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First evidence of new physics in b ↔ s transitions

Marcella Bona1, Marco Ciuchini2, Enrico Franco3, Vittorio Lubicz42, Guido Martinelli35, Fabrizio Parodi6, Maurizio Pierini1, Carlo Schiavi6, Luca Silvestrini3*, Viola Sordini7, Achille Stocchi8 and Vincenzo Vagnoni9

Author Affiliations

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


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PMC Physics A 2009, 3:6 doi: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