Research Papers in Physics and Astronomy


Date of this Version

December 2001


Published by American Physical Society. Phys. Rev. Lett.VOLUME 87, NUMBER 25 (2001). Copyright © 2001 American Physical Society. Used by permission.


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 (ET) 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 ET range.

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