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An Improved Test of the Flavor Independence of Strong Interactions


We present an improved comparison of the strong coupling of the gluon to light (ql =u+d+s), c, and b quarks, determined from multijet rates in avor-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 ql antiql , c anti-c, and b anti-b 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: alphacs/alphaudss = 1.036 +/- 0.043 (stat.)+0.041-0.045 (syst.)+0.020-0.018 (theory) and alphabs/alphaudss=1.004 +/- 1.018 (stat.)+0.026-0.031 (syst.)+0.018-0.029 (theory).

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