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Measurement of the mass difference between top and anti-top quarks in pp collisions at √s=7 TeV using the ATLAS detector

  • Author(s): Aad, G;
  • Abajyan, T;
  • Abbott, B;
  • Abdallah, J;
  • Abdel Khalek, S;
  • 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;
  • Agatonovic-Jovin, T;
  • Aguilar-Saavedra, JA;
  • Agustoni, M;
  • Ahlen, SP;
  • Ahmad, A;
  • Ahmadov, F;
  • Ahsan, M;
  • Aielli, G;
  • Åkesson, TPA;
  • Akimoto, G;
  • Akimov, AV;
  • Alam, MA;
  • Albert, J;
  • Albrand, S;
  • Alconada Verzini, MJ;
  • Aleksa, M;
  • Aleksandrov, IN;
  • Alessandria, F;
  • Alexa, C;
  • Alexander, G;
  • Alexandre, G;
  • Alexopoulos, T;
  • Alhroob, M;
  • Aliev, M;
  • Alimonti, G;
  • Alio, L;
  • 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;
  • Amaral Coutinho, Y;
  • Amelung, C;
  • Ammosov, VV;
  • Amor Dos Santos, SP;
  • Amorim, A;
  • Amoroso, S;
  • Amram, N;
  • Amundsen, G;
  • 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, AV;
  • 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
  • et al.
Abstract

A measurement of the mass difference between top and anti-top quarks is presented. In a 4.7 fb−1 data sample of proton–proton collisions at s=7 TeV recorded with the ATLAS detector at the LHC, events consistent with tt¯ production and decay into a single charged lepton final state are reconstructed. For each event, the mass difference between the top and anti-top quark candidate is calculated. A two b-tag requirement is used in order to reduce the background contribution. A maximum likelihood fit to these per-event mass differences yields Δm≡mt−mt¯=0.67±0.61(stat)±0.41(syst) GeV, consistent with CPT invariance.

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