Flavor Decomposition of the Elastic Nucleon Electromagnetic Form Factors

被引：122

作者：

Cates, G. D.

de Jager, C. W. ^{[1
]}

Riordan, S. ^{[2
]}

Wojtsekhowski, B. ^{[1
]}

机构：

[1] Thomas Jefferson Natl Accelerator Facil, Newport News, VA 23606 USA

[2] Univ Massachusetts, Amherst, MA 01003 USA

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 25期

关键词：

GENERALIZED PARTON DISTRIBUTIONS; PROTON; SCATTERING; NEUTRON;

D O I：

10.1103/PhysRevLett.106.252003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The u- and d-quark contributions to the elastic nucleon electromagnetic form factors have been determined by using experimental data on G(E)(n), G(M)(n), G(E)(p), and G(M)(p). Such a flavor separation of the form factors became possible up to negative four-momentum transfer squared Q(2) = 3.4 GeV2 with recent data on G(E)(n) from Hall A at Jefferson Lab. For Q(2) above 1 GeV2, for both the u and the d quark, the ratio of the Pauli and Dirac form factors, F-2/F-1, was found to be almost constant in sharp contrast to the behavior of F-2/F-1 for the proton as a whole. Also, again for Q(2) > 1 GeV2, both F-2(d) and F-1(d) are roughly proportional to 1/Q(4), whereas the dropoff of F-2(u) and F-1(u) is more gradual.

引用

页数：4

共 44 条

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