A precise determination of the effective B-s(0) -> K+ K- lifetime can be used to constrain contributions from physics beyond the Standard Model in the B-s(0) 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 B-s(0) -> K+ K- lifetime is measured as 1.455 +/- 0.046 (stat.) +/- 0.006 (syst.) ps. (c) 2012 CERN. Published by Elsevier B.V. All rights reserved.

Aaij, R., Beteta, C., Adametz, A., Adeva, B., Adinolfi, M., Adrover, C., et al. (2012). Measurement of the effective B-s(0) -> K+ K- lifetime. PHYSICS LETTERS. SECTION B, 716(3-5), 393-400 [10.1016/j.physletb.2012.08.033].

Measurement of the effective B-s(0) -> K+ K- lifetime

Archilli, F;CARBONI, GIOVANNI;SANTOVETTI, EMANUELE;
2012-01-01

Abstract

A precise determination of the effective B-s(0) -> K+ K- lifetime can be used to constrain contributions from physics beyond the Standard Model in the B-s(0) 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 B-s(0) -> K+ K- lifetime is measured as 1.455 +/- 0.046 (stat.) +/- 0.006 (syst.) ps. (c) 2012 CERN. Published by Elsevier B.V. All rights reserved.
2012
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/04 - FISICA NUCLEARE E SUBNUCLEARE
English
Con Impact Factor ISI
Aaij, R., Beteta, C., Adametz, A., Adeva, B., Adinolfi, M., Adrover, C., et al. (2012). Measurement of the effective B-s(0) -> K+ K- lifetime. PHYSICS LETTERS. SECTION B, 716(3-5), 393-400 [10.1016/j.physletb.2012.08.033].
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