The first observation of the B̄0→J/ψK +K- decay is presented with a data sample corresponding to an integrated luminosity of 1.0 fb-1 of pp collisions at a center-of-mass energy of 7 TeV collected with the LHCb detector. The branching fraction is measured to be B(B̄0→J/ψK+K -)=(2.53±0.31±0.19)×10-6, where the first uncertainty is statistical and the second is systematic. An amplitude analysis of the final state in the B̄0→J/ψK +K- decay is performed to separate resonant and nonresonant contributions in the K+K- spectrum. Evidence of the a0(980) resonance is reported with statistical significance of 3.9 standard deviations. The corresponding product branching fraction is measured to be B(B̄0→J/ψa0(980),a 0(980)→K+K-)=(4.70±3.31±0. 72)×10-7, yielding an upper limit of B(B ̄0→J/ψa0(980),a0(980)→K +K-)<9.0×10-7 at 90% confidence level. No evidence of the resonant decay B̄0→J/ψφ is found, and an upper limit on its branching fraction is set to be B(B ̄0→J/ψφ)<1.9×10-7 at 90% confidence level. © 2013 CERN.

First observation of B̄0→J/ψK+K - and search for B̄0→J/ψφ decays / Aaij, R., Adeva, B., Adinolfi, M., Adrover, C., Affolder, A., Ajaltouni, Z., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A.A., Amato, S., Amerio, S., Amhis, Y., Anderlini, L., Anderson, J., Andreassen, R., Andrews, J.E., et al.. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - 88:7(2013), pp. N/A-N/A. [10.1103/PhysRevD.88.072005]

First observation of B̄0→J/ψK+K - and search for B̄0→J/ψφ decays

Bizzeti A.;
2013

Abstract

The first observation of the B̄0→J/ψK +K- decay is presented with a data sample corresponding to an integrated luminosity of 1.0 fb-1 of pp collisions at a center-of-mass energy of 7 TeV collected with the LHCb detector. The branching fraction is measured to be B(B̄0→J/ψK+K -)=(2.53±0.31±0.19)×10-6, where the first uncertainty is statistical and the second is systematic. An amplitude analysis of the final state in the B̄0→J/ψK +K- decay is performed to separate resonant and nonresonant contributions in the K+K- spectrum. Evidence of the a0(980) resonance is reported with statistical significance of 3.9 standard deviations. The corresponding product branching fraction is measured to be B(B̄0→J/ψa0(980),a 0(980)→K+K-)=(4.70±3.31±0. 72)×10-7, yielding an upper limit of B(B ̄0→J/ψa0(980),a0(980)→K +K-)<9.0×10-7 at 90% confidence level. No evidence of the resonant decay B̄0→J/ψφ is found, and an upper limit on its branching fraction is set to be B(B ̄0→J/ψφ)<1.9×10-7 at 90% confidence level. © 2013 CERN.
2013
88
7
N/A
N/A
First observation of B̄0→J/ψK+K - and search for B̄0→J/ψφ decays / Aaij, R., Adeva, B., Adinolfi, M., Adrover, C., Affolder, A., Ajaltouni, Z., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A.A., Amato, S., Amerio, S., Amhis, Y., Anderlini, L., Anderson, J., Andreassen, R., Andrews, J.E., et al.. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - 88:7(2013), pp. N/A-N/A. [10.1103/PhysRevD.88.072005]
Aaij, R.; Adeva, B.; Adinolfi, M.; Adrover, C.; Affolder, A.; Ajaltouni, Z.; Albrecht, J.; Alessio, F.; Alexander, M.; Ali, S.; Alkhazov, G.; Alvarez ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1209206
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