# Novel Method for the Direct Measurement of the $\tau$ Lepton Dipole Moments

Fu, J. (INFN Sezione di Milano and Università di Milano, 20133 Milano, Italy) ; Giorgi, M. A. (INFN Sezione di Pisa and Università di Pisa, 56127 Pisa, Italy) ; Henry, L. (IFIC, Universitat de València-CSIC, 46980 Valencia, Spain) ; Marangotto, D. (INFN Sezione di Milano and Università di Milano, 20133 Milano, Italy) ; Vidal, F. Martínez (IFIC, Universitat de València-CSIC, 46980 Valencia, Spain) ; Merli, A. (INFN Sezione di Milano and Università di Milano, 20133 Milano, Italy) ; Neri, N. (INFN Sezione di Milano and Università di Milano, 20133 Milano, Italy) ; Vidal, J. Ruiz (IFIC, Universitat de València-CSIC, 46980 Valencia, Spain)

02 July 2019

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 ${D}_{s}^{+}\to {\tau }^{+}{\nu }_{\tau }$ decays, originating 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.

Published in: Physical Review Letters 123 (2019)
Published by: APS
DOI: 10.1103/PhysRevLett.123.011801
License: CC-BY-4.0

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