M_T2 as a probe of CP phase in h → ττ at the LHC

2020/08/25 by Abhaya Kumar Swain, Swain, Abhaya Kumar
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle Detector Development and Performance #Particle physics theoretical and experimental studies

paper · pdf · doi:10.48550/arxiv.2008.11127

openalex publication_date 2020/08/25 · openalex created_date 2022/07/26 · openalex updated_date 2026/07/28

Abstract

We propose to utilize the transverse mass variable M_T2 and it's descendant M_2Cons for constraining the CP admixture of the tau lepton Yukawa coupling at the LHC. We have considered the tau lepton pair produced from the Higgs boson with each tau decays to a charged pion and a neutrino, τ^± → π^± ν_τ. Recently, for this channel, the LHC has employed the impact parameter method to measure the CP mixing angle of tau lepton Yukawa coupling with large uncertainty. The observables we propose here can be measured in the lab frame without the impact parameter measurement and in turn, give a complementary probe of the CP admixture of tau lepton Yukawa. The CP mixing angle, with our method, can be constrained up to 17^∘ (7^∘) with 300 (3000) fb^-1 of integrated luminosity at the 14 LHC.

Related

• Measurement of the CP structure of the Higgs-tau Yukawa coupling
• Probing the CP nature of the Higgs coupling in tth events at the LHC
• Determination of the Higgs CP-mixing angle in the tau decay channels
• Measuring the CP structure of the top Yukawa coupling in ttH events at the LHC
• Measurement of the Higgs Boson Couplings and CP Structure Using Tau\n Leptons at the LHC