Measurement of the flavour composition of dijet events in pp collisions at √s = 7 TeV with the ATLAS detector

This paper describes a measurement of the flavour composition of dijet events produced in pp collisions at √s = 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 j...

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Autor principal: Aad, G.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_14346044_v73_n2_p_Aad
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_14346044_v73_n2_p_Aad2023-10-03T16:14:51Z Measurement of the flavour composition of dijet events in pp collisions at √s = 7 TeV with the ATLAS detector Aad, G. This paper describes a measurement of the flavour composition of dijet events produced in pp collisions at √s = 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. © CERN for the benefit of the ATLAS collaboration 2013. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_14346044_v73_n2_p_Aad
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description This paper describes a measurement of the flavour composition of dijet events produced in pp collisions at √s = 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. © CERN for the benefit of the ATLAS collaboration 2013.
format JOUR
author Aad, G.
spellingShingle Aad, G.
Measurement of the flavour composition of dijet events in pp collisions at √s = 7 TeV with the ATLAS detector
author_facet Aad, G.
author_sort Aad, G.
title Measurement of the flavour composition of dijet events in pp collisions at √s = 7 TeV with the ATLAS detector
title_short Measurement of the flavour composition of dijet events in pp collisions at √s = 7 TeV with the ATLAS detector
title_full Measurement of the flavour composition of dijet events in pp collisions at √s = 7 TeV with the ATLAS detector
title_fullStr Measurement of the flavour composition of dijet events in pp collisions at √s = 7 TeV with the ATLAS detector
title_full_unstemmed Measurement of the flavour composition of dijet events in pp collisions at √s = 7 TeV with the ATLAS detector
title_sort measurement of the flavour composition of dijet events in pp collisions at √s = 7 tev with the atlas detector
url http://hdl.handle.net/20.500.12110/paper_14346044_v73_n2_p_Aad
work_keys_str_mv AT aadg measurementoftheflavourcompositionofdijeteventsinppcollisionsats7tevwiththeatlasdetector
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