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Search for a multi-Higgs-boson cascade in W+W-bb̄ events with the ATLAS detector in pp collisions at √s = 8 TeV

  • 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
  • et al.
Abstract

A search is presented for new particles in an extension to the Standard Model that includes a heavy Higgs boson (H0), an intermediate charged Higgs-boson pair (H-), and a light Higgs boson (h0). The analysis searches for events involving the production of a single heavy neutral Higgs boson which decays to the charged Higgs boson and a W boson, where the charged Higgs boson subsequently decays into a W boson and the lightest neutral Higgs boson decaying to a bottom-antibottom-quark pair. Such a cascade results in a W-boson pair and a bottom-antibottom-quark pair in the final state. Events with exactly one lepton, missing transverse momentum, and at least four jets are selected from a data sample corresponding to an integrated luminosity of 20.3 fb-1, collected by the ATLAS detector in proton-proton collisions at √s = 8 TeV at the LHC. The data are found to be consistent with Standard Model predictions, and 95% confidence-level upper limits are set on the product of cross section and branching ratio. These limits range from 0.065 to 43 pb as a function of H0and H-masses, with mh0fixed at 125 GeV. © 2014 CERN, for the ATLAS Collaboration.

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