CP violation in selectron cascade decays e_L -> e X_2^0 -> e X_1^0 mu+ mu-

Abstract

Selectron decays constitute a source of 100% polarised neutralinos, whose helicity is fixed by the charge and "chirality" of the decaying selectron. In SUSY scenarios where the second neutralino X_2^0 has three-body decays, the cascade decay e_L -> e X_2^0 -> e X_1^0 mu+ mu- provides a clean place to study CP violation in the neutralino sector, through the analysis of CP-violating asymmetries involving the X_2^0 spin s and the momenta of the muons. We show that a CP-violating asymmetry in the triple product s . (p_mu- x p_mu+) could be observable at a 800 GeV linear collider provided the gaugino mass M_1 has a large phase at the electroweak scale. We compare our results with X_1^0 X_2^0 production, where a CP asymmetry is also observable within these scenarios.

LaTeX 14 pages, 9 figures. Removed section 5 (which is included in Ref. [33]), improved discussion of backgrounds and added comments and references. To be published in Phys. Lett. B

References in corpus (3)

• SPheno, a program for calculating supersymmetric spectra, SUSY particle decays and SUSY particle production at e+ e- colliders
• Impact of CP phases on stop and sbottom searches
• Testing the Majorana nature of neutralinos in supersymmetric theories

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