Measurement of CP Violation in Stop Cascade Decays at the LHC

Abstract

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 -> tildeχ^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. High luminosity and precise measurements of masses, branching ratios and CP asymmetries may enable measurements of the CP-violating parameters in cascade decays at the LHC.

Version accepted for publication in EPJC

References in corpus (8)

• An Improved Experimental Limit on the Electric Dipole Moment of the Neutron
• Update of Parton Distributions at NNLO
• Prediction for the Lightest Higgs Boson Mass in the CMSSM using Indirect Experimental Constraints
• A T-odd observable sensitive to CP violating phases in squark decay
• Simulation of Beyond Standard Model Physics in Herwig++
• Combined LHC/ILC analysis of a SUSY scenario with heavy sfermions
• CP asymmetries in scalar bottom quark decays
• CP Violation in Supersymmetric Theories: stop2 -> stop1 tau- tau+

Cited by in corpus (7)

• Proposals for Bottom Quark/Squark Renormalization in the Complex MSSM
• Boosted Semileptonic Tops in Stop Decays
• Normal tau polarisation as a sensitive probe of CP violation in chargino decay
• Momentum reconstruction at the LHC for probing CP-violation in the stop sector
• CP-sensitive spin-spin correlations in neutralino production at the ILC
• Momentum asymmetries as CP violating observables
• Interference Effects, Time Reversal Violation and Search for New Physics in Hadronic Weak Decays