ScienceDirect - Physics Letters B : The forward-backward asymmetry for charm quarks at the Z pole

Physics Letters B
Volume 352, Issues 3-4, 15 June 1995, Pages 479-486

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doi:10.1016/0370-2693(95)00519-Q

The forward-backward asymmetry for charm quarks at the Z pole

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D. Buskulic^a, D. Casper^a, I. De Bonis^a, D. Decamp^a, P. Ghez^a, C. Goy^a, J. -P. Lees^a, M. -N. Minard^a, P. Odier^a, B. Pietrzyk^a, F. Ariztizabal^b, M. Chmeissani^b, J. M. Crespo^b, I. Efthymiopoulos^b, E. Fernandez^b, M. Fernandez-Bosman^b, V. Gaitan^b, Ll. Garrido^b^,¹⁵, M. Martinez^b, S. Orteu^b, A. Pacheco^b, C. Padilla^b, F. Palla^b, A. Pascual^b, J. A. Perlas^b, F. Sanchez^b, F. Teubert^b, D. Creanza^c, M. de Palma^c, A. Farilla^c, M. Girone^c, G. Iaselli^c, G. Maggi^c^,³, N. Marinelli^c, S. Natali^c, S. Nuzzo^c, A. Ranieri^c, G. Raso^c, F. Romano^c, F. Ruggieri^c, G. Selvaggi^c, L. Silvestris^c, P. Tempesta^c, G. Zito^c, X. Huang^d, J. Lin^d, Q. Ouyang^d, T. Wang^d, Y. Xie^d, R. Xu^d, S. Xue^d, J. Zhang^d, L. Zhang^d, W. Zhao^d, G. Bonvicini^e, M. Cattaneo^e, P. Comas^e, P. Coyle^e, H. Drevermann^e, A. Engelhardt^e, R. W. Forty^e, M. Frank^e, R. Hagelberg^e, J. Harvey^e, R. Jacobsen^e^,²⁴, P. Janot^e, B. Jost^e, J. Knobloch^e, I. Lehraus^e, M. Maggi^e, C. Markou^e^,²³, E. 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Park^v, I. C. Park^v, M. -H. Schune^v, S. Simion^v, J. -J. Veillet^v, I. Videau^v, D. Abbaneo^w, P. Azzurri^w, G. Bagliesi^w, G. Batignani^w, C. Bozzi^w, G. Calderini^w, M. Carpinelli^w, M. A. Ciocci^w, V. Ciulli^w, R. Dell'Orso^w, R. Fantechi^w, I. Ferrante^w, L. Foà^w^,¹, F. Forti^w, A. Giassi^w, M. A. Giorgi^w, A. Gregorio^w, F. Ligabue^w, A. Lusiani^w, P. S. Marrocchesi^w, A. Messineo^w, G. Rizzo^w, G. Sanguinetti^w, A. Sciabà^w, P. Spagnolo^w, J. Steinberger^w, R. Tenchini^w, G. Tonelli^w^,²⁶, G. Triggiani^w, C. Vannini^w, P. G. Verdini^w, J. Walsh^w, A. P. Betteridge^x, G. A. Blair^x, L. M. Bryant^x, Y. Gao^x, M. G. Green^x, D. L. Johnson^x, T. Medcalf^x, Ll. M. Mir^x, J. A. Strong^x, V. Bertin^y, D. R. Botterill^y, R. W. Clifft^y, T. R. Edgecock^y, S. Haywood^y, M. Edwards^y, P. Maley^y, P. R. Norton^y, J. C. Thompson^y, B. Bloch-Devaux^z, P. Colas^z, H. Duarte^z, S. Emery^z, W. Kozanecki^z, E. Lançon^z, M. C. Lemaire^z, E. Locci^z, B. Marx^z, P. Perez^z, J. Rander^z, J. -F. Renardy^z, A. Rosowsky^z, A. Roussarie^z, J. -P. Schuller^z, J. Schwindling^z, D. Si Mohand^z, A. Trabelsi^z, B. Vallage^z, R. P. Johnson^aa, H. Y. Kim^aa, A. M. Litkie^aa, M. A. McNeil^aa, G. Taylor^aa, A. Beddall^ab, C. N. Booth^ab, R. Boswell^ab, S. Cartwright^ab, F. Combley^ab, I. Dawson^ab, A. Koksal^ab, M. Letho^ab, W. M. Newton^ab, C. Rankin^ab, L. F. Thompson^ab, A. Böhrer^ac, S. Brandt^ac, G. Cowan^ac, E. Feigl^ac, C. Grupen^ac, G. Lutters^ac, J. Minguet-Rodriguez^ac, F. Rivera^ac^,²⁵, P. Saraiva^ac, L. Smolik^ac, F. Stephan^ac, L. Bosisio^ad, R. Della Marina^ad, G. Ganis^ad, G. Giannini^ad, B. Gobbo^ad, L. Pitis^ad, F. Ragusa^ad^,²⁰, J. Rothberg^ae, S. Wasserbaech^ae, S. R. Armstrong^af, L. Bellantoni^af, P. Elmer^af, Z. Feng^af, D. P. S. Ferguson^af, Y. S. Gao^af, S. González^af, J. Grahl^af, J. L. Harton^af, O. J. Hayes^af, H. Hu^af, P. A. McNamara, III ^af, J. M. Nachtman^af, W. Orejudos^af, Y. B. Pan^af, Y. Saadi^af, M. Schmitt^af, I. J. Scott^af, V. Sharma^af, J. D. Turk^af, A. M. Walsh^af, F. V. Weber^af^,¹, Sau Lan Wu^af, X. Wu^af, J. M. Yamartino^af, M. Zheng^af and G. Zobernig^af

