A direct measurement of |Vcs| in hadronic W decays using a charm tag

R. Barate, D. Decamp, P. Ghez, C. Goy, S. Jezequel, J. P. Lees, F. Martin, E. Merle, M. N. Minard, B. Pietrzyk, R. Alemany, S. Bravo, M. P. Casado, M. Chmeissani, J. M. Crespo, E. Fernandez, M. Fernandez-Bosman, Ll Garrido, E. Graugès, A. JusteM. Martinez, G. Merino, R. Miquel, Ll M. Mir, P. Morawitz, A. Pacheco, I. Riu, 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, J. Lin, Q. Ouyang, T. Wang, Y. Xie, R. Xu, S. Xue, J. Zhang, L. Zhang, W. Zhao, D. Abbaneo, U. Becker, G. Boix, O. Buchmüller, M. Cattaneo, F. Cerutti, V. Ciulli, G. Dissertori, H. Drevermann, R. W. Forty, M. Frank, F. Gianotti, T. C. Greening, A. W. Halley, J. B. Hansen, J. Harvey, P. Janot, B. Jost, I. Lehraus, O. Leroy, P. Maley, 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, Z. Ajaltouni, F. Badaud, G. Chazelle, O. Deschamps, S. Dessagne, A. Falvard, C. Ferdi, P. Gay, C. Guicheney, P. Henrard, J. Jousset, B. Michel, S. Monteil

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Abstract

The inclusive charm production rate in W decays is measured from a study of the properties of final state particles. The sample of W pairs is selected from 67.7 pb-1collected by ALEPH in 1996 and 1997 at centre-of-mass energies near 172 and 183 GeV in the channels W+W-→ 4q and W+W-→ℓvqq̄. The branching fraction of hadronic W decays to a final state containing a c quark, RcW= Γ(W→cX)/Γ(W→hadrons), is measured to be 0.51 ± 0.05stat+ 0.03syst.This allows a direct determination of the CKM matrix element |Vcs| = 1.00 ± 0.11stat± 0.07syst. © 1999 Published by Elsevier Science B.V. All rights reserved.
Original languageEnglish
Pages (from-to)349-362
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume465
Issue number1-4
DOIs
Publication statusPublished - 1 Jan 1999

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