Parton Physics from Large-Momentum Effective Field Theory

Parton physics, when formulated as light-front correlations, are difficult to study non-perturbatively, despite the promise of light-front quantization. Recently an alternative approach to partons have been proposed by re-visiting original Feynman picture of a hadron moving at asymptotically large momentum. Here I formulate the approach in the language of an effective field theory for a large hadron momentum

P

in lattice QCD, LaMET for short. I show that using this new effective theory, parton properties, including light-front parton wave functions, can be extracted from lattice observables in a systematic expansion of

1/P

, much like that the parton distributions can be extracted from the hard scattering data at momentum scales of a few GeV.

Note:

10 pages, 1 fig. Science China, 2014

proton structure
high-energy scattering
lattice QCD
effective field theory
partons
parton: distribution function
parton: wave function
quantization: light front
hadron: momentum
effective field theory

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