Abstract
A new method is proposed to reconstruct the neutrinos in the e^+e^-rightarrow Zh process followed by the hrightarrow tau tau decay. With the help of a refined Higgs momentum reconstruction from the recoiling system and the impact parameters, high precision in the determination of the momentum of neutrinos can be achieved. The prospect of measuring the Higgs CP mixing angle with the hrightarrow tau tau decay at e^+e^- colliders is studied with the new method. The analysis is based on a detailed detector simulation of the signal and backgrounds. The fully reconstructed neutrinos and also other visible products from the tau decay are used to build matrix element (ME)-based CP observables. With 5 ab^{-1} of data at E_{text {CM}}=250 GeV, a precision of 2.9^circ can be achieved for the CP mixing angle with three main one-prong decay modes of the taus. The precision is found to be about 35% better than the other methods.
Highlights
To explain the matter–antimatter asymmetry in the currently observed Universe, C and CP symmetry violation is one of the three necessary conditions listed by Sakharov [1]
Using 8 TeV LHC data, ATLAS and CMS have already measured the CP property of the Higgs coupling with the Z boson using the four-lepton decay channel (h → Z Z → ( )( ))
We propose a new method that can be used to reconstruct the momentum of the neutrinos from tau decay at future e+e− machine
Summary
To explain the matter–antimatter asymmetry in the currently observed Universe, C and CP symmetry violation is one of the three necessary conditions listed by Sakharov [1]. We propose a new method that can be used to reconstruct the momentum of the neutrinos from tau decay at future e+e− machine In this method we utilize all the information including mass peaks of all involving particles as well as the impact parameters of each tau decay which will be measured with higher precision at lepton collider than at hadron collider. We find that using the new proposed method we can precisely determine the momentum of the missing neutrinos With these fully reconstructed neutrinos as well as the visible decay products we construct a CP sensitive observable based on event by event matrix element to test the CP structure of the coupling between Higgs and τ leptons. The Higgs momentum reconstruction from the recoil system will be investigated
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call