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

Abstract

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

17 pages plus author list and cover page (34 pages total), 6 figures submitted to Phys. Lett. B. All figures including auxiliary figures are available at URL http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2014-04

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Cited by in corpus (24)

• The Large Hadron-Electron Collider at the HL-LHC
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• Diffractive dijet photoproduction in ultraperipheral collisions at the LHC in next-to-leading order QCD
• Hard Diffraction with Dynamic Gap Survival
• Hard diffraction in photoproduction with Pythia 8
• Photon and Pomeron -- induced production of Dijets in $pp$, $pA$ and $AA$ collisions
• Precision searches in dijets at the HL-LHC and HE-LHC
• Measurement of differential cross sections for single diffractive dissociation in $\sqrt{s}=8$ TeV $pp$ collisions using the ATLAS ALFA spectrometer
• Measurement of inclusive very forward jet cross sections in proton-lead collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV
• Diffractive di-jet production at the LHC with a Reggeon contribution
• Measurement of single-diffractive dijet production in proton-proton collisions at $\sqrt{s}=$ 8 TeV with the CMS and TOTEM experiments
• Exclusive and diffractive ${\mu }^{+}{\mu }^{-}$ production in $pp$ collisions at the LHC
• Slow neutron production as a probe of hadron formation in high-energy ${\gamma }^{\ast }A$ reactions
• Hunting for QCD Instantons at the LHC in Events with Large Rapidity Gaps
• Hard diffractive ${\eta }_{\mathrm{c},\mathrm{b}}$ hadroproduction at the LHC
• Inelastic cross-section and Survival Probabilities at LHC in mini-jet models
• Rapidity Gap Survival in Enhanced Pomeron Scheme
• Single-diffractive production of charmed mesons at the LHC within the $k_t$-factorization approach
• Inclusive diffractive ${\eta }_{\mathrm{c}}$ production in pp, pA and AA modes at the LHC
• Double heavy quarkonium production in diffractive processes at the Run 2 LHC energy
• Searches for QCD instantons with forward proton tagging
• Study of dijet events with a large rapidity gap between the two leading jets in pp collisions at $\sqrt{s}$ = 7 TeV
• ATLAS results on diffraction and exclusive production
• The non-diffractive pp cross-section and Survival Probabilities at LHC