Coleppa, B.Kumar, M.Kumar, S.Mellado, B.2017-11-172017-11-172017-07Coleppa, B. et al. 2017. Measuring CP nature of top-Higgs couplings at the future LargeHadron electron Collider. Physics Letters B, 770 (2017), pp. 335-3410370-2693 (Print)1873-2445 (Online)http://hdl.handle.net/10539/23419We investigate the sensitivity of top-Higgs coupling by considering the associated vertex as CP phase (ζt) dependent through the process pe−→t¯hνe in the future Large Hadron electron Collider. In particular the decay modes are taken to be h→bb¯ and t¯ → leptonic mode. Several distinct ζt dependent features are demonstrated by considering observables like cross sections, top-quark polarisation, rapidity difference between h and t¯ and different angular asymmetries. Luminosity (L) dependent exclusion limits are obtained for ζt by considering significance based on fiducial cross sections at different σ-levels. For electron and proton beam-energies of 60 GeV and 7 TeV respectively, at L=100 fb−1, the regions above π/5<ζt≤π are excluded at 2σ confidence level, which reflects better sensitivity expected at the Large Hadron Collider. With appropriate error fitting methodology we find that the accuracy of SM top-Higgs coupling could be measured to be κ=1.00±0.17(0.08) at s=1.3(1.8) TeV for an ultimate L=1ab−1.en© 2017 The Author(s). 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 SCOAP3.Electron-proton collisionTop-Higgs couplingTop polarisationPROTON COLLISIONSATLAS DETECTORLHCBOSONDECAYSMASSQUARKSSPINArticle