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Analysis of the resonant components in Bs->J/\psi\pi+\pi-

Abstract : The decay Bs->J/\psi\pi+\pi- 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 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 \pi+\pi- system is shown to be dominantly in an S-wave state, and the CP-odd fraction in this Bs decay is shown to be greater than 0.977 at 95% confidence level. In addition, we report the first measurement of the J/\psi\pi+\pi- branching fraction relative to J/\psi\phi\ of (21.28 +/- 0.51 +/- 0.56)%.
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http://hal.in2p3.fr/in2p3-00693954
Contributor : Sabine Starita <>
Submitted on : Thursday, May 3, 2012 - 11:07:41 AM
Last modification on : Wednesday, September 16, 2020 - 4:26:11 PM

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R. Aaij, S. Barsuk, O. Callot, J. He, B. Jean-Marie, et al.. Analysis of the resonant components in Bs->J/\psi\pi+\pi-. Physical Review D, American Physical Society, 2012, 86, pp.052006. ⟨10.1103/PhysRevD.86.052006⟩. ⟨in2p3-00693954⟩

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