Dijet production in √s= 7 TeV pp collisions with large rapidity gaps at the ATLAS experiment

Mullier, Geoffrey; Haug, Sigve; Weber, Michael; Meloni, Federico; Cervelli, Alberto; Beck, Hans Peter; Stucci, Stefania; Ereditato, Antonio (2016). Dijet production in √s= 7 TeV pp collisions with large rapidity gaps at the ATLAS experiment. Physics letters. B, 754, pp. 214-234. Elsevier 10.1016/j.physletb.2016.01.028

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A 6.8 nb⁻¹ sample of pp collision data collected under low-luminosity conditions at √s=7 TeV by the ATLAS detector at the Large Hadron Collider is used to study diffractive dijet production. Events containing at least two jets with pT >20 GeV are selected and analysed in terms of variables which discriminate between diffractive and non-diffractive processes. Cross sections are measured differentially in ΔηF, the size of the observable forward region of pseudorapidity which is devoid of hadronic activity, and in an estimator, ξ , of the fractional momentum loss of the proton assuming single diffractive dissociation (pp→pX ). Model comparisons indicate a dominant non-diffractive contribution up to moderately large Δη F and small ξ, with a diffractive contribution which is significant at the highest ΔηF and the lowest ξ. The rapidity-gap survival probability is estimated from comparisons of the data in this latter region with predictions based on diffractive parton distribution functions.

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