Pion Electromagnetic Form Factor at Spacelike Momenta

被引：168

作者：

Chang, L. ^{[1
]}

Cloet, I. C. ^{[2
]}

Roberts, C. D. ^{[2
]}

Schmidt, S. M. ^{[3
,4
]}

Tandy, P. C. ^{[5
]}

机构：

[1] Forschungszentrum Julich, Inst Kernphys, D-52425 Julich, Germany

[2] Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA

[3] Forschungszentrum Julich, Inst Adv Simulat, D-52425 Julich, Germany

[4] JARA, D-52425 Julich, Germany

[5] Kent State Univ, Dept Phys, Ctr Nucl Res, Kent, OH 44242 USA

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 111卷 / 14期

基金：

美国国家科学基金会;

关键词：

DYSON-SCHWINGER EQUATIONS; THEOREM; MODEL;

D O I：

10.1103/PhysRevLett.111.141802

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A novel method is employed to compute the pion electromagnetic form factor, F-pi(Q(2)), on the entire domain of spacelike momentum transfer using the Dyson-Schwinger equation (DSE) framework in QCD. The DSE architecture unifies this prediction with that of the pion's valence-quark parton distribution amplitude (PDA). Using this PDA, the leading-order, leading-twist perturbative QCD result for Q(2)F(pi)(Q(2)) underestimates the full computation by just 15% on Q(2) greater than or similar to 8 GeV2, in stark contrast to the result obtained using the asymptotic PDA. The analysis shows that hard contributions to the pion form factor dominate for Q(2) greater than or similar to 8 GeV2, but, even so, the magnitude of Q(2)F(pi)(Q(2)) reflects the scale of dynamical chiral symmetry breaking, a pivotal emergent phenomenon in the standard model.

引用

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