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A $6.8 \ {\rm nb^{-1}}$ sample of $pp$ collision data collected underlow-luminosity conditions at $\sqrt{s} = 7$ TeV by the ATLAS detector at theLarge Hadron Collider is used to study diffractive dijet production. Eventscontaining at least two jets with $p_\mathrm{T} > 20$ GeV are selected andanalysed in terms of variables which discriminate between diffractive andnon-diffractive processes. Cross sections are measured differentially in$\Delta\eta^F$, the size of the observable forward region of pseudorapiditywhich is devoid of hadronic activity, and in an estimator, $\tilde{\xi}$, ofthe fractional momentum loss of the proton assuming single diffractivedissociation ($pp \rightarrow pX$). Model comparisons indicate a dominantnon-diffractive contribution up to moderately large $\Delta\eta^F$ and small$\tilde{\xi}$, with a diffractive contribution which is significant at thehighest $\Delta\eta^F$ and the lowest $\tilde{\xi}$. The rapidity-gap survivalprobability is estimated from comparisons of the data in this latter regionwith predictions based on diffractive parton distribution functions.

Dijet production in $\sqrt{s}=7$ TeV $pp$ collisions with large rapidity gaps at the ATLAS experiment