Ratio of Isolated Photon Cross Sections in pp̅ Collisions at √s = 630 and 1800 GeV

Authors

V. M. Abazov, Joint Institute for Nuclear Research, Dubna, Russia
Gregory R. Snow, University of Nebraska-LincolnFollow
D0 Collaboration

Date of this Version

12-17-2001

Comments

Published by American Physical Society. Phys. Rev. Lett.VOLUME 87, NUMBER 25 (2001). http://prl.aps.org. Copyright © 2001 American Physical Society. Used by permission.

Abstract

The inclusive cross section for production of isolated photons has been measured in pp̅ collisions at √s = 630 GeV with the D0 detector at the Fermilab Tevatron Collider. The photons span a transverse energy (E_T) range from 7–49 GeV and have pseudorapidity∣η∣ < 2.5. This measurement is combined with the previous D0 result at √s = 1800 GeV to form a ratio of the cross sections. Comparison of next-to-leading-order QCD with the measured cross section at 630 GeV and the ratio of cross sections show satisfactory agreement in most of the E_T range.