Twist-3 contribution to the pion electromagnetic form factor

Non-leading contribution to the pion electromagnetic form factor which comes from the pion twist-3 wave function is analyzed in the modified hard scattering approach (MHSA) proposed by Li and Sterman. This contribution is enhanced significantly due to bound state effect (the twist-3 wave function is...

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Bibliographic Details
Published in:arXiv.org 1998-06
Main Authors: Fu-Guang Cao, Yuan-Ben Dai, Chao-Shang, Huang
Format: Article
Language:English
Subjects:
Form factors
Online Access:Get full text
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Summary:Non-leading contribution to the pion electromagnetic form factor which comes from the pion twist-3 wave function is analyzed in the modified hard scattering approach (MHSA) proposed by Li and Sterman. This contribution is enhanced significantly due to bound state effect (the twist-3 wave function is independent of the fractional momentum carried by the parton and has a large factor \(\sim m_\pi^2/m_0\) with \(m_\pi\) being the pion meson mass and \(m_0\) being the mean u- and d-quark masses). Consequently, although it is suppressed by the factor \(1/Q^2\), the twist-3 contribution is comparable with and even larger than the leading twist (twist-2) contribution at intermediate energy region of \(Q^2\) being \(2 \sim 40 {GeV}^2\).
ISSN:2331-8422
DOI:10.48550/arxiv.9711203