• Open Access

Measurement of resonant and CP components in B¯s0J/ψπ+π decays

R. Aaij et al. (LHCb Collaboration)
Phys. Rev. D 89, 092006 – Published 14 May 2014

Abstract

Structure of the decay B¯s0J/ψπ+π is studied using data corresponding to 3fb1 of integrated luminosity from pp collisions produced by the LHC and collected by the LHCb detector. Five interfering π+π states are required to describe the decay: f0(980),f0(1500),f0(1790),f2(1270), and f2(1525). An alternative model including these states and a nonresonant J/ψπ+π component also provides a good description of the data. Based on the different transversity components measured for the spin-2 intermediate states, the final state is found to be compatible with being entirely CP odd. The CP-even part is found to be <2.3% at a 95% confidence level. The f0(500) state is not observed, allowing a limit to be set on the absolute value of the mixing angle with the f0(980) of <7.7° at a 90% confidence level, consistent with a tetraquark interpretation of the f0(980) substructure.

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  • Received 25 February 2014

DOI:https://doi.org/10.1103/PhysRevD.89.092006

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.

© 2014 CERN, for the LHCb Collaboration

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Vol. 89, Iss. 9 — 1 May 2014

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