Survival probability for diffractive dijet production in p-pbar collisions from next-to-leading order calculations

TL;DR

This paper calculates the probability that a rapidity gap survives in diffractive dijet production in proton-antiproton collisions at the Tevatron using next-to-leading order QCD, revealing a dependence on parton momentum fraction.

Contribution

It provides the first NLO calculation of diffractive and non-diffractive dijet cross sections and analyzes the survival probability's dependence on parton momentum fraction.

Findings

Survival probability varies with parton momentum fraction in p-pbar collisions.

The suppression factor differs from that observed in photoproduction.

Results support the interpretation of diffractive structure functions with suppression factors.

Abstract

We perform next-to-leading order calculations of the single-diffractive and non-diffractive cross sections for dijet production in proton-antiproton collisions at the Tevatron. By comparing their ratio to the data published by the CDF collaboration for two different center-of-mass energies, we deduce the rapidity-gap survival probability as a function of the momentum fraction of the parton in the antiproton. Assuming Regge factorization, this probability can be interpreted as a suppression factor for the diffractive structure function measured in deep-inelastic scattering at HERA. In contrast to the observations for photoproduction, the suppression factor in proton-antiproton collisions depends on the momentum fraction of the parton in the Pomeron even at next-to-leading order.