ALEPH's published measurement of R-b = Gamma(Z --> b (b) over bar)/Gamma(Z --> hadrons) using a lifetime tag is updated using the full LEP 1 data sample. Considerable effort has been devoted to understanding systematic effects. Charm background is better controlled by combining the lifetime tag with a tag based on the b/c hadron mass difference. Furthermore, the algorithm used to reconstruct the event primary vertex is designed so as to reduce correlations between the two hemispheres of an event. The value of R-b is measured to be 0.2167 +/- 0.0011(stat) +/- 0.0013(syst).

R., B., D., B., D., D., P., G., C., G., J. P., L., et al. (1997). A measurement of R-b using a lifetime-mass tag. PHYSICS LETTERS. SECTION B, 401(1-2), 150-162 [10.1016/S0370-2693(97)00406-1].

A measurement of R-b using a lifetime-mass tag

CIOCCI, MARIA AGNESE;MARROCCHESI, PIER SIMONE;
1997-01-01

Abstract

ALEPH's published measurement of R-b = Gamma(Z --> b (b) over bar)/Gamma(Z --> hadrons) using a lifetime tag is updated using the full LEP 1 data sample. Considerable effort has been devoted to understanding systematic effects. Charm background is better controlled by combining the lifetime tag with a tag based on the b/c hadron mass difference. Furthermore, the algorithm used to reconstruct the event primary vertex is designed so as to reduce correlations between the two hemispheres of an event. The value of R-b is measured to be 0.2167 +/- 0.0011(stat) +/- 0.0013(syst).
1997
R., B., D., B., D., D., P., G., C., G., J. P., L., et al. (1997). A measurement of R-b using a lifetime-mass tag. PHYSICS LETTERS. SECTION B, 401(1-2), 150-162 [10.1016/S0370-2693(97)00406-1].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/38444
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