Measurement of Rb and Br(b →ℓνX) at LEP using double-tag methods

Acciarri, M. ; Achard, P. ; Adriani, O. ; Aguilar-Benitez, M. ; Gurtu, A. ; et., al (2000) Measurement of Rb and Br(b →ℓνX) at LEP using double-tag methods European Physical Journal C (EPJ C), The Particles and Fields, 13 (1). pp. 47-61. ISSN 1434-6044

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We present a combined measurement of and the semileptonic branching ratio of b quarks in Z decays, , using double-tag methods. Two analyses are performed on one million hadronic Z decays collected in 1994 and 1995. The first analysis exploits the capabilities of the silicon microvertex detector. The tagging of b-events is based on the large impact parameter of tracks from weakly decaying b-hadrons with respect to the collision point. In the second analysis, a high- lepton tag is used to enhance the b-component in the sample and its momentum spectrum is used to constrain the model dependent uncertainties in the semileptonic b-decay. The analyses are combined in order to provide precise determinations.

Item Type:Article
Source:Copyright of this article belongs to Springer.
ID Code:83554
Deposited On:21 Feb 2012 12:53
Last Modified:21 Feb 2012 12:53

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