• Open Access

Determination of the Sign of the Decay Width Difference in the Bs0 System

R. Aaij et al. (LHCb Collaboration)
Phys. Rev. Lett. 108, 241801 – Published 11 June 2012

Abstract

The interference between the K+K S-wave and P-wave amplitudes in Bs0J/ψK+K decays with the K+K pairs in the region around the ϕ(1020) resonance is used to determine the variation of the difference of the strong phase between these amplitudes as a function of K+K invariant mass. Combined with the results from our CP asymmetry measurement in Bs0J/ψϕ decays, we conclude that the Bs0 mass eigenstate that is almost CP=+1 is lighter and decays faster than the mass eigenstate that is almost CP=1. This determines the sign of the decay width difference ΔΓsΓLΓH to be positive. Our result also resolves the ambiguity in the past measurements of the CP violating phase ϕs to be close to zero rather than π. These conclusions are in agreement with the standard model expectations.

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  • Received 22 February 2012

DOI:https://doi.org/10.1103/PhysRevLett.108.241801

This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

© 2012 CERN, for the LHCb Collaboration

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Vol. 108, Iss. 24 — 15 June 2012

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