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

The ATLAS collaboration

doi:10.1140/epjc/s10052-013-2301-5

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

The ATLAS collaboration

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

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.

Original language	English
Article number	2301
Journal	European Physical Journal C
Volume	73
Issue number	2
DOIs	https://doi.org/10.1140/epjc/s10052-013-2301-5
State	Published - 12 Feb 2013

Funding

Funders	Funder number
CEA-DSM
Cantons of Bern and Geneva
Czech Republic
DIP
DNSRC
GNAS
IRFU
MECTS
MERYS
MES of Russia
MSMT
MSSR
MSTD
MVZT
VSC CR
Wallenberg Foundation
National Science Foundation
U.S. Department of Energy
Alexander von Humboldt-Stiftung
Departamento Administrativo de Ciencia, Tecnología e Innovación (COLCIENCIAS)
Türkiye Atom Enerjisi Kurumu
Seventh Framework Programme	246806
Seventh Framework Programme
Arizona-Nevada Academy of Science
CERN
Natural Sciences and Engineering Research Council of Canada
National Research Council Canada
Canada Foundation for Innovation
Science and Technology Facilities Council	PP/E002757/1, PP/E000347/1, ST/H001069/2, ST/L001195/1, ST/H001042/1, ST/H001042/2, ST/J004928/1, ST/K001361/1, ST/L001004/1, ST/K001310/1, ST/L00352X/1, ST/K001337/1, ST/J501074/1, ST/L001144/1, ST/L003112/1, ST/K000659/1, ST/K001248/1, ST/L003325/1, ST/M000761/1, ST/I505756/1, ST/H001093/2, ST/M001431/1, ST/K001418/1, ST/H001093/1, ST/K003496/1, ST/K001388/1, PP/E000487/1, ST/F007418/1, PP/E003699/2, PP/E003699/1, ST/K000713/1, ST/K50208X/1, ST/F007337/1, ST/I005803/1, ST/J004944/1, ST/K501840/1, ST/I006080/1, ST/I000186/1, ST/G502320/1, ST/K003437/1, ATLAS, ST/M000664/1, ST/H00100X/1, ST/L000970/1, ST/K00073X/1, ST/H00100X/2, ST/K000705/1, ST/I005811/1, ST/J005541/1, PP/E003087/1, ST/J005460/1, PP/E000355/1, ST/J004936/1, ST/K00140X/1, ST/M001474/1, ST/F00754X/1, ST/I003525/1, ST/K003658/1, ST/H00095X/2, ST/H00095X/1, ST/J005576/1
Science and Technology Facilities Council
Leverhulme Trust
Royal Society
European Commission	IN2P3-CNRS
European Commission
European Research Council
Australian Research Council
Department of Science and Technology, Ministry of Science and Technology, India
Helmholtz-Gemeinschaft
Minerva Foundation
Deutsche Forschungsgemeinschaft
Japan Society for the Promotion of Science
Ministry of Education, Culture, Sports, Science and Technology
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung
Stichting voor Fundamenteel Onderzoek der Materie
Danmarks Grundforskningsfond
German-Israeli Foundation for Scientific Research and Development
Fundação de Amparo à Pesquisa do Estado de São Paulo
National Natural Science Foundation of China
National Science Council
Fundação para a Ciência e a Tecnologia
Bundesministerium für Bildung und Forschung
Chinese Academy of Sciences
Comisión Nacional de Investigación Científica y Tecnológica
Agencia Nacional de Promoción Científica y Tecnológica
Nederlandse Organisatie voor Wetenschappelijk Onderzoek
General Secretariat for Research and Technology
Lundbeckfonden
Conselho Nacional de Desenvolvimento Científico e Tecnológico
National Research Foundation of Korea
Joint Institute for Nuclear Research
Nella and Leon Benoziyo Center for Neurological Diseases, Weizmann Institute of Science
Israel Science Foundation
Instituto Nazionale di Fisica Nucleare
Max-Planck-Gesellschaft
Javna Agencija za Raziskovalno Dejavnost RS
Ministerstwo Edukacji i Nauki
Ministry of Science and Technology, Taiwan
Ministerio de Ciencia e Innovación
Centre National pour la Recherche Scientifique et Technique
Bundesministerium für Wissenschaft und Forschung
State Atomic Energy Corporation ROSATOM
Council on grants of the President of the Russian Federation
Sociedad Española de Reumatología

Access to Document

10.1140/epjc/s10052-013-2301-5

Cite this

@article{6a79341e07924bc9ab76633d7b757c8c,

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

abstract = "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.",

author = "{The ATLAS collaboration} and G. Aad and T. Abajyan and B. Abbott and J. Abdallah and Khalek, {S. Abdel} and Abdelalim, {A. A.} and O. Abdinov and R. Aben and B. Abi and M. Abolins and Zeid, {O. S.Abou} and H. Abramowicz and H. Abreu and E. Acerbi and Acharya, {B. S.} and L. Adamczyk and Adams, {D. L.} and Addy, {T. N.} and J. Adelman and S. Adomeit and P. Adragna and T. Adye and S. Aefsky and Aguilar-Saavedra, {J. A.} and M. Agustoni and M. Aharrouche and Ahlen, {S. P.} and F. Ahles and A. Ahmad and M. Ahsan and G. Aielli and T. Akdogan and {\AA}kesson, {T. P.A.} and G. Akimoto and Akimov, {A. V.} and Alam, {M. S.} and Alam, {M. A.} and J. Albert and S. Albrand and M. Aleksa and Aleksandrov, {I. N.} and F. Alessandria and C. Alexa and G. Alexander and L. Barak and G. Bella and Y. Benhammou and E. Etzion and Y. Oren and A. Soffer",

note = "Publisher Copyright: {\textcopyright} CERN for the benefit of the ATLAS collaboration 2013.",

year = "2013",

month = feb,

day = "12",

doi = "10.1140/epjc/s10052-013-2301-5",

language = "אנגלית",

volume = "73",

journal = "European Physical Journal C",

issn = "1434-6044",

publisher = "Springer New York",

number = "2",

}

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 - Barak, L.

AU - Bella, G.

AU - Benhammou, Y.

AU - Etzion, E.

AU - Oren, Y.

AU - Soffer, A.

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.

UR - http://www.scopus.com/inward/record.url?scp=84876303722&partnerID=8YFLogxK

U2 - 10.1140/epjc/s10052-013-2301-5

DO - 10.1140/epjc/s10052-013-2301-5

M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???

AN - SCOPUS:84876303722

SN - 1434-6044

VL - 73

JO - European Physical Journal C

JF - European Physical Journal C

IS - 2

M1 - 2301

ER -

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

Abstract

Funding

Access to Document

Other files and links

Fingerprint

Cite this