A precise determination of the effective Bs0→K+K− lifetime can be used to constrain contributions from physics beyond the Standard Model in the Bs0 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−11.0 fb−1 of data recorded by the LHCb experiment, the effective Bs0→K+K− lifetime is measured as 1.455±0.046(stat.)±0.006(syst.)ps.

Measurement of the effective Bs0→K+K− lifetime

CARDINALE, ROBERTA;FONTANELLI, FLAVIO;PATRIGNANI, CLAUDIA;PETROLINI, ALESSANDRO;SANNINO, MARIO;
2012

Abstract

A precise determination of the effective Bs0→K+K− lifetime can be used to constrain contributions from physics beyond the Standard Model in the Bs0 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−11.0 fb−1 of data recorded by the LHCb experiment, the effective Bs0→K+K− lifetime is measured as 1.455±0.046(stat.)±0.006(syst.)ps.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11567/696000
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