B_d(s) mixings and in sin(2 beta) and less so in B -> tau nu, and also that the bulk of the problem persists even if input from epsilon_K is not used. The fact that kaon mixing and epsilon_K are not the dominant source of the deviation from the Standard Model has the very important consequence that model independent considerations imply that the scale of the relevant new CP-violating physics is below O(2 TeV), thus suggesting that direct signals of the new particle(s) may well be accessible in collider experiments at the LHC and perhaps even at the Tevatron.
Lunghi Enrico
Soni Amarjit
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