Test of low-energy theorems for 1H(γover-right-arrow,π0)1H in the threshold region -: art. no. 232501

被引：74

作者：

Schmidt, A

Achenbach, P

Ahrens, J

Arends, HJ

Beck, R ^{[1
]}

Bernstein, AM

Hejny, V

Kotulla, M

Krusche, B

Kuhr, V

Leukel, R

MacGregor, IJD

McGeorge, JC

Metag, V

de León, VMO

Rambo, F

Siodlaczek, U

Ströher, H

Walcher, T

Weiss, J

Wissmann, F

Wolf, M

机构：

[1] Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany

[2] MIT, Dept Phys, Boston, MA USA

[3] MIT, Nucl Sci Lab, Boston, MA USA

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

[5] Univ Giessen, Inst Phys 2, D-35392 Giessen, Germany

[6] Univ Basel, Dept Phys & Astron, CH-4056 Basel, Switzerland

[7] Univ Gottingen, Inst Phys 2, D-37073 Gottingen, Germany

[8] Univ Glasgow, Dept Phys & Astron, Glasgow G12 8QQ, Lanark, Scotland

[9] Univ Tubingen, Inst Phys, D-72076 Tubingen, Germany

来源：

PHYSICAL REVIEW LETTERS | 2001年 / 87卷 / 23期

关键词：

D O I：

10.1103/PhysRevLett.87.232501

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The photon asymmetry in the reaction H-1(<(<gamma>)over right arrow>, pi (0))H-1 close to threshold has been measured for the first time with the photon spectrometer TAPS using linearly polarized photons from the tagged-photon facility at the Mainz Microtron MAMI. The total and differential cross sections were also measured simultaneously with the photon asymmetry. This allowed determination of the S-wave and all three P-wave amplitudes. The values obtained at threshold are E0+ = [-1.33 +/- 0.08(stat) +/- 0.03(syst)] x 10(-3)/m(pi+), P-1 = [9.47 +/- 0.08(stat) +/- 0.29(syst)] x 10(-3)q /m(pi+)(2) P-2 [-9.46 +/- 0.1(stat) +/- 0.29(syst)] x 10(-3)q/m(pi+)(2), and P-3 = [11.48 +/- 0.06(stat) +/- 0.35(syst)] x 10(-3)q/m(pi+)(2).

引用

页码：232501 / 1

页数：4

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