Heidelberg 2007 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 407: BSM Theorie II
T 407.3: Vortrag
Donnerstag, 8. März 2007, 17:15–17:30, KIP SR 2.402
CP violation in chargino production and decay into the tau at the ILC — •Anja Marold — Physikalisches Institut der Universität Bonn
The only phase of the Kobayashi-Maskawa matrix within the Standard Model is not sufficient to account for the baryon asymmetry of the universe.
The Minimal Supersymmetric Standard Model offers additional sources for CP-violating phases.
We study CP violation in chargino production e+e−→χi+χj− with longitudinally polarised beams and the ensuing two-body decay of one of the charginos into a tau χi+→τ+ντ. The polarisation of the τ lepton can be analysed by measuring its decay distributions. The transverse polarisation of the tau is sensitive to the phase of the Higgs mixing parameter µ.
We therefore define CP asymmetries of triple products which involve the transverse tau polarisation. We present numerical results of the asymmetries which can be as large as 50% and discuss the importance of initial beam polarisations.