Polarization and Spin Effects in Neutralino Production and Decay

1999/03/31 by G. Moortgat-Pick, H. Fraas, A. Bartl +1
Physics and Astronomy · #hep-ph

paper · pdf

published as Eur.Phys.J. C9 (1999) 521-534; Erratum-ibid. C9 (1999) 549 · 28 pages, 14 postscript figures, latex using epsf.sty, typographical errors corrected in eqs.(17),(60),(61),(64) and (65)

arxiv created 1999/07/25 · arxiv updated 2009/11/30

Abstract

We study the production of neutralinos e⁺ e^- ->chi⁰_i χ⁰_j with polarized beams and the subsequent decays chi⁰_i -> chi⁰_k l⁺ l^- and chi⁰_j -> chi⁰_l l⁺ l^-, including the complete spin correlations between production and decay. We present analytical formulae for the differential cross section of the combined process of production and decay of neutralinos. We also allow for complex couplings. The spin correlations have a strong influence on the decay angular distributions and the corresponding forward-backward asymmetries. They are very sensitive to the SUSY parameters and depend strongly on the beam polarizations. We present numerical results for the cross section and the electron forward-backward asymmetry for e⁺ e^- -> chi⁰₁ chi⁰₂, chi⁰₂ -> chi⁰₁ e⁺ e^-. We study the dependence on the parameter M' for various mass splittings between tildee_L and tildee_R and different beam polarizations.

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