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Standard Model updates and new physics analysis with the Unitarity Triangle fit

Abstract : We present the summer 2012 update of the Unitarity Triangle (UT) analysis performed by the UTfit Collaboration within the Standard Model (SM) and beyond. The increased accuracy on several of the fundamental constraints is now enhancing some of the tensions amongst and within the constraint themselves. In particular, the long standing tension between exclusive and inclusive determinations of the Vub and Vcb CKM matrix elements is now playing a major role. Then we present the generalisation the UT analysis to investigate new physics (NP) effects, updating the constraints on NP contributions to ΔF=2 processes. In the NP analysis, both CKM and NP parameters are fitted simultaneously to obtain the possible NP effects in any specific sector. Finally, based on the NP constraints, we derive upper bounds on the coefficients of the most general ΔF=2 effective Hamiltonian. These upper bounds can be translated into lower bounds on the scale of NP that contributes to these low-energy effective interactions.
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Submitted on : Friday, December 20, 2013 - 4:35:54 PM
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A. Bevan, M. Bona, M. Ciuchini, D. Derkach, E. Franco, et al.. Standard Model updates and new physics analysis with the Unitarity Triangle fit. Fourth Workshop on Theory, Phenomenology and Experiments in Heavy Flavour Physics, Jul 2012, Anacapri, Italy. pp.89-94, ⟨10.1016/j.nuclphysbps.2013.06.015⟩. ⟨in2p3-00921601⟩



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