par Abreu, Pedro;Bertrand, Daniel ;Bricman, Claude ;Lefebure, Véronique ;Wickens, John H. ; [et al.]
Référence Zeitschrift für Physik. C, Particles and fields, 69, 1, page (1-13)
Publication Publié, 1995
Article révisé par les pairs
Résumé : From a sample of 1.5 million Z0→qq decays collected by the DELPHI detector during 1991, 1992 and 1993, the production cross section for isolated final state photons is measured and is compared with the O(α, αs) matrix element calculations implemented in the EEPRAD and GNJETS Monte Carlo generators. The observed photon yield is used to derive the electroweak couplings of charge 2/3 (u-type) and charge 1/3 (d-type) quarks to the Z0 boson. The measured values c2/3=0.91-0.36 +0.25 and c1/3=1.62-0.17 +0.24 are compatible with the Standard Model prediction, c2/3=1.145 and c1/3=1.477. © 1996 Springer-Verlag.