CP asymmetries with Longitudinal and Transverse Beam Polarizations in Neutralino Production and Decay into the Z^0 Boson at the ILC

Abstract

We study neutralino production at the linear collider with the subsequent two-body decays ~chi^0_i -> ~chi^0_n Z^0 and Z^0 -> l^+ l^-, with l=e, mu, tau, or Z^0 -> q q- with q=c,b. We show that transverse electron and positron beam polarizations allow the definition of unique CP observables. These are azimuthal asymmetries in the distributions of the final leptons or quarks. We calculate these CP asymmetries and the cross sections in the Minimal Supersymmetric Standard Model with complex higgsino and gaugino parameters mu and M_1. For final quark pairs, we find CP asymmetries as large as 30%. We discuss the significances for observing the CP asymmetries at the International Linear Collider (ILC). Finally we compare the CP asymmetries with those asymmetries which require unpolarized and/or longitudinally polarized beams only.

25pp; minor changes, published version

References in corpus (7)

• SFITTER: SUSY Parameter Analysis at LHC and LC
• Narrow-width approximation limitations
• Phases and CP Violation in SUSY
• Neutralino Production and Decay at an e^+e^- Linear Collider with Transversely Polarized Beams
• CP sensitive observables in e+e- -> neutralino_i neutralino_j and neutralino decay into the Z boson
• Selectron production at an e-e- linear collider with transversely polarized beams
• CP Violation in Production and Decay of Supersymmetric Particles

Cited by in corpus (4)

• CP violation at one loop in the polarization-independent chargino production in e+e- collisions
• SUSY CP phases and asymmetries at colliders
• CP-sensitive spin-spin correlations in neutralino production at the ILC
• CP Violation in SUSY Particle Production and Decay