We report on measurements of the mass and lifetime of the Ξ-b baryon using about 1800 Ξ-b decays reconstructed in a proton-proton collision data set corresponding to an integrated luminosity of 3.0 fb-1, collected by the LHCb experiment. The decays are reconstructed in the Ξ-b → Ξ0cπ-, Ξ0c → pK-K-π+, channel and the mass and lifetime are measured using the Λ0b → Λ+Cπ-, mode as a reference. We measure M (Ξ-b) - M(Λ0b)= 178.36 ± 0.46 ± 0.16 MeV=c2, (τξ-B/τΛ0b) = 1.089 ± 0.026 ± 0.011, where the uncertainties are statistical and systematic, respectively. These results lead to a factor of 2 better precision on the Ξ-b mass and lifetime compared to previous best measurements, and are consistent with theoretical expectations.

Precision measurement of the mass and lifetime of the Ξ-b baryon / Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., 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., Anderson, J., Andreassen, R., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 113:24(2014), pp. N/A-N/A. [10.1103/PhysRevLett.113.242002]

Precision measurement of the mass and lifetime of the Ξ-b baryon

Bizzeti A.;
2014

Abstract

We report on measurements of the mass and lifetime of the Ξ-b baryon using about 1800 Ξ-b decays reconstructed in a proton-proton collision data set corresponding to an integrated luminosity of 3.0 fb-1, collected by the LHCb experiment. The decays are reconstructed in the Ξ-b → Ξ0cπ-, Ξ0c → pK-K-π+, channel and the mass and lifetime are measured using the Λ0b → Λ+Cπ-, mode as a reference. We measure M (Ξ-b) - M(Λ0b)= 178.36 ± 0.46 ± 0.16 MeV=c2, (τξ-B/τΛ0b) = 1.089 ± 0.026 ± 0.011, where the uncertainties are statistical and systematic, respectively. These results lead to a factor of 2 better precision on the Ξ-b mass and lifetime compared to previous best measurements, and are consistent with theoretical expectations.
2014
113
24
N/A
N/A
Precision measurement of the mass and lifetime of the Ξ-b baryon / Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., 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., Anderson, J., Andreassen, R., et al.. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 113:24(2014), pp. N/A-N/A. [10.1103/PhysRevLett.113.242002]
Aaij, R.; Adeva, B.; Adinolfi, M.; Affolder, A.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; Alessio, F.; Alexander, M.; Ali, S.; Alkhazov, G.; Alvarez Car...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1210285
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