Jet Production via Strongly-Interacting Color-Singlet Exchange in $p\bar{p}$ Collisions

TL;DR

This paper investigates jet production in proton-antiproton collisions, finding evidence for color-singlet exchange processes through an excess of low-multiplicity events between widely separated jets.

Contribution

It provides the first measurement of the fraction of dijet events involving color-singlet exchange in $par{p}$ collisions at Tevatron energies.

Findings

Observed a 1.07% excess of low-multiplicity events consistent with color-singlet exchange.

Established a lower limit of 0.80% on the fraction of such events at 95% confidence level.

Results suggest colorless exchange contributes significantly beyond electroweak processes.

Abstract

A study of the particle multiplicity between jets with large rapidity separation has been performed using the D{\O}detector at the Fermilab Tevatron $p\bar{p}$ Collider operating at $\sqrt{s}=1.8$ TeV. A significant excess of low-multiplicity events is observed above the expectation for color-exchange processes. The measured fractional excess is $1.07 \pm 0.10({\rm stat})^{+ 0.25}_{- 0.13}({\rm syst})%$, which is consistent with a strongly-interacting color-singlet (colorless) exchange process and cannot be explained by electroweak exchange alone. A lower limit of 0.80% (95% C.L.) is obtained on the fraction of dijet events with color-singlet exchange, independent of the rapidity gap survival probability.