Inclusive photon production in pA and AA collisions at 200 GeV/u

T P A Åkesson ,S Muraviev,E Mazzucato,S Almehed,M Seman,D Lissauer,I Blevis,M Sekimoto,B Collick,V Bisi,F Gibrat-Debu,S Dagan,G Vasseur,H J Specht,K Dederichs,L Riccati,H Beker,N A Mccubbin,I Tserruya,Z Fraenkel,H Atherton,A Drees,R Veenhoff,D Bettoni,M A Mazzoni,L A Hamel,N Armenise,V Sidoroy,B Lörstad,B Erlandsson,G Romano,F Lamarche,M Clemen,J P Pansart,H Bøggild,P Yepes,V Toherniatin,M T Muciaccia,I Stumer,M Masera,F Martelli,S Simone,J M Beaulieu,H Sletten,B Dogolshein,R Heifetz,F Piuz,P Depommier,A Gaidot,S Dell'Uomo,G.w London ,P L Mcgaughey ,G Poulard ,F Corriveau ,G Rosa ,U Mjörnmark ,C Fabjan ,M.j Esten ,V Hedberg ,S Yu Smirnov ,A Lounis ,M Murray ,S Johansson ,L Olsen ,L Ramello ,S Di Liberto ,O Benary ,Hans Henrik Thodberg ,A Pfeiffer ,A Shmeleva ,V Polychronakos ,V Kroth ,Y Oren ,J Dodd ,B Jacak ,W E Sondheim ,R Wigmans ,H W Bartels ,V O Tikhomirov ,A Marzari‐Chiesa ,C Leroy ,B Selldén ,J W Sunier ,P Fischer ,H En’yo ,G Jarlskog ,Y Sirois ,S Nilsson ,Y M Park ,P Glässel ,P Giubellino ,A.l.s Angelis ,P Aubry ,J Schukraft ,Matthias Neubert ,L Šándor ,G Beaudoin ,D Rahm ,M Mccubbin ,H.w Kraner ,H Van Hecke ,N.j Digiacomo ,W Cleland ,U Goerlach ,A Hölscher ,J Soltani ,Richard F Haglund ,J Thompson ,Michael Price ,F Meddi ,R.c.e Devenish

doi:10.1007/bf01621024

Abstract

Inclusive photonp⊥ spectra were measured with 200 GeV/u proton,16O and32S beams on W and Pt targets, using a conversion method. The measurement of charged pions in the same apparatus allows a comparison of the γ data with the expected γ's from hadronic decays π0, η, η', ω). In all data sets, no deviation from the expected shape is observed in the range of 0.1 0.1 GeV/c andp⊥>0.6 GeV/c.

Full Text