Measurement of CP violation in stop cascade decays at the LHC

2008/09/30 by J. Ellis, F. Moortgat, G. Moortgat-Pick +2 · 1 citation
Computer Science · Physics and Astronomy · #Asymmetry #CP violation #Cascade #Computational Physics and Python Applications #Hadron #Large Hadron Collider #Particle physics theoretical and experimental studies #Parton #Quantum Chromodynamics and Particle Interactions #Standard Model (mathematical formulation) #hep-ph

paper · pdf · doi:10.1140/epjc/s10052-009-0964-8

published as Eur.Phys.J.C60:633-651,2009 · Version accepted for publication in EPJC

arxiv created 2009/02/20 · openalex publication_date 2009/03/11 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05

Abstract

We study the potential observation at the LHC of CP-violating effects in stop production and subsequent cascade decays, g g -> tildet_i tildet_i, tildet_i -> t tildechi⁰_j, tildechi⁰_j -> tildeχ⁰₁ 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.

Citations

• Review of Particle Physics
• CPviolation in supersymmetric theories:t˜2→t˜1τ−τ+
• Simulation of beyond standard model physics in Herwig++
• Reconciling largeCP-violating phases with bounds on the electric dipole moments in the MSSM
• An Improved Experimental Limit on the Electric Dipole Moment of the Neutron

Cited by

• CP violating asymmetry in stop decay into bottom and chargino