Abstract
Jet shapes have been measured in inclusive jet production in proton-proton collisions at sqrt(s) = 7 TeV using 3 pb^{-1} of data recorded by the ATLAS experiment at the LHC. Jets are reconstructed using the anti-kt algorithm with transverse momentum 30 GeV < pT < 600 GeV and rapidity in the region |y| < 2.8. The data are corrected for detector effects and compared to several leading-order QCD matrix elements plus parton shower Monte Carlo predictions, including different sets of parameters tuned to model fragmentation processes and underlying event contributions in the final state. The measured jets become narrower with increasing jet transverse momentum and the jet shapes present a moderate jet rapidity dependence. Within QCD, the data test a variety of perturbative and non-perturbative effects. In particular, the data show sensitivity to the details of the parton shower, fragmentation, and underlying event models in the Monte Carlo generators. For an appropriate choice of the parameters used in these models, the data are well described.
Highlights
The study of the jet shapes [1] in proton-proton collisions provides information about the details of the partonto-jet fragmentation process, leading to collimated flows of particles in the final state
The predictions of PYTHIA-Perugia2010, HERWIG þ þ, ALPGEN interfaced with HERWIG and JIMMY, and PYTHIA-MC09 are shown for comparison
The data are compared to the predictions of: (a) PYTHIA-Perugia2010, HERWIG þ þ, ALPGEN interfaced with HERWIG and JIMMY, and PYTHIA-MC09; (b) PYTHIA-Perugia2010, PYTHIA-Perugia2010 without underlying event (UE), and PYTHIA-DW
Summary
The study of the jet shapes [1] in proton-proton collisions provides information about the details of the partonto-jet fragmentation process, leading to collimated flows of particles in the final state. The shape of the jet depends on the type of partons (quark or gluon) that give rise to jets in the final state [3], and is sensitive to nonperturbative fragmentation effects and underlying event (UE) contributions from the interaction between proton remnants. Measurements of differentpiaffilffi shapes in proton-proton collisions at s and 1⁄47 integrated jet TeV are presented for the first time. Detector effects and compared to several Monte Carlo (MC) predictions based on pQCD leading-order (LO) matrix elements plus parton showers, and including different phenomenological models to describe fragmentation processes and UE contributions.
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