TY - JOUR

T1 - A precise measurement of ΓZ→b/ΓZ→hadrons

AU - Buskulic, D.

AU - Finch, Alexander

AU - ALEPH Collaboration

PY - 1993

Y1 - 1993

N2 - A measurement of the partial width ratio using a method which tags the decays through the lif etime of the produced heavy hadrons is presented. This method relies on the tracking precision afforded by a double-sided silicon vertex detector. The tag algorithm makes a probabilistic interpretation of three-dimensional track impact parameters, using the data to measure the resolution. By tagging the two b hadrons separately, both and the tag efficiency can be determined from the data. For a 26% efficiency of tagging a single b hadron within the vertex detector solid angle coverage, a purity of 96% is achieved. A value of is found. Combining this result with other recent ALEPH measurements gives a 95% confidence upper limit on the Standard Model top mass of Mt < 228 GeV.

AB - A measurement of the partial width ratio using a method which tags the decays through the lif etime of the produced heavy hadrons is presented. This method relies on the tracking precision afforded by a double-sided silicon vertex detector. The tag algorithm makes a probabilistic interpretation of three-dimensional track impact parameters, using the data to measure the resolution. By tagging the two b hadrons separately, both and the tag efficiency can be determined from the data. For a 26% efficiency of tagging a single b hadron within the vertex detector solid angle coverage, a purity of 96% is achieved. A value of is found. Combining this result with other recent ALEPH measurements gives a 95% confidence upper limit on the Standard Model top mass of Mt < 228 GeV.

U2 - 10.1016/0370-2693(93)90028-G

DO - 10.1016/0370-2693(93)90028-G

M3 - Journal article

VL - 313

SP - 535

EP - 548

JO - Physics Letters B

JF - Physics Letters B

SN - 0370-2693

IS - 3-4

ER -