Update of the Unitarity Triangle Analysis

Abstract

We present the status of the Unitarity Triangle Analysis (UTA), within the Standard Model (SM) and beyond, with experimental and theoretical inputs updated for the ICHEP 2010 conference . Within the SM, we find that the general consistency among all the constraints leaves space only to some tension (between the UTA prediction and the experimental measurement) in BR(B → τν), sin 2β and ε K . In the UTA beyond the SM, we allow for New Physics (NP) effects in ∆F = 2 processes. The hint of NP at the 2.9σ level in the B s -Bs mixing turns out to be confirmed by the present update, which includes the new D0 result on the dimuon charge asymmetry but not the new CDF measurement of φ s , being the likelihood not yet released.

U(2) and Minimal Flavour Violation in Supersymmetry

“…While S ψK S coincides with the experimental measurement (note that it was among the fit constraints), S ψφ is clearly preferred to be larger than its tiny SM value, indicated by a horizontal line. The pattern implied by (11)(12)(13)(14) was already noticed in [24] assuming the dominance of the LL operators. The correlation between S ψK S and S ψφ implied by eq.s ( 12) and ( 15) is the same pointed out in [25] in the context of effective theory approaches with a horizontal SU (2) symmetry acting on left-handed light quarks.…”

“…While the CKM picture has been very successful in describing experimental observations of flavour and CP violation, recently there are mounting tensions in this description. Firstly, there is a tension among the CP violating parameter in the K system | K |, the ratio of mass differences in the B d,s systems ∆M d /∆M s and the mixing induced CP asymmetry in B d → ψK S , which in the SM measures sin(2β) [7][8][9][10][11]. Secondly, there are hints for a sizable mixing-induced CP asymmetry in B s → J/ψφ, implying non-standard CP violation in the B s system, and an anomalous dimuon charge asymmetry, pointing to non-standard CP violation either in the B d or B s systems [12,13].…”

Footprints of SUSY GUTs in flavour physics

“…Despite of the remarkable agreement of flavour data with the SM predictions in the K and B d systems, a Observable SSU (5)RN model closer look at the data might indicate some tensions especially in CP violating observables. In particular, the most recent UT analyses show some tensions at the level of (2 − 3)σ [8][9][10][11] and recent messages from the Tevatron seem to hint the presence of new sources of CPV entering the B 0 s systems [12][13][14]. Motivated by the above facts, in the present work, we have analyzed the low energy implications of a supersymmetric SU (5) GUT scenario with right-handed neutrinos [17] (SSU (5) RN ) accounting for the neutrino masses and mixing angles by means of a type-I see-saw mechanism [3].…”

“…Despite of the remarkable agreement of flavour data with the SM predictions in the K and B d systems, a closer look at the data might indicate some tensions especially in CP violating observables. In particular: i) the most recent UT analyses [8][9][10][11] show that the size of CP violation determined through the B 0 d − B 0 d system, appears insufficient to describe the experimental value of K within the SM if the ∆M d /∆M s constraint is taken into account [9]. Vice versa, the simultaneous SM description of K and ∆M d /∆M s requires a sin 2β significantly larger than the measured value of S ψK S [8].…”

Flavour physics from an approximate U(2)3 symmetry

“…in a fit with c K LL = 0. The preference for non-SM values of the parameters in both cases arises from the tension in the SM CKM fit between K (when using the experimental data for V cb and sin 2β as inputs) and S ψK S = sin 2β [11][12][13][14][15][16]. As is well known, this tension can be solved either by increasing K (as in the first case) or by decreasing S ψK S by means of a new physics contribution to the B d mixing phase (as in the second case).…”