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 sigma(WW) = 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: m(W) = 80.14 +/- 0.34(stat.) +/- 0.09(syst.) +/- 0.03(LEP energy) GeV/c(2).

R., B., D., B., D., D., P., G., C., G., J. P., L., et al. (1997). Measurement of the W mass in e(+)e(-) collisions at production threshold. PHYSICS LETTERS. SECTION B, 401(3-4), 347-362 [10.1016/S0370-2693(97)00460-7].

Measurement of the W mass in e(+)e(-) collisions at production threshold

CIOCCI, MARIA AGNESE;MARROCCHESI, PIER SIMONE;
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 sigma(WW) = 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: m(W) = 80.14 +/- 0.34(stat.) +/- 0.09(syst.) +/- 0.03(LEP energy) GeV/c(2).
1997
R., B., D., B., D., D., P., G., C., G., J. P., L., et al. (1997). Measurement of the W mass in e(+)e(-) collisions at production threshold. PHYSICS LETTERS. SECTION B, 401(3-4), 347-362 [10.1016/S0370-2693(97)00460-7].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/38381
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