In June 1996, the LEP centre-of-mass energy was raised to 161 GeV. Pair production of W bosons in e+e- collisions was observed for the first time by the LEP experiments. An integrated luminosity of 11 pb-1 was recorded in the ALEPH detector, in which WW candidate events were observed. In 6 events both Ws decay leptonically. In 16 events, one W decays leptonically, the other into hadrons. In the channel where both Ws decay into hadrons, a signal was separated from the large background by means of several multi-variate analyses. The W pair cross-section is measured to be σww = 4.23 +/- 0.73 (stat.) +/- 0.19 (syst.) pb. From this cross-section, the W mass is derived within the framework of the Standard Model: mw = 80.14 +/- 0.34 (stat.) +/- 0.09 (syst.) +/- 0.03 (LEP energy) GeV/c2

Measurement of the W mass in e+e− collisions at production threshold / R., B., D., B., D., D., P., G., C., G., J. P., L., A., L., M. N., M., J. Y., N., B., P., M. P., C., M., C., P., C., J. M., C., M., D., E., F., M., F.B., Garrido, L.l., A., J., M., M., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 401:(1997), pp. 347-362. [10.1016/S0370-2693(97)00460-7]

Measurement of the W mass in e+e− collisions at production threshold

GREGORIO, ANNA;BOSISIO, LUCIANO;GIANNINI, GIANROSSANO;
1997-01-01

Abstract

In June 1996, the LEP centre-of-mass energy was raised to 161 GeV. Pair production of W bosons in e+e- collisions was observed for the first time by the LEP experiments. An integrated luminosity of 11 pb-1 was recorded in the ALEPH detector, in which WW candidate events were observed. In 6 events both Ws decay leptonically. In 16 events, one W decays leptonically, the other into hadrons. In the channel where both Ws decay into hadrons, a signal was separated from the large background by means of several multi-variate analyses. The W pair cross-section is measured to be σww = 4.23 +/- 0.73 (stat.) +/- 0.19 (syst.) pb. From this cross-section, the W mass is derived within the framework of the Standard Model: mw = 80.14 +/- 0.34 (stat.) +/- 0.09 (syst.) +/- 0.03 (LEP energy) GeV/c2
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2563023
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