Comparison of the isolated direct photon cross sections in [Formula Presented] collisions at [Formula Presented] and [Formula Presented]

Published

Journal Article

We have measured the cross sections (Formula presented) for production of isolated direct photons in (Formula presented) collisions at two different center-of-mass energies, 1.8 TeV and 0.63 TeV, using the Collider Detector at Fermilab. The normalization of both data sets agrees with the predictions of quantum chromodynamics for a photon transverse momentum (Formula presented) of 25 GeV/c, but the shapes versus photon (Formula presented) do not. These shape differences lead to a significant disagreement in the ratio of cross sections in the scaling variable (Formula presented) This disagreement in the (Formula presented) ratio is difficult to explain with conventional theoretical uncertainties such as scale dependence and parton distribution parametrizations. © 2002 The American Physical Society.

Full Text

Duke Authors

Cited Authors

  • Acosta, D; Affolder, T; Akimoto, H; Albrow, MG; Ambrose, D; Amidei, D; Anikeev, K; Antos, J; Apollinari, G; Arisawa, T; Artikov, A; Asakawa, T; Ashmanskas, W; Azfar, F; Azzi-Bacchetta, P; Bacchetta, N; Bachacou, H; Badgett, W; Bailey, S; de Barbaro, P; Barbaro-Galtieri, A; Barnes, VE; Barnett, BA; Baroiant, S; Barone, M; Bauer, G; Bedeschi, F; Belforte, S; Bell, WH; Bellettini, G; Bellinger, J; Benjamin, D; Bensinger, J; Beretvas, A; Berge, JP; Berryhill, J; Bhatti, A; Binkley, M; Bisello, D; Bishai, M; Blair, RE; Blocker, C; Bloom, K; Blumenfeld, B; Blusk, SR; Bocci, A; Bodek, A; Bolla, G; Bonushkin, Y; Bortoletto, D; Boudreau, J; Brandl, A; van den Brink, S; Bromberg, C; Brozovic, M; Brubaker, E; Bruner, N; Budagov, J; Budd, HS; Burkett, K; Busetto, G; Byon-Wagner, A; Byrum, KL; Cabrera, S; Calafiura, P; Campbell, M; Carithers, W; Carlson, J; Carlsmith, D; Caskey, W; Castro, A; Cauz, D; Cerri, A; Chan, AW; Chang, PS; Chang, PT; Chapman, J; Chen, C; Chen, YC; Cheng, MT; Chertok, M; Chiarelli, G; Chirikov-Zorin, I; Chlachidze, G; Chlebana, F; Christofek, L; Chu, ML; Chung, JY; Chung, WH; Chung, YS; Ciobanu, CI; Clark, AG; Coca, M; Colijn, AP; Connolly, A; Convery, M; Conway, J; Cordelli, M; Cranshaw, J; Culbertson, R

Published Date

  • January 1, 2002

Published In

Volume / Issue

  • 65 / 11

Start / End Page

  • 10 -

Electronic International Standard Serial Number (EISSN)

  • 1550-2368

International Standard Serial Number (ISSN)

  • 1550-7998

Digital Object Identifier (DOI)

  • 10.1103/PhysRevD.65.112003

Citation Source

  • Scopus