^a Laboratoire de Physique des Particules (LAPP), IN2P3-CNRS, 74019, Annecy-le-Vieux Cedex, France

Institut de Fisica d'Altes Energies, Universitat Autonoma de Barcelona, 08193 Bellaterra, Barcelona, Spain ⁷

^c Dipartimento di Fisica, INFN Sezione di Bari, 70126, Bari, Italy

Institute of High-Energy Physics, Academia Sinica, Beijing, People's Republic of China^,⁸

^e European Laboratory for Particle Physics (CERN), 1211, Geneva 23, Switzerland

^f Laboratoire de Physique Corpusculaire, Université Blaise Pascal, IN2P3-CNRS, Clermont-Ferrand, 63177, Aubière, France

Niels Bohr Institute, 2100, Copenhagen, Denmark^,⁹

^h Nuclear Research Center Demokritos (NRCD), Athens, Greece

ⁱ Laboratoire de Physique Nucléaire et des Hautes Energies, Ecole Polytechnique, IN2P3-CNRS, 91128, Palaiseau Cedex, France

Department of Physics, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom^,¹⁰

^k Dipartimento di Fisica, Università di Firenze, INFN Sezione di Firenze, 50125, Firenze, Italy

Supercomputer Computations Research Institute, Florida State University, Tallahassee, FL 32306-4052, USA^,¹³^,¹⁴

^m Laboratori Nazionali dell'INFN (LNF-INFN), 00044, Frascati, Italy

ⁿ Department of Physics and Astronomy, University of Glasgow, Glasgow G12 8 QQ, United Kingdom^,¹⁰

Institut für Hochenergiephysik, Universität Heidelberg, 69120, Heidelberg, Fed. Rep. Germany^,¹⁶

^p Department of Physics, Imperial College, London SW7 2BZ, United Kingdom^,¹⁰

Institut für Experimentalphysik, Universität Innsbruck, 6020, Innsbruck, Austria^,¹⁸

^r Department of Physics, University of Lancaster, Lancaster LA1 4YB, United Kingdom^,¹⁰

^s Institut für Physik, Universität Mainz, 55099, Mainz, Fed. Rep. Germany^,¹⁶

^t Centre de Physique des Particules, Faculté des Sciences de Luminy, IN2P3-CNRS, 13288, Marseille, France

^u Max-Planck-Institut für Physik, Werner-Heisenberg-Institut, 80805, München, Fed. Rep. Germany^,¹⁶

^v Laboratoire de l'Accélérateur Linéaire, Université de Paris-Sud, IN2P3-CNRS, 91405, Orsay Cedex, France

^w Dipartimento di Fisica dell'Università, INFN Sezione di Pisa, e Scuola Normale Superiore, 56010, Pisa, Italy

^x Department of Physics, Royal Holloway & Bedford New College, University of London, Surrey TW20 OEX, United Kingdom^,¹⁰

^y Particle Physics Dept., Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 OQX, United Kingdom^,¹⁰

CEA, DAPNIA/Service de Physique des Particules, CE-Saclay, 91191, Gif-sur-Yvette Cedex, France^,¹⁷

Institute for Particle Physics, University of California at Santa Cruz, Santa Cruz, CA 95064, USA^,²²

^ab Department of Physics, University of Sheffield, Sheffield S3 7RH, United Kingdom^,¹⁰

^ac Fachbereich Physik, Universität Siegen, 57068, Siegen, Fed. Rep. Germany^,¹⁶

^ad Dipartimento di Fisica, Università di Trieste e INFN Sezione di Trieste, 34127, Trieste, Italy

^ae Experimental Elementary Particle Physics, University of Washington, WA 98195 Seattle, USA

Department of Physics, University of Wisconsin, Madison, WI 53706, USA^,¹¹

Received 18 April 1995.

Editor: L. Montanet

Available online 23 February 2000.

Abstract

From 1.4 million hadronic Z decays collected by the ALEPH detector at LEP, an enriched sample of Z → c events is extracted by requiring the presence of a high momentum D^*±. The charm quark forward-backward charge asymmetry at the Z pole is measured to be A_FB^0.c = (8.0 ± 2.4) % corresponding to an effective electroweak mixing angle of sin²θ_W^eff = 0.2302 ± 0.0054.