6533b7d9fe1ef96bd126ca31
RESEARCH PRODUCT
Study of prompt photon production in hadronic Z° decays.
Delphi CollaborationMaría Victoria Castillo GiménezAntonio Ferrer SoriaEmilio Higón RodríguezJ. T. M. ChrinEduardo Cortina GilAntonio Ferrer SoriaJuan A. Fuster VerdúCarmen García GarcíaJuan José Gómez CadenasJuan José Hernández ReyJosé ÁNgel Hernando MorataCarlos Lacasta LlácerFernando Martínez VidalSalvador Martí GarcíaSergio Navas ConchaJosé Salt CairolsJuan Antonio Valls FerrerJosé Julio Lozano Bahilosubject
Col·lisions (Física nuclear)Física nuclearPartícules (Física nuclear)description
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 nal state photons is measured and is compared with the O( ; s) 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+0:25 0:36 and c1=3 = 1:62+0:24 0:17 are compatible with the Standard Model prediction, c2=3 = 1:145 and c1=3 = 1:477.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1995-01-01 |