Measurement Of The B-Hadron Lifetime

W. W. Ash, H. R. Band, E. D. Bloom,M. Bosman, T. Camporesi,G. B. Chadwick,M. C. Delfino,R. De Sangro, W. T. Ford,M. W. Gettner,G. P. Goderre, Idl G. L. Godfrey,D. E. Groom, R. B. Hurst,J. R. Johnson,K. H. Lau,T. L. Lavine,R. E. Leedy,T. Maruyama,R. L. Messner,J. H. Moromisato,L. J. Moss, F. Muller,H. N. Nelson,I. Peruzzi,M. Piccolo,R. Prepost,J. Pyrlik,N. Qi, A. L. Read,D. M. Ritson,L. J. Rosenberg,W. D. Shambroom,J. C. Sleeman,J. G. Smith, P. G. Verdini,E. von Goeler,H. B. Wald,R. Weinstein,D. E. Wiser,R. W. Zdarko

PHYSICS LETTERS B（1991）

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摘要

The average lifetime of B hadrons has been measured by the ALEPH experiment at LEP. Events containing B hadrons are selected by the identification of leptons with high transverse momentum in hadronic Z decays, and the lifetime is extracted from a fit to the impact parameter distribution of the lepton tracks. From a sample of 1.7 x 10(5) hadronic Z decays a lifetime of 1.29 +/- 0.06 +/- 0.10 ps is measured.

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关键词

radiation detector,elementary particles,data collection

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