# Novel method for the direct measurement of the tau lepton dipole moments

## TL;DR

This paper introduces a new experimental method to directly measure the magnetic and electric dipole moments of the tau lepton using polarized tau leptons produced at the LHC and channeled through bent crystals.

## Contribution

It presents a novel approach combining fixed-target collisions, polarization selection, and crystal channeling to measure tau lepton dipole moments directly.

## Key findings

- Method enables direct measurement of tau dipole moments.
- Expected sensitivities discussed for the experimental setup.
- Potential to improve understanding of tau lepton properties.

## Abstract

A novel method for the direct measurement of the elusive magnetic and electric dipole moments of the tau lepton is presented. The experimental approach relies on the production of tau+ leptons from Ds+ -> tau+ nu_tau decays, originated in fixed-target collisions at the LHC. A sample of polarized tau+ leptons is kinematically selected and subsequently channeled in a bent crystal. The magnetic and electric dipole moments of the tau+ lepton are measured by determining the rotation of the spin-polarization vector induced by the intense electromagnetic field between crystal atomic planes. The experimental technique is discussed along with the expected sensitivities.