ScienceDirect - Physics Letters B : A measurement of |Vcb| from

Physics Letters B
Volume 359, Issues 1-2, 5 October 1995, Pages 236-248

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doi:10.1016/0370-2693(95)01021-H

A measurement of |V_cb| from

ALEPH Collaboration, D. Buskulic^a, D. Casper^a, I. De Bonis^a, D. Decamp^a, P. Ghez^a, C. Goy^a, J. -P. Lees^a, A. Lucotte^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, A. Colaleo^c, D. Creanza^c, M. de Palma^c, A. Farilla^c, G. Gelao^c, M. Girone^c, G. Iaselli^c, G. Maggi^c^,³, M. Maggi^c, 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, D. G. Cassel^e^,²⁷, 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, C. Markou^e^,²³, E. B. Martin^e, P. Mato^e, H. Meinhard^e, A. Minten^e, R. Miquel^e, K. Moffeit^e^,²⁸, T. Oest^e, P. Palazzi^e, J. R. Pater^e^,²⁹, J. -F. Pusztaszeri^e, F. Ranjard^e, P. Rensing^e, L. Rolandi^e, D. Schlatter^e, M. Schmelling^e, O. Schneider^e, W. Tejessy^e, I. R. Tomalin^e, A. Venturi^e, H. Wachsmuth^e, W. Wiedenmann^e, T. Wildish^e, W. Witzeling^e, J. Wotschack^e, Z. Ajaltouni^f, M. Bardadin-Otwinowska^f^,², A. Barres^f, C. Boyer^f, A. Falvard^f, P. Gay^f, C. Guicheney^f, P. Henrard^f, J. Jousset^f, B. Michel^f, S. Monteil^f, J-C. Montret^f, D. Pallin^f, P. Perret^f, F. Podlyski^f, J. Proriol^f, J. -M. Rossignol^f, F. Saadi^f, T. Fearnley^g, J. B. Hansen^g, J. D. Hansen^g, J. R. Hansen^g, P. H. Hansen^g, B. S. Nilsson^g, A. Kyriakis^h, E. Simopoulou^h, I. Siotis^h, A. Vayaki^h, K. Zachariadou^h, A. Blondelⁱ^,²¹, G. Bonneaudⁱ, J. C. Brientⁱ, P. Bourdonⁱ, L. Passalacquaⁱ, A. Rougéⁱ, M. Rumpfⁱ, R. Tanakaⁱ, A. Valassiⁱ^,³³, M. Verderiⁱ, H. Videauⁱ, D. J. Candlin^j, M. I. Parsons^j, E. Focardi^k, G. Parrini^k, M. Corden^l, M. Delfino^l^,¹², C. Georgiopoulos^l, D. E. Jaffe^l, A. Antonelli^m, G. Bencivenni^m, G. Bologna^m^,⁴, F. Bossi^m, P. Campana^m, G. Capon^m, V. Chiarella^m, G. Felici^m, P. Laurelli^m, G. Mannocchi^m^,⁵, F. Murtas^m, G. P. Murtas^m, M. Pepe-Altarelli^m, S. J. Dorrisⁿ, A. W. Halleyⁿ, I. ten Haveⁿ^,⁶, I. G. Knowlesⁿ, J. G. Lynchⁿ, W. T. Mortonⁿ, V. O'Sheaⁿ, C. Raineⁿ, P. Reevesⁿ, J. M. Scarrⁿ, K. Smithⁿ, M. G. Smithⁿ, A. S. Thompsonⁿ, F. Thomsonⁿ, S. Thornⁿ, R. M. Turnbullⁿ, U. Becker^o, O. Braun^o, C. Geweniger^o, G. Graefe^o, P. Hanke^o, V. Hepp^o, E. E. Kluge^o, A. Putzer^o, B. Rensch^o, M. Schmidt^o, J. Sommer^o, H. Stenzel^o, K. Tittel^o, S. Werner^o, M. Wunsch^o, R. Beuselinck^p, D. M. Binnie^p, W. Cameron^p, D. J. Colling^p, P. J. Dornan^p, N. Konstantinidis^p, L. Moneta^p, A. Moutoussi^p, J. Nash^p, G. San Martin^p, J. K. Sedgbeer^p, A. M. Stacey^p, G. 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Harton^af^,³⁰, 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^,³¹, J. D. Turk^af, A. M. Walsh^af, 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 8QQ, United Kingdom^,¹⁰ Institut für Hochenergiephysik, Universität Heidelberg, 69120, Heidelberg, 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, 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, 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 O

X, 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, 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 30 June 1995.

Editor: K. Winter

Available online 15 November 2000.

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Abstract

From approximately 3 million hadronic decays of Z bosons recorded with the detector at , a sample of 410 ± 32 candidates is selected, where ℓ is either an electron or a muon. The differential decay rate from this sample is fitted, yielding a value for the product of the CKM matrix element |V_cb| and the normalisation of the decay form factor at the point of zero recoil of the D^*+ meson (ω = 1)|V_cb| = (31.4 ± 2.3_stat ± 2.5_syst) × 10⁻³. A value for |V_cb| is extracted using theoretical calculations of the form factor normalisation, with the result |V_cb| = (34.5 ± 2.5_stat ± 2.7_syst ± 1.5_theory) × 10⁻³. From the integrated s the measured branching fraction is