Measurement Of The Gluon Structure-Function From Direct Photon Data At The Cern (P)Over-Bar-P Collider

J Alitti,G Ambrosini,Reza Ansari,D Autiero,P Bareyre,I Bertram,G Blaylock,P Bonamy,K Borer,M Bourliaud,D Buskulic,G Carboni,D Cavalli,V Cavasinni,P Cenci,J C Chollet,C Conta, Gary S Da Costa,F Costantini,L Cozzi,A Cravero,M Curatolo,Andrea Dellacqua,T Delprete,R S Dewolf,L Dilella,Y Ducros,Gary F Egan,K Einsweiler,B Esposito,L Fayard,A Federspiel,R Ferrari,M Fraternali,D Froidevaux,G Fumagalli,J M Gaillard,F Gianotti,O Gildemeister,C Gossling,V G Goggi,S Grunendahl,K Hara,Sten Hellman,J Hrivnac,H Hufnagel,E Hugentobler,K Hultqvist,E Iacopini,J Incandela,K Jacobs,P Jenni,E E Kluge,N Kurz,S Lami,P Lariccia,Mario Lefebvre,L Linssen,M Livan,P Lubrano,C Magneville,L Malgeri,L Mandelli,L Mapelli,M Mazzanti,Karlheinz Meier,B Merkel,J Meyer,M Moniez,R Moning,M Morganti,L Muller,D J Munday,M Nessi,F Nessitedaldi,C Onions,T Pal,M A Parker,G Parrour,F Pastore,E Pennacchio,J M Pentney,M Pepe,L Perini,C Petridou,P Petroff,H Plothowbesch,G Polesello,A Poppleton,K Pretzl,M Primavera,M Punturo,J P Repellin,A Rimoldi,Maria Carmela Sacchi,P Scampoli,J Schacher,B Schmidt,V Simak,S L Singh,V Sondermann,R Spiwoks,S Stapnes,C Talamonti,F Tondini,S N Tovey,E Tsesmelis,G Unal,M Valdatanappi,Valerio Vercesi,A R Weidberg,P S Wells,T O White,D R Wood,S A Wotton,H Zaccone,A Zylberstejn

PHYSICS LETTERS B（1993）

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摘要

A measurement of the gluon structure fusion using direct photon events observed with the UA2 detector in ppBAR collisions at square-root s = 630 GeV is presented. The x-range covered by this analysis is between 0.049 and 0.207 and the Q2 range is between 280 GeV2 and 3670 GeV2. The data sample corresponds to an integrated luminosity of 7.14 pb-1. The results are found to be in good agreement with the gluon distributions measured in deep inelastic scattering experiments extrapolated to the UA2 Q2 values.

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关键词

gluon structure function,direct photon data

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