A search for the B0 → K+ K− decay is performed using pp-collision data collected by LHCb. The data set corresponds to integrated luminosities of 1.0 and 2.0 fb^−1 at center-of-mass energies of 7 and 8 TeV, respectively. This decay is observed for the first time, with a significance of more than 5 standard deviations. The analysis also results in an improved measurement of the branching fraction for the B0s → π+ π− decay. The measured branching fractions are B(B0 → K+ K−) = (7.80 ± 1.27 ± 0.81 ± 0.21) × 10^−8 and B(B0s → π+ π−) = (6.91 ± 0.54 ± 0.63 ± 0.19 ± 0.40) × 10^−7. The first uncertainty is statistical, the second is systematic, the third is due to the uncertainty on the B0 → K+ π− branching fraction used as a normalization. For the B0s mode, the fourth accounts for the uncertainty on the ratio of the probabilities for b quarks to hadronize into B0s and B0 mesons.

Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., et al. (2017). Observation of the Annihilation Decay Mode B0 → K+ K−. PHYSICAL REVIEW LETTERS, 118(8), 1-9 [10.1103/PhysRevLett.118.081801].

Observation of the Annihilation Decay Mode B0 → K+ K−

BETTI, FEDERICO;Capriotti, L.;CARBONE, ANGELO;FERRARI, FABIO;GALLI, DOMENICO;MUSSINI, MANUEL;PATRIGNANI, CLAUDIA;PERAZZINI, STEFANO;VAGNONI, VINCENZO MARIA;ZUCCHELLI, STEFANO
2017

Abstract

A search for the B0 → K+ K− decay is performed using pp-collision data collected by LHCb. The data set corresponds to integrated luminosities of 1.0 and 2.0 fb^−1 at center-of-mass energies of 7 and 8 TeV, respectively. This decay is observed for the first time, with a significance of more than 5 standard deviations. The analysis also results in an improved measurement of the branching fraction for the B0s → π+ π− decay. The measured branching fractions are B(B0 → K+ K−) = (7.80 ± 1.27 ± 0.81 ± 0.21) × 10^−8 and B(B0s → π+ π−) = (6.91 ± 0.54 ± 0.63 ± 0.19 ± 0.40) × 10^−7. The first uncertainty is statistical, the second is systematic, the third is due to the uncertainty on the B0 → K+ π− branching fraction used as a normalization. For the B0s mode, the fourth accounts for the uncertainty on the ratio of the probabilities for b quarks to hadronize into B0s and B0 mesons.
2017
Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., et al. (2017). Observation of the Annihilation Decay Mode B0 → K+ K−. PHYSICAL REVIEW LETTERS, 118(8), 1-9 [10.1103/PhysRevLett.118.081801].
Aaij, R.; Adeva, B.; Adinolfi, M.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; Alessio, F.; Alexander, M.; Ali, S.; Alkhazov, G.; Alvarez Cartelle, P.; Alv...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/579011
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