2016/08/31 by Gauthier Durieux · 1 citation
Physics and Astronomy · #Amplitude #Asymmetry #Baryon #CP violation #Helicity #Kinematics #Particle physics theoretical and experimental studies #Physics beyond the Standard Model #Quantum Chromodynamics and Particle Interactions #Quantum and Classical Electrodynamics #hep-ex #hep-ph
paper · pdf · doi:10.1007/jhep10(2016)005
published as JHEP 10 (2016) 005 · 2 figures, 16 tables, minor comments and references added in v2 (published version)
openalex publication_date 2016/10/01 · arxiv created 2016/10/05 · arxiv updated 2016/10/06 · openalex created_date 2016/10/14 · openalex updated_date 2026/08/05
Beauty baryons are being observed in large numbers in the LHCb detector. The rich kinematic distributions of their multibody decays are therefore becoming accessible and provide us with new opportunities to search for CP violation. We analyse the angular distributions of some three- and four-body decays of spin-1/2 baryons using the Jacob-Wick helicity formalism. The asymmetries that provide access to small differences of CP-odd phases between decay amplitudes of identical CP-even phases are notably discussed. The understanding gained on processes featuring specific resonant intermediate states allows us to establish which asymmetries are relevant for what purpose. It is for instance shown that some CP-odd angular asymmetries measured by the LHCb collaboration in the Λ b → Λ φ → p π K + K − decay are expected to vanish identically.