Properties Of Photon Plus Two-Jet Events In (P)Over-Bar-P Collisions At Root S=1.8 Tev

F. Abe,H. Akimoto, A. Akopian, M. G. Albrow,S. R. Amendolia, D. Amidei, J. Antos,S. Aota, G. Apollinari,T. Asakawa,W. Ashmanskas,M. Atac, F. Azfar,P. Azzi-Bacchetta,N. Bacchetta,W. Badgett, S. Bagdasarov,M. W. Bailey,J. Bao,P. de Barbaro, A. Barbaro-Galtieri, V. E. Barnes,B. A. Barnett,M. Barone, E. Barzi, G. Bauer,T. Baumann,F. Bedeschi, S. Behrends, S. Belforte, G. Bellettini, J. Bellinger,D. Benjamin,J. Benlloch,J. Bensinger,D. Benton,A. Beretvas,J. P. Berge, J. Berryhill,S. Bertolucci,B. Bevensee, A. Bhatti,K. Biery,M. Binkley, D. Bisello,R. E. Blair,C. Blocker,A. Bodek,W. Bokhari,V. Bolognesi, G. Bolla, D. Bortoletto,J. Boudreau,L. Breccia,C. Bromberg,N. Bruner,E. Buckley-Geer,H. S. Budd, K. Burkett,G. Busetto,A. Byon-Wagner, K. L. Byrum,J. Cammerata,C. Campagnari, M. Campbell,A. Caner,W. Carithers, D. Carlsmith,A. Castro, D. Cauz,Y. Cen,F. Cervelli,P. S. Chang,P. T. Chang,H. Y. Chao,J. Chapman,M.-T. Cheng,G. Chiarelli,T. Chikamatsu, C. N. Chiou,L. Christofek, S. Cihangir,A. G. 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Wicklund, E. Wicklund,R. Wilkinson,H. H. Williams,P. Wilson,B. L. Winer, D. Winn,D. Wolinski,J. Wolinski,S. Worm,X. Wu,J. Wyss,A. Yagil, W. Yao,K. Yasuoka,Y. Ye,G. P. Yeh,P. Yeh,M. Yin, J. Yoh,C. Yosef,T. Yoshida,D. Yovanovitch, I. Yu,L. Yu, J. C. Yun, A. Zanetti,F. Zetti, L. Zhang,W. Zhang,S. Zucchelli

PHYSICAL REVIEW D（1998）

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摘要

We present the first general measurements (invariant-mass, transverse-energy, and angular distributions) of the process, (p) over bar p-->gamma+2 jets + X, using data collected by the CDF at Fermilab. We compare the data with predictions from a tree-level QCD calculation and the PYTHIA shower Monte Carlo program. Our data sample is particularly sensitive to contributions from initial-and final-state radiation of photons and jets. Using the PYTHIA Monte Carlo program, we contrast the kinematical distributions for direct photon production with those for initial-and final-state photon radiation (bremsstrahlung). Based on the angular distributions, we find that our data favor a mixture of bremsstrahlung and direct photon production, as predicted, over either process alone. [S0556-2821(97)01623-8].

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cross section,proton,distributions

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