Publications [#313315] of Alfred T. Goshaw

Papers Published
  1. 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; Agricola, J; Aguilar-Saavedra, JA; Ahlen, SP; Ahmadov, F; Aielli, G; Akerstedt, H; Åkesson, TPA; 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 et al., Measurement of the branching ratio Γ ( Λ b 0 → ψ ( 2 S ) Λ 0 ) / Γ ( Λ b 0 → J / ψ Λ 0 ) with the ATLAS detector, Physics Letters B, vol. 751 (December, 2015), pp. 63-80 [doi] .

    Abstract:
    © 2015 The Authors. An observation of the Λ b 0 →ψ(2S)Λ 0 decay and a comparison of its branching fraction with that of the Λ b 0 →J/ψΛ 0 decay has been made with the ATLAS detector in proton-proton collisions at s=8 TeV at the LHC using an integrated luminosity of 20.6 fb -1 . The J/ψ and ψ(2S) mesons are reconstructed in their decays to a muon pair, while the Λ 0 → pπ - decay is exploited for the Λ 0 baryon reconstruction. The Λ b 0 baryons are reconstructed with transverse momentum p T > 10 GeV and pseudorapidity |η| < 2.1. The measured branching ratio of the Λ b 0 →ψ(2S)Λ 0 and Λ b 0 J/ψΛ 0 decays is G{cyrillic}(Λ b 0 →ψ(2S)Λ 0 /G{cyrillic}(Λ b 0 J/ψΛ 0 )=0.501±0.033(stat)±0.019(syst), lower than the expectation from the covariant quark model.