ZhETF, Vol. 147,
p. 258 (February 2015)
(English translation - JETP,
Vol. 120, No. 2,
available online at www.springer.com
POLARIZATION EFFECTS IN RADIATIVE DECAY OF A POLARIZED τ LEPTON
Gakh G.I., Konchatnij M.I., Korchin A.Yu., Merenkov N.P.
Received: July 30, 2014
The polarization effects in the one-meson radiative decay of a polarized τ lepton, τ-→π-γ
uτ, are investigated. The inner bremsstrahlung and structural amplitudes are taken into account. The asymmetry of the differential decay width caused by the τ-lepton polarization and the Stokes parameters of the emitted photon itself are calculated depending on the polarization of the decaying τ lepton. These physical quantities are estimated numerically for an arbitrary direction of the τ lepton polarization 3-vector in the rest frame. The vector and axial-vector form factors describing the structure-dependent part of the decay amplitude are determined using the chiral effective theory with resonances (RχT).