Measurement of αs from b overlineb production at the cern p overlinep collider
Abstract
The UA1 Collaboration has recently improved its measurement of the beauty production cross-section by including explicit measurements of b overlineb correlations. Using these data we have determined the strong coupling constant αs. The comparison of the measured cross-section for 2-body final states with O( αs3) QCD predictions yields a measurement of αs(20 GeV) = 0.145 -0.010 exp -0.016 th+0.012 +0.013, corresponding to αs( Mz) = 0.113 -0.006 exp -0.009 th+0.007 +0.008. This is the first theoretically well-defined measurement of αs from a purely hadronic production process. Evaluating αs from cross-sections at different Q2-values we find that the running of αs is needed for internal consistency of the UA1 data.
- Publication:
-
Physics Letters B
- Pub Date:
- February 1996
- DOI:
- 10.1016/0370-2693(95)01539-6
- Bibcode:
- 1996PhLB..369...46A