Probing CP violation in $h\to {\tau }^{-}{\tau }^{+}$ at the LHC

Abstract

We propose a novel method to reconstruct event by event the full kinematics of the cascade decay process, $h\to {\tau }^{+}{\tau }^{-}\to ({\pi }^{+}\bar{\nu })({\pi }^{-}\nu )$, which allows us to measure the ${\tau }^{+}{\tau }^{-}$ spin correlation, a measure of the CP property of the Higgs boson. By noting that the ${\tau }^{\pm }$ momenta lie on the plane spanned by the accurately measured impact parameter and momentum vectors of charged pions, we can obtain the most likely momenta of the two missing neutrinos by using the probability distribution functions of the $\met$ vector and the location of the primary vertex. A simple detector level simulation shows an excellent agreement between the reconstructed and the true kinematics, both in the ${\tau }^{+}{\tau }^{-}$ and the ${\pi }^{+}{\pi }^{-}$ rest frames. The method can be tested in $Z\to {\tau }^{+}{\tau }^{-}$ events, which should exhibit no correlation.

arXiv comment5 pages, 4 figures; v2: accepted version by PRL. Some typos are corrected, texts and figures are also improved

References in corpus (54)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• 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
• A Brief Introduction to PYTHIA 8.1
• FastJet user manual
• DELPHES 3, A modular framework for fast simulation of a generic collider experiment
• Vector boson production at hadron colliders: a fully exclusive QCD calculation at NNLO
• Evidence for the spin-0 nature of the Higgs boson using ATLAS data
• Measurement of the properties of a Higgs boson in the four-lepton final state
• Study of the mass and spin-parity of the Higgs boson candidate via its decays to Z boson pairs
• Determining the Structure of Higgs Couplings at the LHC
• Evidence for the 125 GeV Higgs boson decaying to a pair of tau leptons
• Evidence for the Higgs-boson Yukawa coupling to tau leptons with the ATLAS detector
• A framework for Higgs characterisation
• Searching for H --> tau tau in weak boson fusion at the LHC
• A New Mass Reconstruction Technique for Resonances Decaying to di-tau
• Missing transverse energy performance of the CMS detector
• Constraints on CP-violating Higgs couplings to the third generation
• Higgs characterisation at NLO in QCD: CP properties of the top-quark Yukawa interaction
• The ATLAS Inner Detector commissioning and calibration
• Disentangling Higgs-Top Couplings in Associated Production
• Impact of a CP Violating Higgs: from LHC to Baryogenesis
• Boosting the Direct CP Measurement of the Higgs-Top Coupling
• Lab-frame observables for probing the top-Higgs interaction
• Measuring CP Violation in $h\to {\tau }^{+}{\tau }^{-}$ at Colliders
• Determining the CP parity of Higgs bosons at the LHC in their tau decay channels
• Constraining CP-violating Higgs Sectors at the LHC using gluon fusion
• 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
• Measuring the Higgs boson's parity using tau --> rho nu
• Measuring Higgs CP and couplings with hadronic event shapes
• Higgs CP properties using the tau decay modes at the ILC
• Exploring the Anomalous Higgs-top Couplings
• TauDecay: a library to simulate polarized tau decays via FeynRules and MadGraph5
• Probing CP Violation in $h\to \gamma \gamma$ with Converted Photons
• New Observables for CP Violation in Higgs Decays
• Pseudoscalar top-Higgs coupling: Exploration of $\mathrm{CP}$-odd observables to resolve the sign ambiguity
• Probing the Higgs Couplings to Photons in $h\to 4\ell$ at the LHC
• Azimuthal Angle Correlations for Higgs Boson plus Multi-Jet Events
• Measuring the Higgs boson parity at a Linear Collider using the tau impact parameter and tau --> rho nu decay
• Pseudoscalar Higgs Bosons at the LHC: Production and Decays into Electroweak Gauge Bosons Revisited
• Enhancing the ttH signal through top-quark spin polarization effects at the LHC
• Probing Higgs Boson $CP$ Properties with $t\bar{t}H$ at the LHC and the 100 TeV $pp$ Collider
• Polarization effects in the Higgs boson decay to gamma Z and test of CP and CPT symmetries
• Mass reconstruction with $M_2$ under constraint in semi-invisible production at a hadron collider
• Tau lepton reconstruction at collider experiments using impact parameters
• Reconstructing semi-invisible events in resonant tau pair production from Higgs
• Constrained $\sqrt{{\hat{S}}_{min}}$ and reconstructing with semi-invisible production at hadron colliders
• CP violation in $h\to \tau \tau$ and LFV $h\to \mu \tau$
• CP violation in Higgs decays
• Yukawa sector for LFV in $h\to \mu \tau$ and CP violation in $h\to \tau \tau$
• Higgs boson CP-properties of the gluonic contributions in Higgs plus three jet production via gluon fusion at the LHC

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• Measuring the CP state of tau lepton pairs from Higgs decay at the ILC
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• CP-violating Higgs Di-tau Decays: Baryogenesis and Higgs Factories
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• Search for CP violation effects in the $h\to \tau \tau$ decay with $e^{+}{e}^{-}$ colliders
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