https://doi.org/10.1140/epjc/s10052-017-5258-y
Regular Article - Theoretical Physics
Search for CP violation effects in the 
decay with 
colliders
1
Department of Physics, Tsinghua University, Beijing, 100084, China
2
Collaborative Innovation Center of Quantum Matter, Beijing, 100084, China
3
Center for High Energy Physics, Peking University, Beijing, 100084, China
4
Ottawa-Carleton Institute for Physics, Carleton University, 1125 Colonel By Drive, Ottawa, ON, K1S 5B6, Canada
* e-mail: ycwu@physics.carleton.ca
Received:
16
March
2017
Accepted:
25
September
2017
Published online:
23
October
2017
A new method is proposed to reconstruct the neutrinos in the 
process followed by the 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 decay at 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 
of data at 
GeV, a precision of 
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.
© The Author(s), 2017
