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A search for tt resonances using lepton-plus-jets events in proton-proton collisions at √s=8 TeV with the ATLAS detector

Publication ,  Journal Article
The ATLAS collaboration; Aad, G; Abbott, B; Abdallah, J; Abdinov, O; Aben, R; Abolins, M; AbouZeid, OS; Abramowicz, H; Abreu, H; Abreu, R ...
Published in: Journal of High Energy Physics
August 14, 2015
Published version (DOI)

Abstract: A search for new particles that decay into top quark pairs is reported. The search is performed with the ATLAS experiment at the LHC using an integrated luminosity of 20.3 fb−1 of proton-proton collision data collected at a centre-of-mass energy of √s=8 TeV. The lepton-plus-jets final state is used, where the top pair decays to W+bW−b¯, with one W boson decaying leptonically and the other hadronically. The invariant mass spectrum of top quark pairs is examined for local excesses or deficits that are inconsistent with the Standard Model predictions. No evidence for a top quark pair resonance is found, and 95% confidence-level limits on the production rate are determined for massive states in benchmark models. The upper limits on the cross-section times branching ratio of a narrow Z′ boson decaying to top pairs range from 4.2 pb to 0.03 pb for resonance masses from 0.4 TeV to 3.0 TeV. A narrow leptophobic topcolour Z′ boson with mass below 1.8 TeV is excluded. Upper limits are set on the cross-section times branching ratio for a broad colour-octet resonance with Γ/m = 15% decaying to tt¯. These range from 4.8 pb to 0.03 pb for masses from 0.4 TeV to 3.0 TeV. A Kaluza-Klein excitation of the gluon in a Randall-Sundrum model is excluded for masses below 2.2 TeV.

Duke Scholars

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

Journal of High Energy Physics

DOI

10.1007/JHEP08(2015)148

EISSN

1029-8479

Publication Date

August 14, 2015

Volume

2015

Issue

8

Related Subject Headings

  • Nuclear & Particles Physics
  • 5107 Particle and high energy physics
  • 5106 Nuclear and plasma physics
  • 4902 Mathematical physics
  • 0206 Quantum Physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0105 Mathematical Physics
 

Citation

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The ATLAS collaboration, ., Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Aben, R., … Arslan, O. (2015). A search for tt resonances using lepton-plus-jets events in proton-proton collisions at √s=8 TeV with the ATLAS detector. Journal of High Energy Physics, 2015(8). https://doi.org/10.1007/JHEP08(2015)148
The ATLAS collaboration, L., G. Aad, B. Abbott, J. Abdallah, O. Abdinov, R. Aben, M. Abolins, et al. “A search for tt resonances using lepton-plus-jets events in proton-proton collisions at √s=8 TeV with the ATLAS detector.” Journal of High Energy Physics 2015, no. 8 (August 14, 2015). https://doi.org/10.1007/JHEP08(2015)148.
The ATLAS collaboration, Aad G, Abbott B, Abdallah J, Abdinov O, Aben R, et al. A search for tt resonances using lepton-plus-jets events in proton-proton collisions at √s=8 TeV with the ATLAS detector. Journal of High Energy Physics. 2015 Aug 14;2015(8).
The ATLAS collaboration, L., et al. “A search for tt resonances using lepton-plus-jets events in proton-proton collisions at √s=8 TeV with the ATLAS detector.” Journal of High Energy Physics, vol. 2015, no. 8, Aug. 2015. Scopus, doi:10.1007/JHEP08(2015)148.
The ATLAS collaboration, Aad G, Abbott B, Abdallah J, Abdinov O, Aben R, Abolins M, AbouZeid OS, Abramowicz H, Abreu H, Abreu R, Abulaiti Y, Acharya BS, Adamczyk L, Adams DL, Adelman J, Adomeit S, Adye T, Affolder AA, Agatonovic-Jovin T, Aguilar-Saavedra JA, Ahlen SP, Ahmadov F, Aielli G, Akerstedt H, Åkesson TPA, Akimoto G, Akimov AV, Alberghi GL, Albert J, Albrand S, Alconada Verzini MJ, Aleksa M, Aleksandrov IN, Alexa C, Alexander G, Alexopoulos T, Alhroob M, Alimonti G, Alio L, Alison J, Alkire SP, Allbrooke BMM, Allport PP, Aloisio A, Alonso A, Alonso F, Alpigiani C, Altheimer A, Alvarez Gonzalez B, Álvarez Piqueras D, Alviggi MG, Amadio BT, Amako K, Amaral Coutinho Y, Amelung C, Amidei D, Amor Dos Santos SP, Amorim A, Amoroso S, Amram N, Amundsen G, Anastopoulos C, Ancu LS, Andari N, Andeen T, Anders CF, Anders G, Anders JK, Anderson KJ, Andreazza A, Andrei V, Angelidakis S, Angelozzi I, Anger P, Angerami A, Anghinolfi F, Anisenkov AV, Anjos N, Annovi A, Antonelli M, Antonov A, Antos J, Anulli F, Aoki M, Aperio Bella L, Arabidze G, Arai Y, Araque JP, Arce ATH, Arduh FA, Arguin JF, Argyropoulos S, Arik M, Armbruster AJ, Arnaez O, Arnal V, Arnold H, Arratia M, Arslan O. A search for tt resonances using lepton-plus-jets events in proton-proton collisions at √s=8 TeV with the ATLAS detector. Journal of High Energy Physics. 2015 Aug 14;2015(8).
Journal cover image

Published In

Journal of High Energy Physics

DOI

10.1007/JHEP08(2015)148

EISSN

1029-8479

Publication Date

August 14, 2015

Volume

2015

Issue

8

Related Subject Headings

  • Nuclear & Particles Physics
  • 5107 Particle and high energy physics
  • 5106 Nuclear and plasma physics
  • 4902 Mathematical physics
  • 0206 Quantum Physics
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0105 Mathematical Physics