2024/07/24 by Korchin, A. Yu., Richter-Was, E., Volkotrub, Yu. +1
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2407.17282
The spin correlations in the pair of τ leptons produced in the high-energy proton-proton collisions are studied. The invariant mass of the τ-lepton pair is chosen close to Z-boson mass, in these conditions Z-boson exchange gives the dominant contribution to the Drell-Yan mechanism. The interaction of Z boson with τ lepton, in addition to the Standard Model couplings, can include weak anomalous magnetic and electric dipole moments (or form-factors) of the τ lepton. Dependence of elements of the pp spin-correlation matrix on the weak anomalous moments is determined for various regions of the rapidity of the τ-lepton pair. Based on this calculation, we construct a semi-realistic observable built on the momenta of pions in the τ^∓ → π^∓ ντ and τ^± → ρ^± ντ→ π^± π0 ντ decay channels, and show that this observable can be sensitive to the weak anomalous dipole moments.