The recently measured B→τν branching ratio allows to test the Standard Model by probing virtual effects of new heavy particles, such as a charged Higgs boson. The accuracy of the test is currently ...limited by the experimental error on BR(B→τν) and by the uncertainty on the parameters fB and |Vub|. The redundancy of the Unitarity Triangle fit allows to reduce the error on these parameters and thus to perform a more precise test of the Standard Model. Using the current experimental inputs, we obtain BR(B→τν)SM=(0.84±0.11)×10−4, to be compared with BR(B→τν)exp=(1.73±0.34)×10−4. The Standard Model prediction can be modified by New Physics effects in the decay amplitude as well as in the Unitarity Triangle fit. We discuss how to disentangle the two possible contributions in the case of minimal flavour violation at large tanβ and generic loop-mediated New Physics. We also consider two specific models with minimal flavour violation: the Type-II Two Higgs Doublet Model and the Minimal Supersymmetric Standard Model.
A
bstract
We update the analysis of
D
meson mixing including the latest experimental results as of January 2014. We derive constraints on the parameters
M
12
, Γ
12
and Φ
12
that describe
D
meson ...mixing using all available data, allowing for CP violation. We also provide posterior distributions for observable parameters appearing in
D
physics.
A
bstract
We derive constraints on the parameters
M
12
, Γ
12
and Φ
12
that describe
D
meson mixing using all available data, allowing for CP violation. We also provide posterior distributions and ...predictions for observable parameters appearing in
D
physics.
We present the update of the Unitarity Triangle analysis in the Standard Model. Combining the direct measurements on sides and angles of the Unitarity Triangle, we determine the values of the CKM ...parameters and . This set of information provides a very poweful test of the Standard Model in the fermion sector. Thanks to the fact that the fit is overconstraint, we can predict hadronic QCD parameters without relying on any theoretical calculation of hadronic elements.
We combine all the available experimental information on Bs mixing, including the very recent tagged analyses of Bs → J/Ψϕ by the CDF and DØ collaborations. We find that the phase of the Bs mixing ...amplitude deviates more than 3σ from the Standard Model prediction. While no single measurement has a 3σ significance yet, all the constraints show a remarkable agreement with the combined result. This is a first evidence of physics beyond the Standard Model. This result disfavours New Physics models with Minimal Flavour Violation with the same significance.PACS Codes: 12.15.Ff, 12.15.Hh, 14.40.Nb
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