Anatomy of prominent B and K decays and signatures of CP violating new physics in the electroweak penguin sector

By Andrzej Buras, R. Fleischer, S. Recksiegel, F. Schwab. 2004

207 citations recorded by the source corpus.

The recent observation of Bd → � 0 � 0 at the B factories with a surprisingly large branching ratio represents a challenge for theory, and complements the amazingly small Bd → � + � − rate. We point out that all puzzling B → �� features can be accommodated in the Standard Model (SM) through non-factorizable hadronic interference effects, extract the relevant parameters, and predict the CP asymmetries of Bd → � 0 � 0 . Using thenSU(3) flavour-symmetry and plausible dynamical assumptions, we fix the hadronicB → �K parameters through theirB → �� counterparts, and determine the CKM angle , with a result in remarkable accordance with the usual fits for the unitarity triangle. We may then analyse the B → �K system in the SM, where we find agreement with the experimental picture, with the exception of those observables that are significantly affected by electroweak (EW) penguins, thereby suggesting new physics (NP) in this sector. Indeed, a moderate enhancement of these topologies and a large CP-violating NP phase allow us to describe any currently observed feature of the B → �K modes, and to predict the CP-violating Bd → � 0 KS observables. If we then restrict ourselves to a specific scenario where NP enters only through Z 0 penguins, we obtain a link to rare K and B decays, where the most spectacular NP effects are an enhancement of the KL → � 0 �¯ rate by one order of magnitude with BR(KL → � 0 �¯

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/c3527e04daf3ef5f6268c9d022c9de60113e49fc

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In Nuclear and High Energy Physics

1. Andrzej Buras
2. Stefania Gori
3. Bjoern Duling
4. M. Blanke
5. K. Gemmler
6. S. Recksiegel
7. T. Feldmann
8. B. Duling

Citations in the corpus

• Rare K and B Decays in a warped extra dimension with custodial protection (2008, methodology): “In the model in question following [42] we have (λ = 0.”
• Patterns of flavour violation in the presence of a fourth generation of quarks and leptons (2010, methodology): “Adapting the formulae in [112–115] with the help of [100] to the SM4, we find”