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In proton-proton collisions at LHC energies, Z and low mass Higgs bosonswould be produced with high and predominantly longitudinal boost with respectto the beam axis. This note describes a new analysis tool devised to handlethis situation in cases when such bosons decay to a pair of tau-leptons. Thetool reconstructs the rest frame of the tau+tau- pair by finding the boost thatminimises the acollinearity between the visible tau decay products. In mostcases this gives a reasonable approximation to the rest frame of the decayingboson. It is shown how the reconstructed rest frame allows for a new method ofmass estimation. Also a considerable gain in sensitivity to helicitycorrelations is obtained by analysing the tau-jets in the reconstructed frameinstead of using the laboratory momenta and energies, particularly when bothtau-leptons decay hadronically.

A Method to Estimate the Boson Mass and to Optimise Sensitivity to Helicity Correlations of tau+tau- Final States