A Precision measurement of the average lifetime of B hadrons
1994
The average lifetime ofB
hadronswas measured using data collected with the DELPHI detector at the LEP collider during 1991 and 1992. The measurement was performed using two different anayses. The first method was an improvement on a previous technique, which used charged particle
impact parameterdistributions. This analysis measured an average lifetime
forB
hadronsof (1) τB=1.542±0.021(
stat.)±0.045(syst.)ps. The second method was based on a new technique, which used inclusively reconstructed secondary vertices to measure (2) τB=1.599±0.014(
stat.)±0.035(syst.)ps. Taking into account both the statistical and systematic
corelations, the results of these two methods were combined to give an average lifetime
forB
hadronsof (3) τB=1.582±0.012(
stat.)±0.032(syst.)ps.
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