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 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 -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. © 2012 CERN
Aaij, R., Abellan 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
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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 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 -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. © 2012 CERN
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