Abstract
The measurements of rapidity gap cross sections and dijet production with a veto on additional central jet activity, performed at the ATLAS experiment at the LHC, are discussed. The rapidity gap cross section analysis measures the differential cross section as a function of the forward rapidity gap size. The data are compared to PYTHIA 8, PYTHIA 6 and PHOJET. The measured cross section is approximately 1mb per forward rapidity gap size for a gap size greater than 3. The measurement of dijet production with a veto on additional central jet activity studies the fraction of dijet events that remain after the application of a jet veto of 20 GeV in the rapidity interval bounded by the dijet system. This fraction is presented against the rapidity separation of the boundary dijets (in the range 0 < Δy < 6) and the average transverse momentum of the boundary jets (in the range 50 < pT < 500 GeV). The data are compared to a next-to-leading order plus parton shower prediction from the POWHEG-BOX and an all-order resummation using the HEJ calculation.
Highlights
The rapidity gap cross section and the dijet with jet veto analyses that were measured at the ATLAS experiment at the LHC are discussed
The rapidity gap cross section analysis measures the differential cross section as a function of the forward rapidity gap size. This diffractive cross section is compared to PYTHIA 8, PYTHIA 6 and PHOJET
The dijet with jet veto analysis measures the fraction of dijet events that remain after the application of a jet veto of 20 GeV in the rapidity region between the dijet system
Summary
The rapidity gap cross section analysis measures the differential cross section as a function of the forward rapidity gap size. This diffractive cross section is compared to PYTHIA 8, PYTHIA 6 and PHOJET. The dijet with jet veto analysis measures the fraction of dijet events that remain after the application of a jet veto of 20 GeV in the rapidity region between the dijet system. This fraction is presented against the rapidity separation of the boundary dijets (in the range 0 < ∆y < 6) and the average transverse momentum of the boundary jets (in the range 50 < pT < 500 GeV).
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