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- --> l <nu q(q)over bar>. The branching fraction of hadronic W decays to a final state containing a c quark, R-c(W) = 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).

A direct measurement of |Vcs| in hadronic W decays using a charm tag / 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., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 465:1-4(1999), pp. 349-362. [10.1016/S0370-2693(99)01088-6]

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

CREANZA, Donato Maria;IASELLI, Giuseppe;MAGGI, Giorgio Pietro;
1999

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(-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- --> l . The branching fraction of hadronic W decays to a final state containing a c quark, R-c(W) = 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).
1999
A direct measurement of |Vcs| in hadronic W decays using a charm tag / 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., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 465:1-4(1999), pp. 349-362. [10.1016/S0370-2693(99)01088-6]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/2896
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