Measurement of αs from bb̄ production at the cern pp̄ collider

C. Albajar, K. Ankoviak, S. Bartha, G. Bauer, A. Bezaguet, A. Böhrer, K. Bos, C. Buchanan, B. Buschbeck, H. Castilla-Valdez, P. Cennini, S. Cittolin, E. Clayton, D. Cline, J. A. Caughlan, D. Dau, C. Daum, M. della Negra, M. Demoulin, D. DenegriH. Dibon, J. Dorenbosch, J. D. Dowell, K. Eggert, E. Eisenhandler, N. Ellis, H. Evans, H. Faissner, I. F. Fensome, L. Fortson, J. Garvey, A. Geiser, A. Givernaud, A. Gonidec, B. Gonzalez, J. Gronberg, D. J. Holthuizen, W. Jank, G. Jorat, P. I.P. Kalmus, V. Karimäki, I. Kenyon, R. Kinnunen, M. Krammer, S. Lammel, M. P.J. Landon, Y. Lemoigne, S. Levegrün, P. Lipa, C. Markou

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Abstract

The UA1 Collaboration has recently improved its measurement of the beauty production cross-section by including explicit measurements of bb̄ 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(α3s) QCD predictions yields a measurement of αs(20 GeV) = 0.145+0.012 +0.013-0.010 exp -0.016 th, corresponding to αs(Mz) = 0.1131+0.007 +0.008-0.006 exp -0.009 th. 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.

Original languageEnglish (US)
Pages (from-to)46-54
Number of pages9
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume369
Issue number1
DOIs
StatePublished - Feb 15 1996

Bibliographical note

Funding Information:
We are thankful to the managementa nd staff of CERN and of all participating institutes for their vigorous support of the experiment.T he following funding agenciesh ave contributed to this programme: Fonds zur Fiirderung der Wissenschaftlichen Forschung, Austria; Valtion luonnontieteellinen toimikunta, Suomen Akatemia, Finland; Institut National de Physique Nucleaire et de Physique des Particules and Institut de Recherche Fondamen-tale (CEA), France; Bundesministerium fur Forschung und Technologie, Germany; Istituto Nationale di Fisica Nucleare, Italy; Science and Engineering Research Council, United Kingdom; Stichting Voor FundamenteelO nderzoek der Materie, The Netherlands; Centro de Investigaciones Energetica,M edioambien-tales y Tecnologicas (CIEMAT), Spain; Departmento f Energy, USA.

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