Measurement of CP Violation in Stop Cascade Decays at the LHC

Understand

We study the potential observation at the LHC of CP-violating effects in stop production and subsequent cascade decays, g g -> tilde{t}_i tilde{t}_i, tilde{t}_i -> t tilde{chi}^0_j, tilde{chi}^0_j -> tilde{\chi}^0_1 l^+ l^-, within the Minimal Supersymmetric Standard Model.

• We study T-odd asymmetries based on triple products between the different decay products.
• There may be a large CP asymmetry at the parton level, but there is a significant dilution at the hadronic level after integrating over the parton distribution functions.
• Consequently, even for scenarios where large CP intrinsic asymmetries are expected, the measurable asymmetry is rather small.