The UTfit Collaboration Report on the Unitarity Triangle beyond the Standard Model: Spring 2006

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Abstract
The status of the Unitarity Triangle beyond the Standard Model including the most recent results on Delta m_s, on dilepton asymmetries and on width differences obtained at the B factories and at the Tevatron is presented. We show that even allowing for general New Physics contributions the shape of the Unitarity Triangle must be very close to the Standard Model result, excluding any New Physics scenario in which the values of the CKM parameters largely deviate from their Standard Model values. With the new experimental measurements from the Tevatron, it is possible for the first time to obtain a significant constraint on New Physics in the B_s sector. We present the allowed ranges of New Physics contributions to Delta F=2 processes, and of the time-dependent CP asymmetry in B_s to J/Psi phi decays.

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