2021 Impact factor 4.991
Particles and Fields
Eur. Phys. J. C 27, 135-143 (2003)
DOI: 10.1140/epjc/s2002-01095-0

Chargino production and decay in photon-photon collisions

T. Mayer, C. Blöchinger, F. Franke and H. Fraas

Institut für Theoretische Physik und Astrophysik, Universität Würzburg, 97074 Würzburg, Germany

(Received: 11 September 2002 / Revised version: 17 October 2002 / Published online: 20 December 2002 )

We discuss the pair production of charginos in collisions of polarized photons, $\gamma\gamma\rightarrow\tilde{\chi}_i^ +\tilde{\chi}_i^ -$ ( i=1,2), and the subsequent leptonic decay of the lighter chargino $\tilde{\chi}_1^ +\rightarrow\tilde{\chi}_1^ 0e^ +\nu_e$ 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 M1 and on the sneutrino mass for a gaugino-like MSSM scenario.

© Società Italiana di Fisica, Springer-Verlag 2003