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.

Observation of the Annihilation Decay Mode B0 →k+K- / Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A.A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Andreassi, G., Andreotti, M., Andrews, J.E., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 118:8(2017). [10.1103/PhysRevLett.118.081801]

Observation of the Annihilation Decay Mode B0 →k+K-

Capriotti, L.;Casse, G.;Sarti, A.;Sciubba, A.;
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
Bottom mesons, Charmed mesons,Flavour changing neutral currents,
01 Pubblicazione su rivista::01a Articolo in rivista
Observation of the Annihilation Decay Mode B0 →k+K- / Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., Alessio, F., Alexander, M., Ali, S., Alkhazov, G., Alvarez Cartelle, P., Alves, A.A., Amato, S., Amerio, S., Amhis, Y., An, L., Anderlini, L., Andreassi, G., Andreotti, M., Andrews, J.E., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 118:8(2017). [10.1103/PhysRevLett.118.081801]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1074604
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