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First evidence of new physics in b ↔ s transitions

Marcella Bona1 email, Marco Ciuchini2 email, Enrico Franco3 email, Vittorio Lubicz4,2 email, Guido Martinelli5,3 email, Fabrizio Parodi6 email, Maurizio Pierini1 email, Carlo Schiavi6 email, Luca Silvestrini3 email, Viola Sordini7 email, Achille Stocchi8 email and Vincenzo Vagnoni9 email

1  CERN, CH-1211 Geneva 23, Switzerland

2  INFN, Sezione di Roma Tre, I-00146 Roma, Italy

3  INFN, Sezione di Roma, I-00185 Roma, Italy

4  Dipartimento di Fisica, Università di Roma Tre, I-00146 Roma, Italy

5  Dipartimento di Fisica, Università di Roma "La Sapienza", I-00185 Roma, Italy

6  Dipartimento di Fisica, Università di Genova and INFN, I-16146 Genova, Italy

7  ETH Zurich, HG Raemistrasse 101, 8092 Zurich, Switzerland

8  Laboratoire de l'Accélérateur Linéaire, IN2P3-CNRS et Université de Paris-Sud, BP 34, F-91898 Orsay Cedex, France

9  INFN, Sezione di Bologna, I-40126 Bologna, Italy

author email corresponding author email

PMC Physics A 2009, 3:6doi:10.1186/1754-0410-3-6

Published: 18  December  2009

Abstract

We combine all the available experimental information on Bs mixing, including the very recent tagged analyses of Bs → J/Ψϕ by the CDF and DØ collaborations. We find that the phase of the Bs mixing amplitude deviates more than 3σ from the Standard Model prediction. While no single measurement has a 3σ significance yet, all the constraints show a remarkable agreement with the combined result. This is a first evidence of physics beyond the Standard Model. This result disfavours New Physics models with Minimal Flavour Violation with the same significance.

PACS Codes: 12.15.Ff, 12.15.Hh, 14.40.Nb

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