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Parton physics from large-momentum effective field theory

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Abstract

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.

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Authors and Affiliations

  1. INPAC, Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, 200240, China

    XiangDong Ji

  2. Maryland Center for Fundamental Physics, Department of Physics, University of Maryland, College Park, Maryland, 20742, USA

    XiangDong Ji

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Correspondence to XiangDong Ji.

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Contributed by JI XiangDong (Associate Editor-in-Chief)

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Ji, X. Parton physics from large-momentum effective field theory. Sci. China Phys. Mech. Astron. 57, 1407–1412 (2014). https://doi.org/10.1007/s11433-014-5492-3

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