[PDF] Top 20 Measurement of dijet production with a veto on additional central jet activity in pp collisions at root s=7 TeV using the ATLAS detector

... Alternatively, the effects of wide-angle soft-gluon radiation can be studied in the limit that the average dijet transverse momentum is much larger than the scale used to ... See full document

... toroids. Jet measurements depend most heavily on the ...calorimeters. The electromagnetic calorimeter is a lead liquid-argon (LAr) detector with an accordion ...based on ... See full document

... system of two equations, expressing the number of W + 1 jet events and W + 2 jets events before and after b-tagging, can be written with six independent flavour fractions as the ... See full document

... The ATLAS detector [8] consists of an inner tracker, a calorime- ter and a muon ...system. The inner detector (ID) directly surrounds the interaction point; it includes a ... See full document

... made in this analysis with respect to what is reported in ...[3]. The dead material uncertainty, which is large in ...to the systematic uncertainty reported in ...an ... See full document

... interchanging the mod- elling between PYTHIA and HERWIG, and from the amount of initial-state and final-state radiation (ISR/FSR), estimated using dedicated AcerMC samples interfaced to PYTHIA ... See full document

... probe of higher-order QCD effects can be made by studying the azimuthal angle between the jets in the dijet system, ∆ φ ...back-to-back in azimuthal an- gle. Any ... See full document

... by using a data control sample to normalise the MC simulation. The control sample is defined by requiring the invariant mass of the soft muon and the muon from the ... See full document

... sign of the mean b-jet charge as the signal. The MC simulation is expected to predict correctly all the processes with the exception of the ... See full document

... The production of di-photon final states in proton- proton collisions may occur through quark-antiquark t-channel annihilation, q q ! , or via gluon-gluon in- teractions, gg ! , ... See full document

... included in the χ 2 fit. This relies on a detailed knowledge of the individual uncertainty components and their correlations with each ...to the χ 2 function using ... See full document

... to the measure- ments of event shapes are chosen in part for their ability to describe other ATLAS jet-based ...measurements. The multi- jet cross section measurements ... See full document

... inclusive jet pro- duction in Z= ! e þ e and Z= ! þ events in proton-proton collisions at p ffiffiffi s ¼ 7 ...TeV. The analysis con- siders the data ... See full document

... from the background sub- traction procedure, from the recoil response model and unfolding procedure, and from lepton reconstruction and calibration ...for the various uncertainties according to ... See full document

... calculated at parton level do not include underlying event, pile- up or hadronization ...While the ambient-energy density corrections to the photon isolation are expected to remove most of ... See full document

... In the 2011 data taking, the BCM was used as the baseline detector for the luminosity determi- ...consists of four independent detectors grouped into two sets of ... See full document

... dependence of the energy scale. Since the event topology and flavour composition (quark and gluon fractions) may be different in final states other than the considered inclusive ... See full document

... match the data in the signal-dominated low-x region. A jet-enriched sample is extracted from data by requiring electron candidates to fail the track-cluster matching or shower shape ... See full document

... The ATLAS detector [18] surrounds one of the proton– proton interaction points at the Large Hadron ...Collider. The inner tracking detector is composed ... See full document

... to the second layer of the LAr ...pairs of tracks originating from recon- structed conversion vertices in the inner detector or to single tracks with no hit ... See full document