CP determination for new spin zero mesons by the [formula omitted] decay mode

Abstract

For spin- 0 decay into τ +τ − yielding an observable lepton pair ℓ 1ℓ 2 from τ ± → ℓ ±ν ν , the full sequential decay correlation function I( E 1, E 2, cos ψ 12) = S + γ CP D in the Higgs/technipion rest frame is obtained analytically for massless final leptons where ψ 12 is the angle between the ℓ 1 and ℓ 2 momenta. For fixed ψ 12, contour plots of this decay correlation function for M H = 9 GeV show that there is about a 10% difference between γ CP = ±. In the near non-relativistic limit where M H ≅ 2m τ the γ CP signature is a much larger effect, | D/ S| is roughly ∼ 50%. In contrast, the energy correlation function I( E 1, E 2) does not depend on γ CP.