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Search for light top squark pair production in final states with leptons and b-jets with the ATLAS detector in √s=7 TeV proton–proton collisions

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: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
March 13, 2013

The results of a search for pair production of light top squarks are presented, using 4.7 fb−1 of s=7 TeV proton–proton collisions collected with the ATLAS detector at the Large Hadron Collider. This search targets top squarks with masses similar to, or lighter than, the top quark mass. Final states containing exclusively one or two leptons (e,μ), large missing transverse momentum, light-flavour jets and b-jets are used to reconstruct the top squark pair system. Event-based mass scale variables are used to separate the signal from a large tt¯ background. No excess over the Standard Model expectations is found. The results are interpreted in the framework of the Minimal Supersymmetric Standard Model, assuming the top squark decays exclusively to a chargino and a b-quark, while requiring different mass relationships between the Supersymmetric particles in the decay chain. Light top squarks with masses between 123–167 GeV are excluded for neutralino masses around 55 GeV.

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Published In

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

DOI

ISSN

0370-2693

Publication Date

March 13, 2013

Volume

720

Issue

1-3

Start / End Page

13 / 31

Related Subject Headings

  • Nuclear & Particles Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences
  • 0105 Mathematical Physics
 

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Aad, G., Abajyan, T., Abbott, B., Abdallah, J., Abdel Khalek, S., Abdelalim, A. A., … Arik, M. (2013). Search for light top squark pair production in final states with leptons and b-jets with the ATLAS detector in √s=7 TeV proton–proton collisions. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 720(1–3), 13–31. https://doi.org/10.1016/j.physletb.2013.01.049
Aad, G., T. Abajyan, B. Abbott, J. Abdallah, S. Abdel Khalek, A. A. Abdelalim, O. Abdinov, et al. “Search for light top squark pair production in final states with leptons and b-jets with the ATLAS detector in √s=7 TeV proton–proton collisions.” Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 720, no. 1–3 (March 13, 2013): 13–31. https://doi.org/10.1016/j.physletb.2013.01.049.
Aad G, Abajyan T, Abbott B, Abdallah J, Abdel Khalek S, Abdelalim AA, et al. Search for light top squark pair production in final states with leptons and b-jets with the ATLAS detector in √s=7 TeV proton–proton collisions. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2013 Mar 13;720(1–3):13–31.
Aad, G., et al. “Search for light top squark pair production in final states with leptons and b-jets with the ATLAS detector in √s=7 TeV proton–proton collisions.” Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 720, no. 1–3, Mar. 2013, pp. 13–31. Scopus, doi:10.1016/j.physletb.2013.01.049.
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, Acerbi E, Acharya BS, Adamczyk L, Adams DL, Addy TN, Adelman J, Adomeit S, Adragna P, Adye T, Aefsky S, Aguilar-Saavedra JA, Agustoni M, Aharrouche M, Ahlen SP, Ahles F, Ahmad A, Ahsan M, Aielli G, Akdogan T, Åkesson TPA, Akimoto G, Akimov AV, Alam MS, 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, Allport PP, Allwood-Spiers SE, Almond J, Aloisio A, Alon R, Alonso A, Alonso F, Alvarez Gonzalez B, Alviggi MG, Amako K, Amelung C, Ammosov VV, Amor Dos Santos SP, Amorim A, Amram N, Anastopoulos C, Ancu LS, Andari N, Andeen T, Anders CF, Anders G, Anderson KJ, Andreazza A, Andrei V, Andrieux ML, Anduaga XS, Anger P, Angerami A, Anghinolfi F, Anisenkov A, Anjos N, Annovi A, Antonaki A, Antonelli M, Antonov A, Antos J, Anulli F, Aoki M, Aoun S, Aperio Bella L, Apolle R, Arabidze G, Aracena I, Arai Y, Arce ATH, Arfaoui S, Arguin JF, Arik E, Arik M. Search for light top squark pair production in final states with leptons and b-jets with the ATLAS detector in √s=7 TeV proton–proton collisions. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2013 Mar 13;720(1–3):13–31.
Journal cover image

Published In

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

DOI

ISSN

0370-2693

Publication Date

March 13, 2013

Volume

720

Issue

1-3

Start / End Page

13 / 31

Related Subject Headings

  • Nuclear & Particles Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences
  • 0105 Mathematical Physics