TY - JOUR
T1 - Measurement of the flavour composition of dijet events in pp collisions at √s = 7 TeV with the ATLAS detector
AU - The ATLAS Collaboration
AU - Aad, G.
AU - Abajyan, T.
AU - Abbott, B.
AU - Abdallah, J.
AU - Khalek, S. Abdel
AU - Abdelalim, A. A.
AU - Abdinov, O.
AU - Aben, R.
AU - Abi, B.
AU - Abolins, M.
AU - Zeid, O. S.Abou
AU - Abramowicz, H.
AU - Abreu, H.
AU - Acerbi, E.
AU - Acharya, B. S.
AU - Adamczyk, L.
AU - Adams, D. L.
AU - Addy, T. N.
AU - Adelman, J.
AU - Adomeit, S.
AU - Adragna, P.
AU - Adye, T.
AU - Aefsky, S.
AU - Aguilar-Saavedra, J. A.
AU - Agustoni, M.
AU - Aharrouche, M.
AU - Ahlen, S. P.
AU - Ahles, F.
AU - Ahmad, A.
AU - Ahsan, M.
AU - Aielli, G.
AU - Akdogan, T.
AU - Åkesson, T. P.A.
AU - Akimoto, G.
AU - Akimov, A. V.
AU - Alam, M. S.
AU - Alam, M. A.
AU - Albert, J.
AU - Albrand, S.
AU - Aleksa, M.
AU - Aleksandrov, I. N.
AU - Alessandria, F.
AU - Alexa, C.
AU - Alexander, G.
AU - Alexandre, G.
AU - Alexopoulos, T.
AU - Alhroob, M.
AU - Aliev, M.
AU - Alimonti, G.
AU - Sasao, N.
N1 - Funding Information:
We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT, Chile; CAS, MOST and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF, DNSRC and Lundbeck Foundation, Denmark; EPLANET and ERC, European Union; IN2P3-CNRS, CEA-DSM/IRFU, France; GNAS, Georgia; BMBF, DFG, HGF, MPG and AvH Foundation, Germany; GSRT, Greece; ISF, MINERVA, GIF, DIP and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; FOM and NWO, Netherlands; RCN, Norway; MNiSW, Poland; GRICES and FCT, Portugal; MERYS (MECTS), Romania; MES of Russia and ROSATOM, Russian Federation; JINR; MSTD, Serbia; MSSR, Slovakia; ARRS and MVZT, Slovenia; DST/NRF, South Africa; MICINN, Spain; SRC and Wallenberg Foundation, Sweden; SER, SNSF and Cantons of Bern and Geneva, Switzerland; NSC, Taiwan; TAEK, Turkey; STFC, the Royal Society and Leverhulme Trust, United Kingdom; DOE and NSF, United States of America.
Publisher Copyright:
© CERN for the benefit of the ATLAS collaboration 2013.
PY - 2013/2/12
Y1 - 2013/2/12
N2 - 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.
AB - 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.
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U2 - 10.1140/epjc/s10052-013-2301-5
DO - 10.1140/epjc/s10052-013-2301-5
M3 - Article
AN - SCOPUS:84876303722
SN - 1434-6044
VL - 73
JO - Zeitschrift fur Physik C-Particles and Fields
JF - Zeitschrift fur Physik C-Particles and Fields
IS - 2
M1 - 2301
ER -