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oai:recercat.cat:2445/1957202025-12-05T16:43:31Zcom_2072_1057col_2072_478823col_2072_478917

00925njm 22002777a 4500 dc Garrido Beltrán, Lluís author Graciani Díaz, Ricardo author Graugés Pous, Eugeni author LHCb Collaboration author 2023-03-21T12:00:11Z 2023-03-21T12:00:11Z 2012-07 2023-03-21T12:00:11Z A precise determination of the effective B0 s → K + K − lifetime can be used to constrain contributions from physics beyond the Standard Model in the B0 s meson system. Conventional approaches select B meson decay products that are significantly displaced from the B meson production vertex. As a consequence, B mesons with low decay times are suppressed, introducing a bias to the decay time spectrum which must be corrected. This analysis uses a technique that explicitly avoids a lifetime bias by using a neural network based trigger and event selection. Using 1.0 fb−1 of data recorded by the LHCb experiment, the effective B0 s → K + K − lifetime is measured as 1.455 ± 0.046 (stat.) ± 0.006 (syst.) ps. © 2012 CERN. Published by Elsevier B.V. All rights reserved. Física de partícules Mesons (Física nuclear) Experiments Gran Col·lisionador d'Hadrons Particle physics Mesons (Nuclear physics) Experiments Large Hadron Collider (France and Switzerland) Measurement of the effective B0s→K+K− lifetime