Nucleon polarization in the process e+e- → N(N)over-bar near threshold

被引：3

作者：

Bondar, A. E.

Dmitriev, V. F.

Milstein, A. I. ^{[1
]}

Strakhovenko, V. M.

机构：

[1] Budker Inst Nucl Phys, Novosibirsk 630090, Russia

来源：

PHYSICS LETTERS B | 2011年 / 697卷 / 02期

关键词：

Nucleon; Form factor; Polarization; Threshold; FORM-FACTORS; LOW-ENERGY; PROTON;

D O I：

10.1016/j.physletb.2011.01.049

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The process e(+)e(-) -> N (N) over bar is studied nearby a threshold with account for polarizations of all initial and final particles. The nucleon polarization zeta(N) reveals a strong energy dependence due to that of the nucleon electromagnetic form factors G(E)(Q(2)) and G(M)(Q(2)) caused by the final-state interaction of nucleons. It is shown that the modulus of the ratio of these form factors and their relative phase can be determined by measuring zeta(N) along with the differential cross section. The polarization degree is analyzed using Paris N (N) over bar optical potential for calculation of the form factors. It turns out that vertical bar zeta(N)vertical bar is high enough in a rather wide energy range above the threshold. Being especially high for longitudinally polarized beams. vertical bar zeta(N)vertical bar is noticeable even if both e(+)e(-) beams are unpolarized. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：159 / 163

页数：5

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