4 research outputs found
First ADS analysis of B- -> D0K- decays in hadron collisions
Proceedings of DISCRETE 2010, Symposium on Prospects in the Physics of
Discrete Symmetries, Rome (IT), 6-11 December 2010Comment: 7 pages, 5 figure
The UTfit Collaboration Report on the Status of the Unitarity Triangle beyond the Standard Model I. Model-independent Analysis and Minimal Flavour Violation
Starting from a (new physics independent) tree level determination of rhobar
and etabar, we perform the Unitarity Triangle analysis in general extensions of
the Standard Model with arbitrary new physics contributions to loop-mediated
processes. Using a simple parameterization, we determine the allowed ranges of
non-standard contributions to |Delta F|=2 processes. Remarkably, the recent
measurements from B factories allow us to determine with good precision the
shape of the Unitarity Triangle even in the presence of new physics, and to
derive stringent constraints on non-standard contributions to |Delta F|=2
processes. Since the present experimental constraints favour models with
Minimal Flavour Violation, we present the determination of the Universal
Unitarity Triangle that can be defined in this class of extensions of the
Standard Model. Finally, we perform a combined fit of the Unitarity Triangle
and of new physics contributions in Minimal Flavour Violation, reaching a
sensitivity to a new physics scale of about 5 TeV. We also extrapolate all
these analyses into a "year 2010" scenario for experimental and theoretical
inputs in the flavour sector. All the results presented in this paper are also
available at the URL http://www.utfit.org, where they are continuously updated.Comment: 29 pages, 56 figure
First evidence of new physics in b â s transitions
We combine all the available experimental information on Bs mixing, including the very
recent tagged analyses of Bs â J/ÎšÏ by the CDF and DĂ collaborations. We find that the
phase of the Bs mixing amplitude deviates more than 3Ï from the Standard Model
prediction. While no single measurement has a 3Ï 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