# Measurement of the effective $B_s^0 \rightarrow K^+ K^-$ lifetime

Abstract : A precise determination of the effective $B_s^0 \rightarrow K^+ K^-$ 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 $B_s^0 \rightarrow K^+ K^-$ lifetime is measured as $1.455 \pm 0.046 \; \mathrm{(stat.)} \pm 0.006 \; \mathrm{(syst.)} \, \mathrm{ps}.$
Document type :
Journal articles
Physics Letters B, Elsevier, 2012, 716, pp.393-400. <10.1016/j.physletb.2012.08.033>
Domain :

http://hal.in2p3.fr/in2p3-00720941
Contributor : Françoise Marechal <>
Submitted on : Thursday, July 26, 2012 - 11:20:36 AM
Last modification on : Monday, September 17, 2012 - 9:54:47 AM

### Citation

R. Aaij, S. Barsuk, O. Callot, J. He, B. Jean-Marie, et al.. Measurement of the effective $B_s^0 \rightarrow K^+ K^-$ lifetime. Physics Letters B, Elsevier, 2012, 716, pp.393-400. <10.1016/j.physletb.2012.08.033>. <in2p3-00720941>

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