Light front quantization: Difference between revisions

Revision as of 08:47, 27 December 2023

Revision as of 22:25, 26 June 2024

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The [[Gauge theory|gauge]]-invariant [[meson]] and [[baryon]] distribution amplitudes which control hard exclusive and direct reactions are the [[Quark model|valence]] light-front wave functions integrated over transverse momentum at fixed <math>x_i= {k^+ _i/ P^+}</math>. The "ERBL" evolution<ref name="Lepage:1980fj" /><ref name="Efremov:1979qk" /> of distribution amplitudes and the factorization theorems for hard exclusive processes can be derived most easily using light-front methods. Given the frame-independent light-front wave functions, one can compute a large range of hadronic observables including generalized parton distributions, Wigner distributions, etc. For example, the "handbag" contribution to the generalized parton distributions for deeply virtual [[Compton scattering]], which can be computed from the overlap of light-front wave functions, automatically satisfies the known [[Sum rule in quantum mechanics|sum rules]].

The light-front wave functions contain information about novel features of QCD. These include effects suggested from other approaches, such as [[Quark#Strong interaction and color charge|colortransparency]] transparency, hidden color, intrinsic [[Charm (quantum number)|charm]], [[Quark#Sea quarks|sea-quark]] symmetries, dijet diffraction, direct hard processes, and hadronic [[Spin (physics)|spin]] dynamics.

[[File:DIS parton model.svg|thumbnail|right|alt=Deep inelastic scattering|Deep inelastic electron-proton scattering]]