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phys. lett. b744 (2015) 163

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Physics Letters B 744 (2015) 163–183 Contents lists available at ScienceDirect Physics Letters B www.elsevier.com/locate/physletb Search for a CP-odd Higgs  boson decaying  to  Z h  in  pp  collisions at √ s = 8 TeV with the ATLAS detector .ATLAS Collaboration a r t i c l e i n f o a b s t r a c t  Article history: Received 16 February 2015 Received in revised form 19 March 2015 Accepted 24 March 2015 Available online 28 March 2015 Editor: W.-D. Schlatter Keywords: BSM Higgs boson ATLAS A search for a heavy, CP-odd Higgs boson,   A, decaying  into a  Z  boson and a 125 GeV Higgs boson,  h, with the ATLAS  detector  at the LHC is presented.  The search uses proton–proton collision data at a centre-of-mass  energy of  8 TeV corresponding  to an integrated  luminosity of  20.3 fb −1 . Decays  of  CP-even h  bosons to τ τ  or bb  pairs with the  Z  boson decaying to electron or muon pairs are considered,  as well  as h → bb  decays with the  Z  boson decaying  to neutrinos.  No evidence for the production  of  an  A  boson in these channels is found and the 95% confidence level upper limits derived for σ (  gg →  A) × BR (  A → Zh) × BR (h →  f  ¯  f )  are 0.098–0.013 pb for  f  = τ  and 0.57–0.014 pb for  f  = b  in a range of  m  A  = 220–1000 GeV.  The results are combined and interpreted  in the context  of  two-Higgs-doublet  models. Published by Elsevier B.V. This is an open access article under the CC BY  license (http://creativecommons.org/licenses/by/4.0/ ). Funded by SCOAP 3 . 1.  Introduction After the discovery of  a Higgs boson at the LHC in 2012 [1,2], one of  the most important remaining questions  is whether the newly discovered particle is part of  an extended  scalar sector. A CP-odd Higgs boson,  A, appears in many models with an ex- tended scalar sector, e.g. in the case of  the two-Higgs-doublet  model (2HDM)  [3] . The addition of  a second Higgs doublet leads to five Higgs bosons after the electroweak  symmetry breaking.  The phenomenol- ogy of  such a model is very rich and depends on the vacuum expectation values of  the Higgs doublets,  the CP properties of  the Higgs potential  and the values  of  its parameters  and the Yukawa couplings of  the Higgs doublets with the fermions.  In general,  it is possible to accommodate in the model a Higgs boson com- patible to the one discovered at the LHC. In the case where the Higgs potential  of  the 2HDM is CP-conserving,  the Higgs bosons after electroweak  symmetry breaking are two CP-even (h  and H ), one CP-odd (  A) and two charged ( H ± ) Higgs bosons.  Many the- ories beyond the Standard Model (SM) include a second Higgs doublet, such as the minimal supersymmetric  SM (MSSM) [4–8], axion models (e.g. Ref.  [9] ) and baryogenesis  models (e.g. Ref.  [10]). Searches for a CP-odd Higgs boson are reported in Refs.  [11–14]. In this Letter, a search for a heavy CP-odd Higgs boson decaying into a  Z  boson and the ∼125 GeV Higgs boson, h, is described.  E-mail address: [email protected]. The  A →  Zh  decay rate can be dominant for part of  the 2HDM parameter  space, especially for an  A  boson mass, m  A , below the t ¯ t threshold.  In this case, the  A  boson is produced mainly via gluon fusion and its natural width is typically small:   A /m  A O(1%). The search is performed for m  A  in the range 220 to 1000 GeV, reconstructing 1  Z  →  decays (where  = e, µ) with h → bb  or h → τ τ , as well as  Z  → νν  with h → bb. The selected h  boson de- cay modes provide high branching ratios and the possibility to fully reconstruct  the Higgs boson decay kinematics.  The reconstructed  invariant  mass (or transverse  mass) of  the  Z h  pair, employing the measured value of  the h boson mass, m h , to improve  its resolution,  is used to search for a signal. 2. Data and simulated samples The data used in this search were recorded with the ATLAS de- tector in proton–proton  collisions at a centre-of-mass  energy of  8 TeV. The ATLAS detector  is described in detail elsewhere  [15]. The integrated luminosity of  the data sample, selecting only pe- riods where all relevant  detector  subsystems  were operational,  is 20.3 ±  0.6 fb −1 [16]. The data used in the τ τ  and bb  fi- nal states were collected using a combination of  single-electron,  single-muon,  dielectron (ee ) and dimuon (µµ) triggers.  Depending 1 Throughout this Letter,  the notation h → bb, h → ττ ,  Z  → νν  and  Z  →  is used for h → b ¯ b, h → τ + τ − ,  Z  → ν ¯ ν  and   Z  → + − , respectively. http://dx.doi.org/10.1016/j.physletb.2015.03.054 0370-2693/Published by Elsevier B.V. This is an open access article under the CC BY  license (http://creativecommons.org/licenses/by/4.0/ ). Funded by SCOAP 3 .

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