Publications [#306272] of Ayana T. Arce

Papers Accepted
  1. Aad, G; Abbott, B; Abdallah, J; Abdel Khalek, S; Abdinov, O; Aben, R; Abi, B; Abolins, M; AbouZeid, O; Abramowicz, H; Abreu, H; Abreu, R; Abulaiti, Y; Acharya, B; Adamczyk, L; Adams, D; Adelman, J; Adomeit, S; Adye, T; Agatonovic-Jovin, T; Aguilar-Saavedra, J; Agustoni, M; Ahlen, S; Ahmadov, F; Aielli, G; Akerstedt, H; Åkesson, T; Akimoto, G; Akimov, A; Alberghi, G; Albert, J; Albrand, S; Alconada Verzini, M; Aleksa, M; Aleksandrov, I; Alexa, C; Alexander, G; Alexandre, G; Alexopoulos, T et al., Search for s -channel single top-quark production in proton–proton collisions at with the ATLAS detector, Physics Letters B, vol. 740 (January, 2015), pp. 118-136 [doi] .

    Abstract:
    © 2014 The Authors.This Letter presents a search at the LHC for s-channel single top-quark production in proton-proton collisions at a centre-of-mass energy of 8 TeV. The analyzed data set was recorded by the ATLAS detector and corresponds to an integrated luminosity of 20.3 fb-1. Selected events contain one charged lepton, large missing transverse momentum and exactly two b-tagged jets. A multivariate event classifier based on boosted decision trees is developed to discriminate s-channel single top-quark events from the main background contributions. The signal extraction is based on a binned maximum-likelihood fit of the output classifier distribution. The analysis leads to an upper limit on the s-channel single top-quark production cross-section of 14.6 pb at the 95% confidence level. The fit gives a cross-section of σs = 5.0 ± 4.3 pb, consistent with the Standard Model expectation.