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Journal of High Energy Physics 0603 (2006) 080
The UTfit Collaboration Report on the Status of the Unitarity Triangle beyond the Standard Model I. Model-independent Analysis and Minimal Flavour Violation
M. Bona1, M. Ciuchini2, E. Franco3, V. Lubicz2, G. Martinelli3, F. Parodi4, M. Pierini, P. Roudeau5, C. Schiavi4, L. Silvestrini3, A. Stocchi5, V. Vagnoni6
UTfit Collaboration(s)
(2006)

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.
1 :  INFN, Sezione di Torino - Istituto Nazionale di Fisica Nucleare, Sezione di Torino
2 :  INFN, Sezione di Roma 3 - Istituto Nazionale di Fisica Nucleare, Sezione di Roma 3
3 :  INFN - Istituto Nazionale di Fisica Nucleare [Sezione di Roma 1]
4 :  INFN, Sezione di Genova - Istituto Nazionale di Fisica Nucleare, Sezione di Genova
5 :  LAL - Laboratoire de l'Accélérateur Linéaire
6 :  INFN, Sezione di Bologna - Istituto Nazionale di Fisica Nucleare, Sezione di Bologna
Physique/Physique des Hautes Energies - Phénoménologie
CP violation – Beyond Standard Model – B-Physics – Kaon Physics
Lien vers le texte intégral : 
http://fr.arXiv.org/abs/hep-ph/0509219