Exploring CP violation in $H\to {\tau }^{+}{\tau }^{-}\gamma$

Abstract

We propose a method of measuring the CP-odd part of the Yukawa interaction of Higgs boson and $\tau$ leptons by observing the forward-backward asymmetry in the decay $H\to {\tau }^{+}{\tau }^{-}\gamma$. The source of such asymmetry is the interference of the CP-even loop-level contribution coming from $H\to Z\gamma \to {\tau }^{+}{\tau }^{-}\gamma$ decay channel with the contribution from tree-level CP-odd Yukawa interaction. We find that the CP violating effect is maximum when the invariant mass of the ${\tau }^{+}{\tau }^{-}$ pair is equal to the mass of the $Z$ boson. We propose and utilise various Dalitz plot asymmetries to quantify the maximal size of the asymmetry and perform Monte Carlo simulations to study the feasibility of measuring it in the high luminosity phase of the Large Hadron Collider (HL-LHC).

arXiv comment11 pages, 9 figures, For the published version see the Journal reference and DOI

References in corpus (40)

• 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
• New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
• DELPHES 3, A modular framework for fast simulation of a generic collider experiment
• A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX
• A New Method for Combining NLO QCD with Shower Monte Carlo Algorithms
• Matching NLO QCD computations and parton shower simulations
• High-precision QCD at hadron colliders: electroweak gauge boson rapidity distributions at NNLO
• Standard Model CP-violation and Baryon asymmetry
• Standard Model CP-violation and Baryon asymmetry Part II: Finite Temperature
• NLO Higgs boson production plus one and two jets using the POWHEG BOX, MadGraph4 and MCFM
• Measuring CP Violation in $h\to {\tau }^{+}{\tau }^{-}$ at Colliders
• Electroweak Baryogenesis and the Standard Model Effective Field Theory
• Determining the CP parity of Higgs bosons at the LHC in their tau decay channels
• On a CP Anisotropy Measurement in the Dalitz Plot
• How to pin down the CP quantum numbers of a Higgs boson in its tau decays at the LHC
• Determining the CP parity of Higgs bosons at the LHC in the $\tau$ to 1-prong decay channels
• A search for the $Z\gamma$ decay mode of the Higgs boson in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• Test of CP invariance in vector-boson fusion production of the Higgs boson in the $H\to \tau \tau$ channel in proton$-$proton collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• The role of leptons in electroweak baryogenesis
• Higgs CP properties using the tau decay modes at the ILC
• Higgs-photon associated production at $e\bar{e}$ colliders
• Search for CP Violation in Neutral D Meson Cabibbo-suppressed Three-body Decays
• New Observables for CP Violation in Higgs Decays
• Analysis of the CP structure of the Yukawa coupling between the Higgs boson and $\tau$ leptons in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• $CP$ violation from $\tau$, $t$ and $b$ dimension-6 Yukawa couplings -- interplay of baryogenesis, EDM and Higgs physics
• Constraining the CP structure of Higgs-fermion couplings with a global LHC fit, the electron EDM and baryogenesis
• Radiative Higgs Boson Decays H -> f fbar gamma
• Observing CP Violation in Many-Body Decays
• Measurements of Higgs boson production cross-sections in the $H\to {\tau }^{+}{\tau }^{-}$ decay channel in $pp$ collisions at $\sqrt{s}=13\text{TeV}$ with the ATLAS detector
• Search for CP violation in $D^0\to {\pi }^{-}{\pi }^{+}{\pi }^0$ decays with the energy test
• Search for dark matter in events with missing transverse momentum and a Higgs boson decaying into two photons in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Search for Higgs boson decays to a Z boson and a photon in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Angular distribution and forward-backward asymmetry of the Higgs-boson decay to photon and lepton pair
• Probing CP violation in $h\to {\tau }^{-}{\tau }^{+}$ at the LHC
• A New bound on CP Violation in the $\tau$ Lepton Yukawa Coupling and electroweak baryogenesis
• Constraints on anomalous Higgs boson couplings to vector bosons and fermions from the production of Higgs bosons using the $\tau \tau$ final state
• Earth mover's distance as a measure of CP violation
• Search for $CP$ violation in the phase space of $D^0\to {\pi }^{-}{\pi }^{+}{\pi }^0$ decays with the energy test