Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-09-10
Eur.Phys.J.C27:135-143,2003
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages, 15 figures, version to be published in Eur. Phys. J. C
Scientific paper
10.1140/epjc/s2002-01095-0
We discuss the pair production of charginos in collisions of polarized photons $\gamma\gamma \to \tilde{\chi}_i^+ \tilde{\chi}_i^-$, ($i=1,2$) and the subsequent leptonic decay of the lighter chargino $\tilde{\chi}_1^+ \to \tilde{\chi}_1^0 e^+ \nu_e$ including the complete spin correlations. Analytical formulae are given for the polarization and the spin-spin correlations of the charginos. Since the production is a pure QED process the decay dynamics can be studied separately. For high energy photons from Compton backscattering of polarized laser pulses off polarized electron beams numerical results are presented for the cross section, the angular distribution and the forward-backward asymmetry of the decay positron. Finally we study the dependence on the gaugino mass parameter $M_1$ and on the sneutrino mass for a gaugino-like MSSM scenario.
Bloechinger C.
Fraas Hans
Franke F.
Mayer Tobias
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