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Study of heavy-flavor quarks produced in association with top-quark pairs at s =7TeV using the ATLAS detector

Publication ,  Journal Article
Aad, G; Abajyan, T; Abbott, B; Abdallah, J; Abdel Khalek, S; Abdelalim, AA; Abdinov, O; Aben, R; Abi, B; Abolins, M; Abouzeid, OS; Abreu, H ...
Published in: Physical Review D - Particles, Fields, Gravitation and Cosmology
April 21, 2014
Published version (DOI)

Using a sample of dilepton top-quark pair (tt̄) candidate events, a study is performed of the production of top-quark pairs together with heavy-flavor (HF) quarks, the sum of tt̄+b+X and tt̄+c+X, collectively referred to as tt̄+HF. The data set used corresponds to an integrated luminosity of 4.7fb-1 of proton-proton collisions at a center-of-mass energy of 7 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. The presence of additional HF (b or c) quarks in the tt̄ sample is inferred by looking for events with at least three b-tagged jets, where two are attributed to the b quarks from the tt̄ decays and the third to additional HF production. The dominant background to tt̄+HF in this sample is tt̄+jet events in which a light-flavor jet is misidentified as a heavy-flavor jet. To determine the heavy- and light-flavor content of the additional b-tagged jets, a fit to the vertex mass distribution of b-tagged jets in the sample is performed. The result of the fit shows that 79±14(stat)±22(syst) of the 105 selected extra b-tagged jets originate from HF quarks, 3 standard deviations away from the hypothesis of zero tt̄+HF production. The result for extra HF production is quoted as a ratio (RHF) of the cross section for tt̄+HF production to the cross section for tt̄ production with at least one additional jet. Both cross sections are measured in a fiducial kinematic region within the ATLAS acceptance. RHF is measured to be [6.2±1.1(stat)±1.8(syst)]% for jets with pT>25GeV and |η|<2.5, in agreement with the expectations from Monte Carlo generators. © 2014 CERN, for the ATLAS Collaboration.

Duke Scholars

Mark C. Kruse
Author Mark C. Kruse Physics
Ayana T. Arce
Author Ayana T. Arce Physics
Alfred T. Goshaw
Author Alfred T. Goshaw Physics
Ashutosh V. Kotwal
Author Ashutosh V. Kotwal Physics
Seog Oh
Author Seog Oh Physics
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Published In

Physical Review D - Particles, Fields, Gravitation and Cosmology

DOI

10.1103/PhysRevD.89.072012

EISSN

1550-2368

ISSN

1550-7998

Publication Date

April 21, 2014

Volume

89

Issue

7

Related Subject Headings

  • Nuclear & Particles Physics
  • 5107 Particle and high energy physics
  • 5101 Astronomical sciences
  • 4902 Mathematical physics
  • 0206 Quantum Physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences
 

Citation

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MLA
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Aad, G., Abajyan, T., Abbott, B., Abdallah, J., Abdel Khalek, S., Abdelalim, A. A., … Armbruster, A. J. (2014). Study of heavy-flavor quarks produced in association with top-quark pairs at s =7TeV using the ATLAS detector. Physical Review D - Particles, Fields, Gravitation and Cosmology, 89(7). https://doi.org/10.1103/PhysRevD.89.072012
Aad, G., T. Abajyan, B. Abbott, J. Abdallah, S. Abdel Khalek, A. A. Abdelalim, O. Abdinov, et al. “Study of heavy-flavor quarks produced in association with top-quark pairs at s =7TeV using the ATLAS detector.” Physical Review D - Particles, Fields, Gravitation and Cosmology 89, no. 7 (April 21, 2014). https://doi.org/10.1103/PhysRevD.89.072012.
Aad G, Abajyan T, Abbott B, Abdallah J, Abdel Khalek S, Abdelalim AA, et al. Study of heavy-flavor quarks produced in association with top-quark pairs at s =7TeV using the ATLAS detector. Physical Review D - Particles, Fields, Gravitation and Cosmology. 2014 Apr 21;89(7).
Aad, G., et al. “Study of heavy-flavor quarks produced in association with top-quark pairs at s =7TeV using the ATLAS detector.” Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 89, no. 7, Apr. 2014. Scopus, doi:10.1103/PhysRevD.89.072012.
Aad G, Abajyan T, Abbott B, Abdallah J, Abdel Khalek S, Abdelalim AA, Abdinov O, Aben R, Abi B, Abolins M, Abouzeid OS, Abramowicz H, Abreu H, Abulaiti Y, Acharya BS, Adamczyk L, Adams DL, Addy TN, Adelman J, Adomeit S, Adye T, Aefsky S, Aguilar-Saavedra JA, Agustoni M, Ahlen SP, Ahles F, Ahmad A, Ahsan M, Aielli G, Åkesson TPA, Akimoto G, Akimov AV, Alam MA, Albert J, Albrand S, Aleksa M, Aleksandrov IN, Alessandria F, Alexa C, Alexander G, Alexandre G, Alexopoulos T, Alhroob M, Aliev M, Alimonti G, Alison J, Allbrooke BMM, Allison LJ, Allport PP, Allwood-Spiers SE, Almond J, Aloisio A, Alon R, Alonso A, Alonso F, Altheimer A, Alvarez Gonzalez B, Alviggi MG, Amako K, Amelung C, Ammosov VV, Amor Dos Santos SP, Amorim A, Amoroso S, Amram N, Anastopoulos C, Ancu LS, Andari N, Andeen T, Anders CF, Anders G, Anderson KJ, Andreazza A, Andrei V, Anduaga XS, Angelidakis S, Anger P, Angerami A, Anghinolfi F, Anisenkov A, Anjos N, Annovi A, Antonaki A, Antonelli M, Antonov A, Antos J, Anulli F, Aoki M, Aperio Bella L, Apolle R, Arabidze G, Aracena I, Arai Y, Arce ATH, Arfaoui S, Arguin JF, Argyropoulos S, Arik E, Arik M, Armbruster AJ. Study of heavy-flavor quarks produced in association with top-quark pairs at s =7TeV using the ATLAS detector. Physical Review D - Particles, Fields, Gravitation and Cosmology. 2014 Apr 21;89(7).

Published In

Physical Review D - Particles, Fields, Gravitation and Cosmology

DOI

10.1103/PhysRevD.89.072012

EISSN

1550-2368

ISSN

1550-7998

Publication Date

April 21, 2014

Volume

89

Issue

7

Related Subject Headings

  • Nuclear & Particles Physics
  • 5107 Particle and high energy physics
  • 5101 Astronomical sciences
  • 4902 Mathematical physics
  • 0206 Quantum Physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences