The production of W+W- pairs is analysed in a data sample collected by ALEPH at a mean centre-of-mass energy of 188.6 GeV, corresponding to an integrated luminosity of 174.2 pb(-1). Cross sections are given for different topologies of W decays into leptons or hadrons. Combining all final states and assuming Standard Model branching fractions, the total W-pail cross section is measured to be 15.71 +/- 0.34(stat.) +/- 0.18(syst.) pb. Using also the W-pair data samples collected by ALEPH at lower centre-of-mass energies, the decay branching fraction of the W boson into hadrons is measured to be B(W --> hadrons) = 66.97 +/- 0.65(stat.) +/- 0.32(syst.)%, allowing a determination of the CKM matrix element /V-cs/ = 0.951 +/- 0.030(stat,) +/- 0.015(syst.). (C) 2000 Elsevier Science B.V. All rights reserved.

Measurement of W-pair production in e(+)e(-) collisions at 189 GeV / Barate, R., Decamp, D., Ghez, P., Goy, C., Jezequal, 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., Martinez, M., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 484:3-4(2000), pp. 205-217. [10.1016/S0370-2693(00)00624-9]

Measurement of W-pair production in e(+)e(-) collisions at 189 GeV

CREANZA, Donato Maria;IASELLI, Giuseppe;MAGGI, Giorgio Pietro;
2000

Abstract

The production of W+W- pairs is analysed in a data sample collected by ALEPH at a mean centre-of-mass energy of 188.6 GeV, corresponding to an integrated luminosity of 174.2 pb(-1). Cross sections are given for different topologies of W decays into leptons or hadrons. Combining all final states and assuming Standard Model branching fractions, the total W-pail cross section is measured to be 15.71 +/- 0.34(stat.) +/- 0.18(syst.) pb. Using also the W-pair data samples collected by ALEPH at lower centre-of-mass energies, the decay branching fraction of the W boson into hadrons is measured to be B(W --> hadrons) = 66.97 +/- 0.65(stat.) +/- 0.32(syst.)%, allowing a determination of the CKM matrix element /V-cs/ = 0.951 +/- 0.030(stat,) +/- 0.015(syst.). (C) 2000 Elsevier Science B.V. All rights reserved.
2000
Measurement of W-pair production in e(+)e(-) collisions at 189 GeV / Barate, R., Decamp, D., Ghez, P., Goy, C., Jezequal, 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., Martinez, M., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 484:3-4(2000), pp. 205-217. [10.1016/S0370-2693(00)00624-9]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/3999
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