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Measurement of the parity-violating asymmetry parameter αb and the helicity amplitudes for the decay Λb0 →j /ψ Λ0 with 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;
  • Adelman, J;
  • Adomeit, S;
  • Adye, T;
  • Agatonovic-Jovin, T;
  • Aguilar-Saavedra, JA;
  • Agustoni, M;
  • Ahlen, SP;
  • Ahmad, A;
  • Ahmadov, F;
  • Aielli, G;
  • Åkesson, TPA;
  • Akimoto, G;
  • Akimov, AV;
  • Albert, J;
  • Albrand, S;
  • Alconada Verzini, MJ;
  • Aleksa, M;
  • Aleksandrov, IN;
  • Alexa, C;
  • Alexander, G;
  • Alexandre, G;
  • Alexopoulos, T;
  • Alhroob, 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;
  • Alpigiani, C;
  • Altheimer, A;
  • Alvarez Gonzalez, B;
  • Alviggi, MG;
  • Amako, K;
  • Amaral Coutinho, Y;
  • Amelung, C;
  • Amidei, D;
  • 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;
  • Araque, JP;
  • Arce, ATH;
  • Arguin, JF;
  • Argyropoulos, S;
  • Arik, M;
  • Armbruster, AJ;
  • Arnaez, O
  • et al.
Abstract

A measurement of the parity-violating decay asymmetry parameter, αb, and the helicity amplitudes for the decay Λb0→J/ψ(μ+μ-)Λ0(pπ-) is reported. The analysis is based on 1400 Λb0 and Λ¯b0 baryons selected in 4.6 fb-1 of proton-proton collision data with a center-of-mass energy of 7 TeV recorded by the ATLAS experiment at the LHC. By combining the Λb0 and Λ¯b0 samples under the assumption of CP conservation, the value of αb is measured to be 0.30±0.16(stat)±0.06(syst). This measurement provides a test of theoretical models based on perturbative QCD or heavy-quark effective theory.

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