Improved test of the flavor independence of strong interactions

K. Abe, K. Abe, T. Abe, I. Adam, T. Akagi, N. J. Allen, A. Arodzero, W. W. Ash, D. Aston, K. G. Baird, C. Baltay, H. R. Band (+230 others)
1998 Physical Review D, Particles and fields  
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 >=
more » ... 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).
doi:10.1103/physrevd.59.012002 fatcat:tezepjwuufaezoj7titg5x44oe