The production of c and b quarks gamma gamma collisions is studied with the L3 detector at LEP with 410 pb(-1) of data, collected at centre-of-mass energies from 189 GeV to 202 GeV. Hadronic final states containing c and b quarks are identified by detecting electrons or muons from their semileptonic decays. The cross sections sigma (e(+)e(-) --> e(+)e(-)c (c) over barX) and sigma (e(+)e(-) --> e(+)e(-)b (b) over barX) are measured and compared to next-to-leading order perturbative QCD calculations. The cross section of b production is measured in gamma gamma collisions for the first time. It is in excess of the QCD prediction by a factor of three. (C) 2001 Published by Elsevier Science B.V.

Measurements of the cross sections for open chasm and beauty production in gamma gamma collisions at root s=189-202 GeV / M. Acciarri, P. Achard, O. Adriani, M. Aguilar-Benitez, J. Alcaraz, G. Alemanni, J. Allaby, A. Aloisio, M. G. Alviggi, G. Ambrosi, H. Anderhub, V. P. Andreev, T. Angelescu, F. Anselmo, A. Arefiev, T. Azemoon, T. Aziz, P. Bagnaia, A. Bajo, L. Baksay, et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - ELETTRONICO. - 503:(2001), pp. 10-20. [10.1016/S0370-2693(01)00134-4]

Measurements of the cross sections for open chasm and beauty production in gamma gamma collisions at root s=189-202 GeV

ADRIANI, OSCAR;BECATTINI, FRANCESCO;D'ALESSANDRO, RAFFAELLO;
2001

Abstract

The production of c and b quarks gamma gamma collisions is studied with the L3 detector at LEP with 410 pb(-1) of data, collected at centre-of-mass energies from 189 GeV to 202 GeV. Hadronic final states containing c and b quarks are identified by detecting electrons or muons from their semileptonic decays. The cross sections sigma (e(+)e(-) --> e(+)e(-)c (c) over barX) and sigma (e(+)e(-) --> e(+)e(-)b (b) over barX) are measured and compared to next-to-leading order perturbative QCD calculations. The cross section of b production is measured in gamma gamma collisions for the first time. It is in excess of the QCD prediction by a factor of three. (C) 2001 Published by Elsevier Science B.V.
2001
503
10
20
M. Acciarri;P. Achard;O. Adriani;M. Aguilar-Benitez;J. Alcaraz;G. Alemanni;J. Allaby;A. Aloisio;M. G. Alviggi;G. Ambrosi;H. Anderhub;V. P. ...espandi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/774959
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