TreeLevel: Feynman Diagrams

TreeLevel is a workbench for tree-level particle physics: enter a theory, draw diagrams, and the app computes — Feynman rules, amplitude, |M|², cross sections, decay widths and lifetimes, energy scans. THE THEORY FIRST • The full Standard Model (Feynman gauge, complex CKM matrix), QED, φ⁴, minimal SU(5), and an effective hadron model of 32 particles (nucleons, hyperons, π, K, η, D, B, ρ, ω, φ, J/ψ, Υ…). • Write your own in a readable language, in a few lines: fields, parameters, interaction Lagrangian. Feynman rules are derived, not copied. • Import a UFO folder (FeynRules/MadGraph): the MSSM imports completely, 822 vertices, in a second. DRAW, CHECK • Three tools: vertex, line, select. The canvas reads the diagram along the time axis — a line running backwards in time is an antiparticle. • The inspector tells you at once whether the diagram is consistent, and if not why, suggesting the…