Measurement of the flavour composition of dijet events in pp collisions at √s =7 TeV with the ATLAS detector
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Measurement of the flavour.pdf
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2.06 MB
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8315ff050336250952bdc3288ea688bc
Author(s)
Taylor, Frank E
Date Issued
December 2012
Journal
The European Physical Journal C
Publisher
Springer-Verlag
Citation
The ATLAS Collaboration et al. “Measurement of the Flavour Composition of Dijet Events in Pp Collisions at √s=7 TeV with the ATLAS Detector.” The European Physical Journal C 73.2 (2013): n. pag. © 2013 CERN for the benefit of the ATLAS collaboration
Version
Final published version
Abstract
This paper describes a measurement of the flavour composition of dijet events produced in pp collisions at s√=7~TeVs=7~TeV using the ATLAS detector. The measurement uses the full 2010 data sample, corresponding to an integrated luminosity of 39 pb−1. Six possible combinations of light, charm and bottom jets are identified in the dijet events, where the jet flavour is defined by the presence of bottom, charm or solely light flavour hadrons in the jet. Kinematic variables, based on the properties of displaced decay vertices and optimised for jet flavour identification, are used in a multidimensional template fit to measure the fractions of these dijet flavour states as functions of the leading jet transverse momentum in the range 40 GeV to 500 GeV and jet rapidity |y|<2.1. The fit results agree with the predictions of leading- and next-to-leading-order calculations, with the exception of the dijet fraction composed of bottom and light flavour jets, which is underestimated by all models at large transverse jet momenta. The ability to identify jets containing two b-hadrons, originating from e.g. gluon splitting, is demonstrated. The difference between bottom jet production rates in leading and subleading jets is consistent with the next-to-leading-order predictions.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1140/epjc/s10052-013-2301-5
