An Improved Test of the Flavor Independence of Strong Interactions

Details An Improved Test of the Flavor Independence of Strong Interactions An Improved Test of the Flavor Independence of Strong Interactions

1998-05-20

arxiv.org/abs/hep-ex/9805023v1

Phys.Rev.D59:012002,1999

Physics

High Energy Physics

High Energy Physics - Experiment

38 pages latex including 8 embedded eps figures

Scientific paper

10.1103/PhysRevD.59.012002

We present an improved comparison of the strong coupling of the gluon to light (q_l=u+d+s), c, and b quarks, determined from multijet rates in flavor-tagged samples of hadronic Z0 decays recorded with the SLC Large Detector at the SLAC Linear Collider between 1993 and 1995. Flavor separation among primary q_l q_l-bar, c c-bar, and b b-bar final states was made on the basis of the reconstructed mass of long-lived heavy-hadron decay vertices, yielding tags with high purity and low bias against >= 3-jet final states. We find alpha_s^c/alpha_s^uds = 1.036+-0.043 (stat) +0.041-0.045 (syst) +0.020-0.018 (theory) and alpha_s^b/alpha_s^uds = 1.004+-0.018 (stat) +0.026-0.031 (syst) +0.018-0.029 (theory).

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