Abstract
Measurements are presented of the properties of high transverse momentum jets, produced in proton-proton collisions at a center-of-mass energy of sqrt(s) = 7 TeV. The data correspond to an integrated luminosity of 35 pb^-1 and were collected with the ATLAS detector in 2010. Jet mass, width, eccentricity, planar flow and angularity are measured for jets reconstructed using the anti-kt algorithm with distance parameters R = 0.6 and 1.0, with transverse momentum pT > 300 GeV and pseudorapidity |eta| < 2. The measurements are compared to the expectations of Monte Carlo generators that match leading-logarithmic parton showers to leading-order, or next-to-leading-order, matrix elements. The generators describe the general features of the jets, although discrepancies are observed in some distributions.
Highlights
The high center-of-mass energy at the Large Hadron Collider (LHC) combined with the coverage and granularity of the ATLAS calorimeter provide an excellent environment to study hadronic jets
The observable jet properties presented here are mass, width, eccentricity, planar flow and angularity. All of these have been shown to be useful in Monte Carlo studies in the search for high transverse momentum, massive particles [8,9,10,11,12,13,14], and together they provide an important set of probes of the substructure of jets
This tune of PYTHIA is used in the calculation of the systematic uncertainties on the measurements and for comparison with the data, along with the HERWIG++ 2.4.2 generator with its default settings [29]
Summary
The high center-of-mass energy at the Large Hadron Collider (LHC) combined with the coverage and granularity of the ATLAS calorimeter provide an excellent environment to study hadronic jets. The observable jet properties presented here are mass, width, eccentricity, planar flow and angularity All of these have been shown to be useful in Monte Carlo studies in the search for high transverse momentum (pT), massive particles [8,9,10,11,12,13,14], and together they provide an important set of probes of the substructure of jets. Jet substructure measurements can be vulnerable to ‘‘pileup,’’ i.e. particles produced in multiple pp interactions that occur in addition to the primary interaction, within the sensitive time of the detector These additional interactions result in diffuse, usually soft, energy deposits throughout the central region of the detector—the region of interest for the study of high-pT jets.
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