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A Measurement of the b-quark Mass from Hadronic Z Decays

R. Barate 1 D. Decamp 1 P. Ghez 1 C. Goy 1 J P. Lees 1 E. Merle 1 M N. Minard 1 B. Pietrzyk 1 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 G. Boix O. Buchmuller M. Cattaneo F. Cerutti G. Dissertori H. Drevermann R W. Forty M. Frank T C. Greening a W. Halley J B. Hansen J. Harvey P. Janot B. Jost I. Lehraus P. Mato A. Minten A. Moutoussi F. Ranjard L. Rolandi D. Schlatter M. Schmitt O. Schneider P. Spagnolo W. Tejessy F. Teubert E. Tournefier a E. Wright Ziad Ajaltouni 2 F. Badaud 2 G. Chazelle 2 O. Deschamps 2 Alain Falvard 2 Pascal Gay 2 C. Guicheney 2 Pierre Henrard 2 J. Jousset 2 B. Michel 2 S. Monteil 2 Jean-Claude Montret 2 D. Pallin 2 Pascal Perret 2 F. Podlyski 2 J D. Hansen J R. Hansen P H. Hansen B S. Nilsson A. Waananen G. Daskalakis A. Kyriakis C. Markou E. Simopoulou A. Vayaki A. Blondel 3 G. Bonneaud 3 J C. Brient 3 A. Rouge 3 M. Rumpf 3 M. Swynghedauw M. Verderi H. Videau 3 E. Focardi G. Parrini K. Zachariadou A. Antonelli M. Antonelli G. Bencivenni G. Bologna F. Bossi P. Campana G. Capon V. Chiarella P. Laurelli G. Mannocchi F. Murtas G P. Murtas L. Passalacqua M. Pepe-Altarelli J G. Lynch P. Negus V. O'Shea C. Raine P. Teixeira-Dias a S. Thompson R. Cavanaugh S. Dhamotharan C. Geweniger P. Hanke G. Hansper V. Hepp E E. Kluge A. Putzer J. Sommer K. Tittel S. Werner M. Wunsch R. Beuselinck D M. Binnie W. Cameron P J. Dornan M. Girone N. Marinelli J K. Sedgbeer J C. Thompson E. Thomson V M. Ghete P. Girtler E. Kneringer D. Kuhn G. Rudolph C K. Bowdery P G. Buck a J. Finch F. Foster G. Hughes R W L. Jones N A. Robertson I. Giehl K. Jakobs K. Kleinknecht G. Quast B. Renk E. Rohne H G. Sander H. Wachsmuth C. Zeitnitz A. Bonissent 4 J. Carr 4 P. Coyle 4 O. Leroy 4 P. Payre 4 D. Rousseau 4 M. Talby 4 M. Aleppo F. Ragusa H. Dietl G. Ganis A. Heister K. Huttmann G. Lutjens C. Mannert W. Manner H G. Moser S. Schael R. Settles H. Stenzel W. Wiedenmann G. Wolf P. Azzurri 5 J. Boucrot 5 O. Callot 5 S. Chen 5 A. Cordier 5 M. Davier 5 L. Duflot 5 J F. Grivaz 5 P. Heusse 5 A. Jacholkowska 5 F. Le Diberder 5 J. Lefrancois 5 a M. Lutz 5 M H. Schune 5 J J. Veillet 5 I. Videau 5 D. Zerwas 5 G. Bagliesi T. Boccali G. Calderini V. Ciulli L. Foa A. Giassi F. Ligabue A. Messineo F. Palla G. Rizzo G. Sanguinetti A. Sciaba G. Sguazzoni R. Tenchini A. Venturi P G. Verdini G A. Blair G. Cowan M G. Green T. Medcalf J A. Strong J H. von Wimmersperg-Toeller 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 S N. Black J H. Dann R P. Johnson H Y. Kim N. Konstantinidis a M. Litke M A. Mcneil G. Taylor C N. Booth S. Cartwright F. Combley M. Lehto L F. Thompson K. Affholderbach A. Bohrer S. Brandt C. Grupen A. Misiejuk G. Prange U. Sieler G. Giannini B. Gobbo J E. Rothberg S. Wasserbaech S R. Armstrong K. Cranmer P. Elmer D P S. Ferguson Y. Gao S. Gonzalez O J. Hayes H. Hu S. Jin J. Kile P A. Mcnamara J. Nielsen W. Orejudos y B. Pan Y. Saadi I J. Scott J. Walsh S L. Wu X. Wu G. Zobernig
Abstract : Hadronic Z decay data taken with the ALEPH detector at LEP1 are used to measure the three-jet rate as well as moments of various event-shape variables. The ratios of the observables obtained from b-tagged events and from an inclusive sample are determined. The mass of the $b$ quark is extracted from a fit to the measured ratios using a next-to-leading order prediction including mass effects. Taking the first moment of the y_3 distribution, which is the observable with the smallest hadronization corrections and systematic uncertainties, the result is m_b(M_Z) = [3.27 +- 0.22(stat) +- 0.22(exp) +- 0.38(had) +- 0.16(theo)] GeV/c2. The measured ratio is alternatively employed to test the flavour independence of the strong coupling constant for b and light quarks.
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Submitted on : Monday, March 19, 2001 - 12:57:58 PM
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R. Barate, D. Decamp, P. Ghez, C. Goy, J P. Lees, et al.. A Measurement of the b-quark Mass from Hadronic Z Decays. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2000, 18, pp.1-13. ⟨in2p3-00007832⟩

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