CP determination for new spin zero mesons by the overlineττ decay mode
Abstract
For spin 0 decay into τ ^{+}τ ^{} yielding an observable lepton pair ℓ _{1}ℓ _{2} from τ ^{±} → ℓ ^{±}ν overlineν, 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 nonrelativistic 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}.
 Publication:

Nuclear Physics B
 Pub Date:
 June 1989
 DOI:
 10.1016/05503213(89)902113
 Bibcode:
 1989NuPhB.320...61D