Measurement of {ital R}{sub {ital b}} Using a Vertex Mass Tag
Journal Article
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· Physical Review Letters
OSTI ID:627535
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- Adelphi University, Garden City, New York 11530 (United States)
- INFN Sezione di Bologna, I-40126 Bologna (Italy)
- Boston University, Boston, Massachusetts 02215 (United States)
- Brunel University, Uxbridge, Middlesex UB8 3PH (United Kingdom)
- University of California at Santa Barbara, Santa Barbara, California 93106 (United States)
- University of California at Santa Cruz, Santa Cruz, California 95064 (United States)
- University of Cincinnati, Cincinnati, Ohio 45221 (United States)
- Colorado State University, Fort Collins, Colorado 80523 (United States)
- University of Colorado, Boulder, Colorado 80309 (United States)
- Columbia University, New York, New York 10027 (United States)
- INFN Sezione di Ferrara and Universita di Ferrara, I-44100 Ferrara (Italy)
- INFN Laboratori Nazionali di Frascati, I-00044 Frascati (Italy)
- University of Illinois, Urbana, Illinois 61801 (United States)
- E.O. Lawrence Berkeley Laboratory, University of California, Berkeley, California 94720 (United States)
We report a new measurement of R{sub b}={Gamma}{sub Z{sup 0}{r_arrow}b{bar b}} /{Gamma}{sub Z{sup 0}{r_arrow}hadrons} using a double tag technique, where the b hemisphere selection is based on the reconstructed mass of the B hadron decay vertex. The measurement was performed using a sample of 130{times}10{sup 3} hadronic Z{sup 0} events, collected with the SLD detector at SLC. The method utilizes the 3D vertexing abilities of the CCD pixel vertex detector and the small stable SLC beams to obtain a high b -tagging efficiency and purity. We obtain R{sub b}=0.2142{plus_minus}0.0034(stat) {plus_minus}0.0015(syst){plus_minus}0.0002( R{sub c}) . {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 627535
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 4 Vol. 80; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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