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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 | 811Pages: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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On the singular beha（339KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | Application Full Text |
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