Hard Single Diffraction in pbarp Collisions at root-s = 630 and 1800 GeV

TL;DR

This paper investigates hard single diffraction in proton-antiproton collisions at 630 and 1800 GeV using the D0 detector, focusing on rapidity gaps, jet production, and comparing results with Monte Carlo models.

Contribution

It provides the first detailed measurements of rapidity gap events and fractional momentum loss in hard diffractive processes at these energies.

Findings

Measured fractions of gap-associated jet events at both energies.

Compared experimental results with Monte Carlo model predictions.

Extracted fractional momentum loss of scattered protons in diffractive events.

Abstract

Using the D0 detector, we have studied events produced in proton-antiproton collisions that contain large forward regions with very little energy deposition (``rapidity gaps'') and concurrent jet production at center-of-mass energies of root-s = 630 and 1800 Gev. The fractions of forward and central jet events associated with such rapidity gaps are measured and compared to predictions from Monte Carlo models. For hard diffractive candidate events, we use the calorimeter to extract the fractional momentum loss of the scattered protons.