Abstract
We report on a measurement of the flavor-specific lifetime and of the lifetime using proton-proton collisions at center-of-mass energies of 7 and 8 TeV, collected by the LHCb experiment and corresponding to of integrated luminosity. Approximately 407 000 decays are partially reconstructed in the final state. The and natural widths are determined using, as a reference, kinematically similar decays reconstructed in the same final state. The resulting differences between widths of and mesons and of and mesons are and , respectively. Combined with the known and lifetimes, these yield the flavor-specific lifetime, and the lifetime, . The last uncertainties originate from the limited knowledge of the and lifetimes. The results improve upon current determinations.
- Received 10 May 2017
DOI:https://doi.org/10.1103/PhysRevLett.119.101801
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
© 2017 CERN, for the LHCb Collaboration