Using a data sample of 1475000 Z --> q (q) over bar(gamma) events collected during 1993 with the L3 detector at LEP, we have studied the purely leptonic decays of heavy flavour mesons, D-s(-) --> tau(-)(v) over bar(tau) and B- --> tau(-)(v) over bar(tau). A signal is observed in the invariant mass distribution M(gamma D-s(-)) corresponding to the decay sequence D-s(*-) --> gamma D-s(-), D-s(-) --> tau(-)(v) over bar(tau), tau(-)(v) over bar(tau), tau(-) --> l(-)(v) over bar(l)v(tau). The branching fraction for D-s(-) tau(-) (v) over bar(tau) decays is measured to be B(D-s(-) --> tau(-)(v) over bar(tau)) = 0.074 +/- 0.028(stat) +/- 0.016(syst) +/- 0.018(norm). No signal of B- --> tau-(v) over bar(tau) decays is observed in the data, corresponding to an upper limit on the branching fraction B(B- --> tau(-)(v) over bar(tau)) < 5.7 x 10(-4) at 90% CL. (C) 1997 Elsevier Science B.V.

Measurement of D-s(-)->tau(-)(nu)over-bar(tau) and a new limit for B-->tau(-)(nu)over-bar(tau center dot) / M., A., O., A., M., A., S., A., B., A., J., A., G., A., J., A., A., A., G., A., M. G., A., G., A., H., A., V. P., A., T., A., F., A., D., A., A., A., T., A., T., A., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 396:(1997), pp. 327-337. [10.1016/S0370-2693(97)00138-X]

Measurement of D-s(-)->tau(-)(nu)over-bar(tau) and a new limit for B-->tau(-)(nu)over-bar(tau center dot)

BAGNAIA, Paolo;FACCINI, Riccardo;FERRONI, Fernando;GENTILE, Simonetta;GIAGU, Stefano;ORGANTINI, Giovanni;
1997

Abstract

Using a data sample of 1475000 Z --> q (q) over bar(gamma) events collected during 1993 with the L3 detector at LEP, we have studied the purely leptonic decays of heavy flavour mesons, D-s(-) --> tau(-)(v) over bar(tau) and B- --> tau(-)(v) over bar(tau). A signal is observed in the invariant mass distribution M(gamma D-s(-)) corresponding to the decay sequence D-s(*-) --> gamma D-s(-), D-s(-) --> tau(-)(v) over bar(tau), tau(-)(v) over bar(tau), tau(-) --> l(-)(v) over bar(l)v(tau). The branching fraction for D-s(-) tau(-) (v) over bar(tau) decays is measured to be B(D-s(-) --> tau(-)(v) over bar(tau)) = 0.074 +/- 0.028(stat) +/- 0.016(syst) +/- 0.018(norm). No signal of B- --> tau-(v) over bar(tau) decays is observed in the data, corresponding to an upper limit on the branching fraction B(B- --> tau(-)(v) over bar(tau)) < 5.7 x 10(-4) at 90% CL. (C) 1997 Elsevier Science B.V.
1997
01 Pubblicazione su rivista::01a Articolo in rivista
Measurement of D-s(-)-&gt;tau(-)(nu)over-bar(tau) and a new limit for B--&gt;tau(-)(nu)over-bar(tau center dot) / M., A., O., A., M., A., S., A., B., A., J., A., G., A., J., A., A., A., G., A., M. G., A., G., A., H., A., V. P., A., T., A., F., A., D., A., A., A., T., A., T., A., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 396:(1997), pp. 327-337. [10.1016/S0370-2693(97)00138-X]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/472615
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