Measuring the CP property of Higgs coupling to tau leptons in the VBF channel at the LHC

2016/12/01 by Tao Han, S. Mukhopadhyay, Satyanarayan Mukhopadhyay +2 · 16 citations
Physics and Astronomy · #Boson #CP violation #Coupling (piping) #Dark Matter and Cosmic Phenomena #Electron #Gluon #Higgs boson #High-Energy Particle Collisions Research #Large Hadron Collider #Lepton #Luminosity #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Quantum mechanics #Quark #Standard Model (mathematical formulation) #hep-ex #hep-ph

paper · pdf · doi:10.1007/jhep05(2017)128

published in Journal of High Energy Physics 2017(5) (Springer Nature) · 19 pages, 5 figures, 2 tables

arxiv created 2016/12/01 · openalex publication_date 2017/05/01 · arxiv updated 2017/05/26 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

We study the prospects of measuring the CP property of the Higgs (h) coupling to tau leptons using the vector boson fusion (VBF) production mode at the high-luminosity LHC. Utilizing the previously proposed angle between the planes spanned by the momentum vectors of the (π + π 0) and (π − π 0) pairs originating in τ ± decays as the CP-odd observable, we perform a detailed Monte Carlo analysis, taking into account the relevant standard model backgrounds, as well as detector resolution effects. We find that excluding a pure C O(400 fb^-1) luminosity at the 14 TeV LHC, and values of the CP-mixing angle larger than about 25° can be excluded at 95% confidence level using 3 ab−1 data. It is observed that the uncertainty in the angular resolution of the neutral pion momenta does not constitute a significant hurdle. Achieving a signal to background ratio (S/B) close to one, while keeping a high enough signal yield required to study the angular distributions selects out VBF as a promising mode to probe the CP nature of the hτ τ coupling, with gluon fusion suffering from a low S/B, and the W ± h/Zh mode (with leptonically decaying W ± /Z) having a much smaller signal rate.

Citations

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Vector Boson Production at Hadron Colliders: A Fully Exclusive QCD Calculation at Next-to-Next-to-Leading Order
• Determining theCPParity of Higgs Bosons via TheirτDecay Channels at the Large Hadron Collider
• Production, decay, and polarization of excited heavy hadrons
• The anti-ktjet clustering algorithm
• Measurement of the properties of a Higgs boson in the four-lepton final state
• Evidence for the Higgs-boson Yukawa coupling to tau leptons with the ATLAS detector
• Evidence for the spin-0 nature of the Higgs boson using ATLAS data
• Constraints on the spin-parity and anomalousHVVcouplings of the Higgs boson in proton collisions at 7 and 8 TeV
• Parton distributions for the LHC run II
• FeynRules – Feynman rules made easy
• FeynRules 2.0 — A complete toolbox for tree-level phenomenology
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Dispelling the N3 myth for the kt jet-finder
• Review of Particle Physics
• Review of Multibody Charm Analyses
• Physics at a 100 TeV pp collider: Standard Model processes