Measurement of the effective Bs0→K+K- lifetime

The LHCb Collaboration

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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-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.

Original languageEnglish
Pages (from-to)393-400
Number of pages8
JournalPhysics Letters B
Issue number3-5
Publication statusPublished - 2 Oct 2012
Externally publishedYes


  • B physics
  • Flavour physics
  • Lifetime

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