Scalar mass dependence of angular variables in $t\bar{t}\varphi$ production

Abstract

In this paper we explore CP discrimination in the associated production of top-quark pairs ($t\bar{t}$) with a generic scalar boson ($\varphi$) at the LHC. We probe the CP-sensitivity of several observables for a varying scalar boson mass and CP-number, either CP-even ($\varphi =H$) or CP-odd ($\varphi =A$), using dileptonic final states of the $t\bar{t}\varphi$ system, with $\varphi \to b\bar{b}$. We show that CP-searches are virtually impossible for $\varphi$ boson masses above a few hundred GeV in this channel. A full phenomenological analysis was performed, using Standard Model background and signal events generated with MadGraph5 MC@NLO and reconstructed using a kinematic fit. The most sensitive CP-observables are used to compute Confidence Levels (CLs), as a function of luminosity, for the exclusion of different signal hypotheses with scalar and pseudoscalar boson masses that range from $m_{\varphi }$ = 40 GeV up to 200 GeV. We finalize by analysing the impact of a measurement (or limit) of the CP-violating angle in the parameter space of a complex two-Higgs doublet model known as the C2HDM.

arXiv comment28 pages, 19 figures

References in corpus (29)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• The anti-k_t jet clustering algorithm
• FastJet user manual
• DELPHES 3, A modular framework for fast simulation of a generic collider experiment
• MadGraph 5 : Going Beyond
• Parton distributions with LHC data
• Confidence Level Computation for Combining Searches with Small Statistics
• Automatic spin-entangled decays of heavy resonances in Monte Carlo simulations
• MadAnalysis 5, a user-friendly framework for collider phenomenology
• A framework for Higgs characterisation
• Higgs characterisation at NLO in QCD: CP properties of the top-quark Yukawa interaction
• Associated production of a top-quark pair with vector bosons at NLO in QCD: impact on $t\bar{t}H$ searches at the LHC
• Top-quark pair hadroproduction in association with a heavy boson at NLO+NNLL including EW corrections
• CP violation in top quark production at the LHC and Two-Higgs-Doublet Models
• $h\to Z\gamma$ in the complex two Higgs doublet model
• Phenomenological Comparison of Models with Extended Higgs Sectors
• Determing the CP Nature of a Neutral Higgs Boson at the LHC
• Determining the CP parity of Higgs bosons at the LHC in their tau decay channels
• Associated production of a top quark pair with a heavy electroweak gauge boson at NLO+NNLL accuracy
• Confronting Higgcision with Electric Dipole Moments
• Determining the CP parity of Higgs bosons at the LHC in the $\tau$ to 1-prong decay channels
• Associated production of a top pair and a Higgs boson beyond NLO
• The C2HDM revisited
• CP violation in charged Higgs production and decays in the Complex Two Higgs Doublet Model
• Determination of the Higgs CP mixing angle in the tau decay channels at the LHC including the Drell-Yan background
• Pseudoscalar top-Higgs coupling: Exploration of $\mathrm{CP}$-odd observables to resolve the sign ambiguity
• NNLL resummation for the associated production of a top pair and a Higgs boson at the LHC

Cited by in corpus (6)

• CP-violation, Asymmetries and Interferences in $t\bar{t}\varphi$
• Renormalization of the C2HDM with FeynMaster 2
• Light Higgs searches in $t\bar{t}\varphi$ production at the LHC
• Testing CP-violation in a Heavy Higgs Sector at CLIC
• Asymmetries in invisible Dark Matter mediator production associated with $t\bar{t}$ final states
• HEP-Frame: an Efficient Tool for Big Data Applications at the LHC