Speaker
Description
Precise measurement of the Electric Dipole Moment (EDM) and anomalous magnetic moment (g-2) of particles is an important test of Beyond Standard Model (BSM) physics. It is generally believed that the tau lepton couples more strongly to BSM due to its large mass, and can be searched for at collider experiments. A new method to approximately reconstruct the neutrinos from the hadronic decays of τ−τ+ pairs produced at e−e+ tau factories is proposed. With a matrix element technique, and the estimated 50 ab−1 of data to be delivered by the Belle-II experiment, a tau EDM search with a 1-σ level precision of |dτ|<2.09×10−19 e⋅cm, and g-2 search with |Δaτ|<1.80×10−5 (1.5% of the SM prediction), can be expected. The new precisions can put an upper bound on the heavy mirror neutrino mass, which is complimentary to the direct search at hadron colliders, or a light scalar with mass at O(1 GeV), which can explain the current muon g-2 anomaly as well. The method in this work offers a new opportunity to search for BSM in current and future tau factories with high precision.
