Abstract
The decay B¯s0→J/ψπ+π− can be exploited to study CP violation. A detailed understanding of its structure is imperative in order to optimize its usefulness. An analysis of this three-body final state is performed using a 1.0 fb−1 sample of data produced in 7 TeV pp collisions at the LHC and collected by the LHCb experiment. A modified Dalitz plot analysis of the final state is performed using both the invariant mass spectra and the decay angular distributions. The π+π− system is shown to be dominantly in an S-wave state, and the CP-odd fraction in this B¯s0 decay is shown to be greater than 0.977 at 95% confidence level. In addition, we report the first measurement of the J/ψπ+π− branching fraction relative to J/ψϕ of (19.79±0.47±0.52)%.11 MoreReceived 25 April 2012DOI:https://doi.org/10.1103/PhysRevD.86.052006This 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
Highlights
Measurement of mixing-induced CP violation in B"0s decays is of prime importance in probing physics beyond the Standard Model
Final states that are CP eigenstates with large rates and high detection efficiencies are very useful for such studies
We report on the resonant structure and the CP content of the final state
Summary
Measurement of mixing-induced CP violation in B"0s decays is of prime importance in probing physics beyond the Standard Model. Final states that are CP eigenstates with large rates and high detection efficiencies are very useful for such studies. ÞÀ decay, the final state has four charged tracks and has high detection efficiency. To fully exploit the J=c þÀ final state for measuring CP violation, it is important to determine its resonant and CP content. In this paper the J=c þ and þÀ mass spectra and decay angular distributions are used to study the resonant and nonresonant structures. This differs from a classical ‘‘Dalitz plot’’ analysis [6] because one of the particles in the final state, the J=c , has spin-1 and its three decay amplitudes must be considered.
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