add three decfiles for Bs2tautau background and normalization study
Decay Bs->Ds(3pipi0)Ds(3pipi0) is for background study. No cut on the neutral pi0.
Two decays Bs->Ds*Ds* and Bs->Ds*Ds are for the fit of Bs->Ds(3pi)Ds(3pi) which is the nomalization channel of Bs2tautau. No cut on the neutral pi0/gamma.
Edited by Ya Zhao