Measurement of the average lifetime of b-hadrons in Z decays

Wang, X. L. ; Wang, Z. M. ; Weber, A. ; Wu, S. X. ; Wynhoff, S. ; Xu, J. ; Xu, Z. Z. ; Yang, B. Z. ; Yang, C. G. ; Yao, X. Y. ; Ye, J. B. ; Yeh, S. C. ; You, J. M. ; Zalite, An ; Zalite, Yu ; Zemp, P. ; Zeng, Y. ; Zhang, Z. ; Zhang, Z. P. ; Zhou, B. ; Zhou, Y. ; Zhu, G. Y. ; Zhu, R. Y. ; Zichichi, A. ; Ziegler, F. ; Gurtu, A. ; et., al (1998) Measurement of the average lifetime of b-hadrons in Z decays Physics Letters B: Nuclear Physics and Particle Physics, 416 (1-2). pp. 220-232. ISSN 0370-2693

Full text not available from this repository.

Official URL:

Related URL:


We present a measurement of the average b-hadron lifetime Tb at the e+e- collider LEP. Using hadronic Z decays collected in the period from 1991 to 1994, two independent analyses have been performed. In the first one, the b-decay position is reconstructed as a secondary vertex of hadronic b-decay particles. The second analysis is an updated measurement of Tb using the impact parameter of leptons with high momentum and high transverse momentum. The combined result is Tb=[1549± 9 (stat) ± 15 (syst)] fs . In addition, we measure the average charged b-decay multiplicity < nb > and the normalized average b-energy <xE>b at LEP to be <nb>=4.90±0.04 (stat)±0.11 (syst), <xE>b=0.709±0.004 (stat+syst).

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:11606
Deposited On:13 Nov 2010 14:10
Last Modified:02 Jun 2011 10:26

Repository Staff Only: item control page