Universal unitarity triangle and physics beyond the standard model

By Andrzej Buras, Paolo Gambino, M. Gorbahn, S. Jäger, L. Silvestrini. 2000

506 citations recorded by the source corpus.

We make the simple observation that there exists a universal unitarity triangle for all models, like the SM, the Two Higgs Doublet Models I and II and the MSSM with minimal flavour violation, that do not have any new operators beyond those present in the SM and in which all flavour changing transitions are governed by the CKM matrix with no new phases beyond the CKM phase. This universal triangle can be determined in the near future from the ratio (DeltaM)(d)/(DeltaM)(s) and sin 2 beta measured first through the CP asymmetry in B-d(0) --> psi K-S and later in K --> pi nu )over bar> decays. Also suitable ratios of the branching ratios for B --> X(d,s)nu )over bar> and B-d,B-s --> mu (+)mu (-) and the angle gamma measured by means of CP asymmetries in B decays can be used for this determination. Comparison of this universal triangle with the nonuniversal triangles extracted in each model using epsilon, (DeltaM)(d) and various branching ratios for rare decays will allow to find out in a transparent manner which of these models, if any, is singled out by experiment. A virtue of the universal triangle is that it allows to separate the determination of the CKM parameters from the determination of new parameters present in the extensions of the SM considered here.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/92ccf44786f638ca4c533dcf02b4ac1fc1496a5b

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Citations in the corpus

Higgs-mediated FCNCs: natural flavour conservation vs. minimal flavour violation (2010, background): “The so-called Constrained MFV, originally proposed in [ 4 ], is based on the following two assumptions: 1) no new eective FCNC dimension-six operators beyond those already present in the SM; 2) the avour and CPV structure of these operators is dictated by the CKM factors V 3i V3j (for di! dj FCNC tr”
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The anatomy of quark flavour observables in 331 models in the flavour precision era (2012, background): “le in this approach. Our strategy is explained in concrete terms in Section 8. One of the important questions in this context is whether the frameworks of constrained Minimal Flavour Violation (CMFV) [15] and the more general framework of MFV [16] will be capable of describing the future data. In mo”
Anatomy and phenomenology of FCNC and CPV effects in SUSY theories (2009, background): “Consequently, the corresponding UT, the universal unitarity triangle (UUT) [3] of models with constrained minimal flavour violation (CMFV) [4, 80], could differ from the RUT signaling NP effects beyond not only the SM but also beyond CMFV models.”
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