Measurement of {Mathematical expression} correlations at the CERN {Mathematical expression} collider

C. Albajar, K. Ankoviak, S. Bartha, 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. Denegri, H. DibonJ. 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. Karimaki, I. Kenyon, R. Kinnunen, M. Krammer, S. Lammel, M. P.J. Landon, Y. Lemoigne, S. Levegrün, P. Lipa, C. Markou, M. Markytan

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Abstract

We report on measurements of correlated {Mathematical expression} production in {Mathematical expression} collisions at {Mathematical expression}, using dimuon data to tag both the b and {Mathematical expression} quarks. Starting from an inclusive dimuon sample we obtain improved cross-sections for single inclusive beauty production and confirm our earlier results on {Mathematical expression} mixing. From a study of {Mathematical expression} correlations we derive explicit cross-sections for semi-differential {Mathematical expression} production. We compare the measured cross-sections and correlations to {Mathematical expression} QCD predictions and find good quantitative agreement. From the measured angular distributions we establish a size-able contribution from higher order QCD processes with a significance of about seven standard deviations. A large nonperturbative contribution to these higher order corrections is excluded.

Original languageEnglish (US)
Pages (from-to)41-52
Number of pages12
JournalZeitschrift für Physik C Particles and Fields
Volume61
Issue number1
DOIs
StatePublished - Mar 1994

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