Fu J, Giorgi M A, Henry L, Marangotto D, Vidal F Martínez, Merli A, Neri N, Vidal J Ruiz
INFN Sezione di Milano and Università di Milano, 20133 Milano, Italy.
INFN Sezione di Pisa and Università di Pisa, 56127 Pisa, Italy.
Phys Rev Lett. 2019 Jul 3;123(1):011801. doi: 10.1103/PhysRevLett.123.011801.
A novel method for the direct measurement of the elusive magnetic and electric dipole moments of the τ lepton is presented. The experimental approach relies on the production of τ^{+} leptons from D_{s}^{+}→τ^{+}ν_{τ} decays, originating in fixed-target collisions at the LHC. A sample of polarized τ^{+} leptons is kinematically selected and subsequently channeled in a bent crystal. The magnetic and electric dipole moments of the τ^{+} 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.
