Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-05-29
Nucl.Phys. B668 (2003) 364-384; Erratum-ibid. B701 (2004) 405-406
Physics
High Energy Physics
High Energy Physics - Phenomenology
23 pages, 35 figures; compile errors corrected; notation errors in Eq.(30) and (31) corrected, typo error in Eq.(40) corrected
Scientific paper
10.1016/S0550-3213(03)00575-3
We investigate the spin polarization of \tau^{\pm} leptons produced in \nu_{\tau} and \bar{\nu}_{\tau} nucleon scattering via charged currents. Quasi-elastic scattering, \Delta resonance production and deep inelastic scattering processes are studied. The polarization information is essential for measuring the \tau^{\pm} appearance rate in long baseline neutrino oscillation experiments, because the decay particle distributions depend crucially on the \tau^{\pm} spin. In this article, we calculate the spin density matrix of each process and estimate the spin polarization vector in medium and high neutrino energy interactions. We find that the produced \tau^{\pm}'s have high degree of polarization, and their spin direction depends non-trivially on the energy and the scattering angle of \tau^{\pm} in the laboratory frame.
Hagiwara Kaoru
Mawatari Kentarou
Yokoya Hiroshi
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