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Measurements of the Strong Coupling Constant and the QCD Colour Factors using Four-jet Observables from Hadronic Z Decays

A. Heister S. Schael R. Barate 1 I. de Bonis 1 D. Decamp 1 C. Goy 1 J P. Lees 1 E. Merle 1 M N. Minard 1 B. Pietrzyk 1 G. Boix S. Bravo M P. Casado M. Chmeissani J M. Crespo E. Fernandez M. Fernandez-Bosman L. Garrido E. Grauges M. Martinez G. Merino R. Miquel L M. Mir A. Pacheco H. Ruiz A. Colaleo D. Creanza M. de Palma G. Iaselli G. Maggi M. Maggi S. Nuzzo A. Ranieri G. Raso F. Ruggieri G. Selvaggi L. Silvestris P. Tempesta A. Tricomi G. Zito X. Huang Jiali Lin Q. Ouyang T. Wang Y. Xie R. Xu S. Xue J. Zhang L. Zhang W. Zhao D. Abbaneo P. Azzurri O. Buchmueller M. Cattaneo F. Cerutti B. Clerbaux H. Drevermann R W. Forty M. Frank F. Gianotti T C. Greening J B. Hansen J. Harvey D E. Hutchcroft P. Janot B. Jost M. Kado P. Mato A. Moutoussi F. Ranjard L. Rolandi D. Schlatter O. Schneider G. Sguazzoni W. Tejessy F. Teubert A. Valassi I. Videau J. Ward F. Badaud 2 Alain Falvard 2, 3 Pascal Gay 2 Pierre Henrard 2 J. Jousset 2 B. Michel 2 S. Monteil 2 Jean-Claude Montret 2 D. Pallin 2 Pascal Perret 2 J D. Hansen J R. Hansen P H. Hansen B S. Nilsson A. Kyriakis C. Markou E. Simopoulou A. Vayaki K. Zachariadou A. Blondel 4 G. Bonneaud 4 J C. Brient 4 A. Rouge 4 M. Rumpf 4 M. Swynghedauw 4 M. Verderi 4 H. Videau 4 V. Ciulli E. Focardi G. Parrini A. Antonelli M. Antonelli G. Bencivenni F. Bossi P. Campana G. Capon V. Chiarella P. Laurelli G. Mannocchi F. Murtas G P. Murtas L. Passalacqua M. Pepe-Altarelli A. Halley J G. Lynch P. Negus V. O'Shea C. Raine a S. Thompson S. Wasserbaech R. Cavanaugh S. Dhamotharan C. Geweniger P. Hanke V. Hepp E E. Kluge A. Putzer H. Stenzel K. Tittel M. Wunsch R. Beuselinck D M. Binnie W. Cameron P J. Dornan M. Girone N. Marinelli J K. Sedgbeer J C. Thompson V M. Ghete P. Girtler E. Kneringer D. Kuhn G. Rudolph E. Bouhova-Thacker C K. Bowdery a J. Finch F. Foster G. Hughes R W L. Jones M R. Pearson N A. Robertson K. Jakobs K. Kleinknecht G. Quast B. Renk H G. Sander H. Wachsmuth C. Zeitnitz A. Bonissent 5 P. Coyle 5 O. Leroy 5 P. Payre 5 D. Rousseau 5 M. Talby 5 F. Ragusa A. David H. Dietl G. Ganis K. Huettmann G. Luetjens W. Maenner H G. Moser R. Settles G. Wolf J. Boucrot 6 O. Callot 6 M. Davier 6 L. Duflot 6 J F. Grivaz 6 P. Heusse 6 A. Jacholkowska 3, 6 J. Lefrancois 6 J J. Veillet 6 C. Yuan 6 G. Bagliesi T. Boccali L. Foa A. Giammanco A. Giassi F. Ligabue A. Messineo F. Palla G. Sanguinetti A. Sciaba P. Spagnolo R. Tenchini A. Venturi P G. Verdini Z. Xie G A. Blair G. Cowan M G. Green T. Medcalf A. Misiejuk J A. Strong P. Teixeira-Dias R W. Clifft T R. Edgecock P R. Norton I R. Tomalin B. Bloch-Devaux P. Colas S. Emery W. Kozanecki E. Lancon M C. Lemaire E. Locci P. Perez J. Rander J F. Renardy A. Roussarie J P. Schuller J. Schwindling A. Trabelsi B. Vallage N. Konstantinidis a M. Litke G. Taylor C N. Booth S. Cartwright F. Combley M H. Lehto L F. Thompson K. Affholderbach A. Boehrer S. Brandt C. Grupen A. Ngac G. Prange U. Sieler G. Giannini J E. Rothberg S R. Armstrong K. Berkelman K. Cranmer D P S. Ferguson Y. Gao S. Gonzalez O J. Hayes H. Hu S. Jin J. Kile P A. Mcnamara J. Nielsen y B. Pan J H. von Wimmersperg-Toeller W. Wiedenmann J. Wu S L. Wu X. Wu G. Zobernig
Abstract : Data from e+e- annihilation into hadrons, taken with the ALEPH detector at the Z resonance, are analyzed. The four-jet rate is studied as a function of the resolution parameter and compared to next-to-leading order calculations combined with resummation of large logarithms. Angular correlations in four-jet events are measured and compared to next-to-leading order QCD predictions. With these observables two different measurements are performed. In a first analysis the strong coupling constant is measured from the four-jet rate yielding alpha_s(M_ Z}) = 0.1170 \pm 0.0001(stat) \pm 0.0014(sys) In a second measurement the strong coupling constant and the \textsc{QCD} colour factors are determined simultaneously from a fit to the four-jet rate and the four-jet angular correlations, giving alpha_s(M_ Z) = 0.119 \pm 0.006(stat) \pm 0.026 (sys) C_A = 2.93 \pm 0.14(stat) \pm 0.58 (sys) C_F} = 1.35 \pm 0.07 (stat) \pm 0.26 (sys) in good agreement with the expectation from QCD.
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Submitted on : Thursday, March 27, 2003 - 11:52:10 AM
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A. Heister, S. Schael, R. Barate, I. de Bonis, D. Decamp, et al.. Measurements of the Strong Coupling Constant and the QCD Colour Factors using Four-jet Observables from Hadronic Z Decays. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2003, 27, pp.1-17. ⟨in2p3-00012259⟩

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