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Short description.

Physics Motivation: measure the coupling between Z and left handed tau, and the coupling between Z and right handed tau. This is going to be very useful to constrain some of the contact interactions, or to test models such as gauge-Higgs unification. 

Search Channel: e+e- → tau tau, tau → 1-prong / 3-prong, Ecm = 500 GeV.

Detector Benchmark: highly boosted tau reconstruction; in 3-prong channel, interesting to test the limit of track separation; in 1-prong channel, interesting to test PFA performance. 

Main observables.

final observables: gL, gR, (for Ztautau couplings); cross section for e+e- → tau_L tau_R / tau_R tau_L.

intermediate observables: efficiency of tau reconstruction, efficiency of tau decay mode identification, tau polarization

note for circulation

draft  (Aug 23 2019)

draft (Aug 22 2019)

draft (July 26 2019)

updated IDR plot (26 July)


plots for IDR




note draft (8 May)

note draft (27 March 2019)


Daniel Jeans  and Keita Yumino, reviewed by Mikael Berggren


Daniel Jeans, “h->tau tau” [LCWS16, ILD0418]

S. Kawada et al., "A study of the measurement precision of the Higgs boson decaying into tau pairs at the ILC",

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