Observation of a diffractive contribution to dijet production in proton-proton collisions at $\sqrt{s} = 7$ TeV

TL;DR

This paper reports the first observation of single diffractive dijet production at the LHC, using the CMS detector to measure the differential cross section as a function of proton momentum loss, distinguishing diffractive from nondiffractive events.

Contribution

It presents the first measurement of diffractive dijet production at the LHC, demonstrating the diffractive contribution in proton-proton collisions at 7 TeV.

Findings

First observation of single diffractive dijets at LHC

Differential cross section as a function of proton momentum loss

Evidence of diffractive processes in high-energy proton collisions

Abstract

The differential cross section measurement for dijet production at proton-proton collisions at $\sqrt{s}=7$ TeV is presented as a function of an approximation for the fractional momentum loss of the scattered proton ($\tilde{\xi}$), an useful observable to distinguish model predictions of diffractive and nondiffractive components. The data was collected by the CMS detector at low instantaneous luminosity runs at LHC, corresponding to an integrated luminosity of $2.7 {\rm nb}^{-1}$. This is the first observation of single diffractive dijets at LHC.