More on large-momentum effective theory approach to parton physics
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Publication:1676163
DOI10.1016/J.NUCLPHYSB.2017.09.001zbMATH Open1373.81386arXiv1706.07416OpenAlexW2672077685MaRDI QIDQ1676163
Author name not available (Why is that?)
Publication date: 3 November 2017
Published in: (Search for Journal in Brave)
Abstract: Large-Momentum Effective Theory (or LaMET) advocated by the present authors provides a direct approach to simulate parton physics in Eulidean lattice QCD theory. Recently, there has been much interest in this theory in the literature, with some questioning its validity and effectiveness. Here we provide some discussions aiming at a further exposition of this approach. In particular, we explain why it does not have the usual power divergence problem in lattice QCD calculations for the moments of parton distributions. We show that although the Ioffe-time distribution provides an alternative way to extract the parton distribution from the same lattice observable, it also requires the same large momentum limit as in LaMET to obtain a precision calculation. With a proper quantification of errors, both extraction methods should be compared with the same lattice data.
Full work available at URL: https://arxiv.org/abs/1706.07416
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