N->Delta transition from simultaneous measurements of p((gamma)over-right-arrow,pi) and p((gamma)over-right-arrow,gamma)

被引：159

作者：

Blanpied, G

Blecher, M

Caracappa, A

Djalali, C

Giordano, G

Hicks, K

Hoblit, S

Khandaker, M

Kistner, OC

Kuczewski, A

Lowry, M

Lucas, M

Matone, G

Miceli, L

Preedom, B

Rebreyend, D

Sandorfi, AM

Schaerf, C

Sealock, RM

Stroher, H

Thorn, CE

Thornton, ST

Tonnison, J

Whisnant, CS

Zhang, H

Zhao, X

机构：

[1] BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973

[2] IST NAZL FIS NUCL,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY

[3] UNIV ROMA TOR VERGATA,ROME,ITALY

[4] IST NAZL FIS NUCL,SEZ ROMA 2,ROME,ITALY

[5] UNIV VIRGINIA,DEPT PHYS,CHARLOTTESVILLE,VA 22901

[6] VIRGINIA POLYTECH INST & STATE UNIV,DEPT PHYS,BLACKSBURG,VA 24061

[7] OHIO UNIV,DEPT PHYS,ATHENS,OH 45701

[8] UNIV GIESSEN,INST PHYS 2,GIESSEN,GERMANY

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 79卷 / 22期

关键词：

D O I：

10.1103/PhysRevLett.79.4337

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

New high-precision measurements of p((gamma)over-right-arrow,pi) and p((gamma)over-right-arrow,gamma) cross sections and beam asymmetries have been combined with other polarization ratios in a simultaneous analysis of both reactions. Compton scattering has provided two important new constraints on the photopion amplitude. The E2/M1 mixing ratio for the N --> delta transition extracted from this analysis is [-3.0 +/- 0.3(stat + syst) +/- 0.2 (model)]%. Both data and analysis of this work are in conflict with recent results from Mainz.

引用

页码：4337 / 4340

页数：4

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