On the singular behavior of the chirality-odd twist-3 parton distribution e(x)

doi:10.1016/j.physletb.2020.135947

ITP OpenIR > SCI期刊论文

	Ma, J. P.; Zhang, G. P.
	On the singular behavior of the chirality-odd twist-3 parton distribution e(x)
Source Publication	PHYSICS LETTERS B
Language	英语
Keyword	Q(2) EVOLUTION
Abstract	The first moment of the chirality-odd twist-3 parton distribution e(x) is related to the pion-nucleon sigma-term, which is important for phenomenology. However, the possible existence of a singular contribution proportional to delta(x) in the distribution prevents the determination of the a-term with e(x) extracted from experimental data. There are two approaches to show the existence: the first one is based on an operator identity; the second one is based on a perturbative calculation of a single quark state with finite quark mass. We show that all contributions proportional to delta(x) in the first approach are canceled. For the second approach we find that e(x) of a multiparton state with a massless quark has no contribution with delta(x). Considering that a proton is essentially a multiparton state, the effect of the contribution with delta(x) is expected to be suppressed by light quark masses with arguments from perturbation theory. A detailed discussion of the difference between cut diagrams and uncut diagrams of e(x) is provided. (C) 2020 The Author(s). Published by Elsevier B.V.
	2020
ISSN	0370-2693
Volume	811 Pages:135947
Cooperation Status	国内
Subject Area	Astronomy & Astrophysics ; Physics
MOST Discipline Catalogue	Astronomy & Astrophysics ; Physics, Nuclear ; Physics, Particles & Fields
DOI	10.1016/j.physletb.2020.135947
Indexed By	SCIE
Citation statistics
Document Type	期刊论文
Identifier	http://ir.itp.ac.cn/handle/311006/27425
Collection	SCI期刊论文
Affiliation	1.[Ma, J. P.] Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, POB 2735, Beijing 100190, Peoples R China 2.[Ma, J. P.] Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China 3.[Ma, J. P.] Peking Univ, Sch Phys, Beijing 100871, Peoples R China 4.[Ma, J. P.] Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China 5.[Zhang, G. P.] Yunnan Univ, Dept Phys, Kunming 650091, Yunnan, Peoples R China
Recommended Citation GB/T 7714	Ma, J. P.,Zhang, G. P.. On the singular behavior of the chirality-odd twist-3 parton distribution e(x)[J]. PHYSICS LETTERS B,2020,811:135947.
APA	Ma, J. P.,&Zhang, G. P..(2020).On the singular behavior of the chirality-odd twist-3 parton distribution e(x).PHYSICS LETTERS B,811,135947.
MLA	Ma, J. P.,et al."On the singular behavior of the chirality-odd twist-3 parton distribution e(x)".PHYSICS LETTERS B 811(2020):135947.

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