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A precise measurement of the B + , B0 and mean b-hadron lifetime with the DELPHI detector at LEP I

  • experimental physics
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Abstract.

Final results from the DELPHI Collaboration on the lifetime of B + and B0 mesons and the mean b-hadron lifetime, are presented using the data collected at the Z 0 peak in 1994 and 1995. Elaborate, inclusive, secondary vertexing methods have been employed to ensure a b-hadron reconstruction with good efficiency. To separate samples of B + and B0 mesons, high performance neural network techniques are used that achieve very high purity signals. The results obtained are: \( \tau_{\mathrm B}^ + = 1.624 \pm 0.014\;\;(stat) \pm 0.018\; (syst) ps \) \( \tau_{\mathrm B}^0\quad = 1.531 \pm 0.021 \;\;(stat)\pm 0.031 \; (syst) ps \) \( \frac{\tau_{{\mathrm B}^ + }}{\tau_{{\mathrm B}^0}} = 1.060 \pm 0.021 \;\;(stat)\pm 0.024\;(syst) \) and for the average b-hadron lifetime: \( \tau_{{\mathrm b}} = 1.570 \pm 0.005\;\;(stat) \pm 0.008 \; (syst) ps. \)

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Received: 6 October 2003, Revised: 12 December 2003, Published online: 25 February 2004

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The DELPHI Collaboration. A precise measurement of the B + , B0 and mean b-hadron lifetime with the DELPHI detector at LEP I. Eur. Phys. J. C 33, 307–324 (2004). https://doi.org/10.1140/epjc/s2004-01599-5

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