Measurement of isolated photon production in hadronic Z decays

D Decamp; B Deschizeaux; C Goy; JP Lees; MN Minard; R Alemany; JM Crespo; M Delfino; E Fernandez; V Gaitan; L Garrido; LM Mir; A Pacheco; MG Catanesi; D Creanza; M de Palma; A Farilla; G Iaselli; G Maggi; M Maggi; S Natali; S Nuzzo; M Quattromini; A Ranieri; G Raso; F Romano; F Ruggieri; G Selvaggi; L Silvestris; P Tempesta; G Zito; Y Gao; H Hu; D Huang; X Huang; J Lin; J Lou; C Qiao; T Ruan; T Wang; Y Xie; D Xu; R Xu; J Zhang; W Zhao; WB Atwood; LAT Bauerdick; F Bird; E Blucher; G Bonvicini; F Bossi; J Boudreau; D Brown; TH Burnett; H Drevermann; RW Forty; C Grab; R Hagelberg; S Haywood; J Hilgart; B Jost; M Kasemann; J Knobloch; A Lacourt; E Lançon; I Lehraus; T Lohse; A Lusiani; A Marchioro; M Martinez; P Mato; S Menary; A Minten; A Miotto; R Miquel; HG Moser; J Nash; P Palazzi; F Ranjard; G Redlinger; A Roth; J Rothberg; H Rotsheidt; M Saich; R St.Denis; D Schlatter; M Takashima; M Talby; W Tejessy; H Wachsmuth; S Wasserbaech; S Wheeler; W Wiedenmann; W Witzeling; J Wotschack; Z Ajaltouni; M Bardadin-Otwinowska; R El Fellous; A Falvard; P Gay

Journal article

Measurement of isolated photon production in hadronic Z decays

D Decamp, B Deschizeaux, C Goy, JP Lees, MN Minard, R Alemany, JM Crespo, M Delfino, E Fernandez, V Gaitan, L Garrido, LM Mir, A Pacheco, MG Catanesi, D Creanza, M de Palma, A Farilla, G Iaselli, G Maggi, M Maggi Show all

Physics Letters B | ELSEVIER SCIENCE BV | Published : 1991

DOI: 10.1016/0370-2693(91)90380-9

Abstract

The production of high energy isolated photons in hadronic Z decays is measured with the ALEPH detector at LEP using a sample of 180 000 hadronic events. Such photons are mainly radiated by quarks, thus giving direct insights into the early parton showering mechanism. The observed rate is compared with a QCD calculation of final state radiation from quarks. © 1991.