Abstract
A measurement of jet activity in the rapidity interval bounded by a dijet system is performed using pp collisions at 7 TeV recorded by the ATLAS detector in 2010. The data are compared to LO predictions from PYTHIA, HERWIG++ and ALPGEN event generators. The data are also compared to NLO parton shower prediction from POWHEG, when interfaced to PYTHIA or HERWIG parton shower, and all order resummation prediction from HEJ. In most of the phase-space regions presented, the experimental uncertainty is much smaller than the spread of LO Monte Carlo event generator predictions. In general, POWHEG+PYTHIA gave the best description of the data.
Highlights
A measurement of jet activity in the rapidity interval bounded by a dijet system is performed using pp collisions at 7 TeV recorded by the ATLAS detector in 2010
The data are compared to next-to-leading order (NLO) parton shower prediction from POWHEG, when interfaced to pythia or herwig parton shower, and all order resummation prediction from HEJ
A central jet veto was used to study the fraction of events that do not contain hadronic activity in the rapidity interval bounded by a dijet system
Summary
The measurement was performed using data taken during 2010. The primary trigger selections used to readout the ATLAS detector were the calorimeter jet triggers. Distinct regions of pT were defined and, in each region, only events that passed a specific jet trigger (at least one jet above a defined threshold) were used. To minimise the impact of pile-up, each event was required to have exactly one reconstructed primary vertex, defined as a vertex with at least five tracks that was consistent with the beamspot. The gap fraction was found to be independent of the data taking period after the single vertex requirement
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