A direct measurement of $\mid V_{cs} \mid$ in hadronic W decays using a charm tag

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-1 collected 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- -->lvqq....

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Published in:Physics letters. B 1999, Vol.465, p.349-362
Main Authors: Barate, R., Decamp, D., Ghez, P., Goy, C., Jezequel, S., Lees, J P., Martin, F., Merle, E., Minard, M N., Pietrzyk, B., Alemany, R., Bravo, S., Casado, M P., Chmeissani, M., Crespo, J M., Fernandez, E., Fernandez-Bosman, M., Garrido, L., Grauges, E., Juste, A., Martinez, M., Merino, G., Miquel, R., Mir, L M., Morawitz, P., Pacheco, A., Riu, I., Ruiz, H., Colaleo, A., Creanza, D., de Palma, M., Iaselli, G., Maggi, G., Maggi, M., Nuzzo, S., Ranieri, A., Raso, G., Ruggieri, F., Selvaggi, G., Silvestris, L., Tempesta, P., Tricomi, A., Zito, G., Huang, X., Lin, Jiali, Ouyang, Q., Wang, T., Xie, Y., Xu, R., Xue, S., Zhang, J., Zhang, L., Zhao, W., Abbaneo, D., Becker, U., Boix, G., Buchmuller, O., Cattaneo, M., Cerutti, F., Ciulli, V., Dissertori, G., Drevermann, H., Forty, R W., Frank, M., Gianotti, F., Greening, T C., Halley, a W., Hansen, J B., Harvey, J., Janot, P., Jost, B., Lehraus, I., Leroy, O., Maley, P., Mato, P., Minten, A., Moutoussi, A., Ranjard, F., Rolandi, L., Schlatter, D., Schmitt, M., Schneider, O., Spagnolo, P., Tejessy, W., Teubert, F., Tournefier, E., Wright, a E., Ajaltouni, Ziad Zj, Badaud, F., Chazelle, G., Deschamps, O., Dessagne, S., Falvard, Alain, Ferdi, C., Gay, Pascal, Guicheney, C., Henrard, Pierre, Jousset, J., Michel, B., Monteil, S.
Format: Article
Language:English
Subjects:
High Energy Physics - Experiment
Physics
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Summary: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-1 collected 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- -->lvqq. The branching fraction of hadronic W decays to a final state containing a c quark, R^W_c=Gamma(W-->cX)/Gamma(W-->hadrons), is measured to be 0.51 +- 0.05_stat +- 0.03_syst. This allows a direct determination of the CKM matrix element |V_cs| = 1.00 +- 0.11_stat +- 0.07_syst.
ISSN:0370-2693