Measuring CP Violation in h --> τ+ τ- at Colliders

by Reinard Primulando (Johns Hopkins University)

Tuesday 10 Sept 2013, 15:00 → 16:00 Europe/Berlin

Buildg. 2a, Sem.R. 2 (DESY Hamburg)

Currently the CP phase of the Higgs-tau-tau coupling can be anywhere between 0 degrees (CP even) and 90 degrees (CP odd). I will present a new, ideal observable for measuring the CP phase from the Higgs decay to tau pair followed by the hadronic tau decay: tau+- --> rho+- nu --> pi+- pi0 nu. This observable requires the reconstruction of the internal substructure of decaying taus but does not rely on measuring the impact parameter of tau decays. I will demonstrate that the observable has promising sensitivity at the LHC and superior sensitivity at the ILC compared to previous proposals.