The decay Bso→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 1.0fb -1 sample of data produced in 7TeV pp collisions at the LHC ; collected by the LHCb experiment. A modified Dalitz plot analysis of the final state is performed using both the invariant mass spectra ; the decay angular distributions. The π +π - system is shown to be dominantly in an S-wave state, ; the CP-odd fraction in this B̄s0 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/ψ of (19.79±0.47±0.52)%. © 2012 CERN. Published by the American Physical Society under the terms of the.

Analysis of the resonant components in B̄s0→J/ψπ +π -

PALANO, Antimo;PAPPAGALLO, MARCO IGNAZIO;
2012

Abstract

The decay Bso→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 1.0fb -1 sample of data produced in 7TeV pp collisions at the LHC ; collected by the LHCb experiment. A modified Dalitz plot analysis of the final state is performed using both the invariant mass spectra ; the decay angular distributions. The π +π - system is shown to be dominantly in an S-wave state, ; the CP-odd fraction in this B̄s0 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/ψ of (19.79±0.47±0.52)%. © 2012 CERN. Published by the American Physical Society under the terms of the.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11586/179799
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