The decay anti-B0s → J/ψ π+ 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 anti-B0s decay is shown to be greater than 0.977 at 95% confidence level. In addition, we report the first measurement of the J/ψ π+ π− branching fraction relative to J/ψ ϕ of (19.79 ± 0.47 ± 0.52)%.

R. Aaij, C. Abellan Beteta, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, et al. (2012). Analysis of the Resonant Components in anti-B0s → J/ψ π+ π−. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 86(5), 1-20 [10.1103/PhysRevD.86.052006].

Analysis of the Resonant Components in anti-B0s → J/ψ π+ π−

CARBONE, ANGELO;GALLI, DOMENICO;PATRIGNANI, CLAUDIA;PERAZZINI, STEFANO;VAGNONI, VINCENZO MARIA;ZANGOLI, MARIA;
2012

Abstract

The decay anti-B0s → J/ψ π+ 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 anti-B0s decay is shown to be greater than 0.977 at 95% confidence level. In addition, we report the first measurement of the J/ψ π+ π− branching fraction relative to J/ψ ϕ of (19.79 ± 0.47 ± 0.52)%.
2012
R. Aaij, C. Abellan Beteta, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, et al. (2012). Analysis of the Resonant Components in anti-B0s → J/ψ π+ π−. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 86(5), 1-20 [10.1103/PhysRevD.86.052006].
R. Aaij; C. Abellan Beteta; B. Adeva; M. Adinolfi; C. Adrover; A. Affolder; Z. Ajaltouni; J. Albrecht; F. Alessio; M. Alexander; S. Ali; G. Alkhazov; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/126924
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