Measurement of the cross section for prompt isolated diphoton production in pp̄ collisions at s=1.96TeV

T. Aaltonen,B. Álvarez González, S. Amerio, D. Amidei, A. Anastassov,Alberto Annovi, J. Antos,Giorgio Apollinari, J. A. Appel, A. Apresyan,Tetsuo Arisawa, A. Artikov, J. Asaadi, W. Ashmanskas, B. Auerbach,A. Aurisano, F. Azfar, W. Badgett, A. Barbaro-Galtieri,Virgil E Barnes,B. A. Barnett,P. Barria,Pavol Bartos,Matteo Bauce,G. Bauer,Franco Bedeschi, D. Beecher,S. Behari, Giovanni Bellettini, J. N. Bellinger,D. P. Benjamin,Andrew Beretvas,A. Bhatti,M. Binkley,Dario Bisello, I. Bizjak, K. R. Bland,Barry Blumenfeld,Andrea Bocci,A. Bodek,Daniela Bortoletto,J. Boudreau, A. Boveia,Benjamin Brau, L. Brigliadori, A. Brisuda, C. Bromberg,Erik Brücken,M. Bucciantonio, J. Budagov,H. S. Budd,S. Budd,Kevin Burkett,G. Busetto, P. J. Bussey,Adrian Buzatu, C. Calancha,Stefano Camarda,Manuela Campanelli, M. Campbell,F. Canelli, A. Canepa, B. Carls,Duncan Carlsmith,Rodolfo Carosi, S. Carrillo, S. Carron, B. Casal,Massimo Casarsa,Andrea Castro, P. Catastini,D. Cauz, V. Cavaliere,Matteo Cavalli-Sforza,Alessandro Cerri,Lucio Cerrito, Y. C. Chen,Maxwell Chertok,Giorgio Chiarelli, G. Chlachidze,Frank Chlebana,Keunchang Cho,D. Chokheli,J. P. Chou,W. H. Chung,Y. S. Chung,C. I. Ciobanu,Maria Agnese Ciocci,Allan G Clark

Physical Review Letters（2011）

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摘要

This article reports a measurement of the cross section of prompt isolated photon pair production in p{bar p} collisions at a total energy {radical}s = 1.96 TeV using data of 5.36 fb{sup -1} integrated luminosity collected with the CDF II detector at the Fermilab Tevatron. The measured cross section, differential in basic kinematic variables, is compared with three perturbative QCD predictions, a leading order (LO) parton shower calculation and two next-to-leading order (NLO) calculations. The NLO calculations reproduce most aspects of the data. By including photon radiation from quarks before and after hard scattering, the parton shower prediction becomes competitive with the NLO predictions.

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