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).
Measurement of the effective B-S(0) -> K+K- lifetime
VELTRI, MICHELE;
2012
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).I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.