Direct-photon plus away-side jet production in pp collisions at $$\sqrt s = 63$$ GeV and a determination of the gluon distribution

The Axial Field Spectrometer Collaboration,T. Åkesson,M. G. Albrow, S. Almehed,E. Anassontzis,R. Batley, O. Benary,H. Bøggild,O. Botner, H. Breuker,V. Burkert,B. Callen,R. Carosi, A. A. Carter,J. R. Carter,P. C. Cecil,V. Chernyatin,Y. Choi,W. E. Cleland, S. Dagan,E. Dahl-Jensen,I. Dahl-Jensen,P. Dam, G. Damgaard,B. Dolgoshein,S. Eidelman, M. W. Evans,C. W. Fabjan, I. Gavrilenko, U. Goerlach, Y. Goloubkov,H. Gordon,K. H. Hansen, V. Hedberg,J. W. Hiddleston,P. Ioannou, G. Jarlskog,T. Jensen,A. Kalinovsky,V. Kantserov,S. Katsanevas,C. Kourkoumelis,R. Kroeger, K. Kulka, D. Lissauer, B. Lörstad, I. Mannelli,A. Markou,S. Mayburov, N. A. McCubbin,U. Mjörnmark,R. Møller,W. Molzon, P. Nevsky, B. S. Nielsen,L. H. Olsen, Y. Oren, G. Piskounov, D. C. Rahm,L. K. Resvanis,A. Rudge,J. Schukraft,A. Shmeleva,V. Sidorov,S. Smirnov,H. Specht,N. Starinsky, I. Stumer,M. Sullivan,H. H. Thodberg,J. A. Thompson,G. Thorstenson, A. Vanjashin,E. Vella,J. Williamson,W. J. Willis,M. Winik,C. Woody

European Physical Journal C（1987）

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摘要

We have determined the double inclusive cross-section for opposite-side high-p T photons and away-side jets withθ γ ≈θjet≈90° produced inpp collisions at the CERN Intersecting Storage Rings at$\sqrt s = 63$ GeV. Under the assumption that these events arise predominantly from the QCD gluon Compton process we have calculated the gluon structure function in the range 0.15≦x≦0.30 at an average square of the four-momentum transfer of 40 GeV2/c2. The data favour a soft gluon distribution in the proton.

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关键词

Field Theory,Elementary Particle,Quantum Field Theory,Structure Function,Particle Acceleration

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