Diffractive Phenomena at Tevatron

TL;DR

This paper reports on the observation of diffractive phenomena in proton-antiproton collisions at Tevatron, including single and double pomeron exchange events, with plans to enhance analysis using a forward proton detector.

Contribution

It provides the first evidence of diffractive dijet events with rapidity gaps at Tevatron energies and discusses plans for improved detection in future runs.

Findings

Observation of dijet events with rapidity gaps at 1800 GeV and 630 GeV.

Evidence supporting hard single and double pomeron exchange processes.

Plans for extending analysis with a forward proton detector.

Abstract

Preliminary results from the D0 experiment on jet production with rapidity gaps in $p\bar{p}$ collisions are presented. A class of dijet events with a forward rapidity gap is observed at center-of-mass energies $\sqrt{s}$ = 1800 GeV and 630 GeV. The number of events with rapidity gaps at both center-of-mass energies is significantly greater than the expectation from multiplicity fluctuations and is consistent with a hard single diffractive process. A class of events with two forward gaps and central dijets are also observed at 1800 GeV. This topology is consistent with hard double pomeron exchange. We also present proposed plans for extending these analysis into Run II through the use of a forward proton detector.