DETERMINING THE AXIAL RADIUS OF THE NUCLEON FROM DATA ON PION ELECTROPRODUCTION

被引:56
作者
BERNARD, V
KAISER, N
MEISSNER, UG
机构
[1] UNIV STRASBOURG 1, F-67070 STRASBOURG, FRANCE
[2] TECH UNIV MUNICH, DEPT PHYS T30, W-8046 GARCHING, GERMANY
[3] UNIV BERN, INST THEORET PHYS, CH-3012 BERN, SWITZERLAND
关键词
D O I
10.1103/PhysRevLett.69.1877
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We discuss a low-energy theorem of threshold pion electroproduction which allows one to determine the axial root-mean-square radius r(A) of the nucleon. We show that at the same order where the radius appears, pion loops induce a small correction to the momentum dependence of the electric dipole amplitude E0+(-). This correction amounts to a decrease of the axial mean-square radius by 5% from the electroproduction data and allows one to explain the small discrepancy to the values determined from (anti)neutrino-proton scattering data.
引用
收藏
页码:1877 / 1879
页数:3
相关论文
共 21 条
[1]   MEASUREMENT OF NEUTRINO-PROTON AND ANTINEUTRINO-PROTON ELASTIC-SCATTERING [J].
AHRENS, LA ;
ARONSON, SH ;
CONNOLLY, PL ;
GIBBARD, BG ;
MURTAGH, MJ ;
MURTAGH, SJ ;
TERADA, S ;
WHITE, DH ;
CALLAS, JL ;
CUTTS, D ;
HOFTUN, JS ;
DIWAN, M ;
LANOU, RE ;
SHINKAWA, T ;
KURIHARA, Y ;
AMAKO, K ;
KABE, S ;
NAGASHIMA, Y ;
SUZUKI, Y ;
TATSUMI, S ;
YAMAGUCHI, Y ;
ABE, K ;
BEIER, EW ;
DOUGHTY, DC ;
DURKIN, LS ;
HEAGY, SM ;
HURLEY, M ;
MANN, AK ;
NEWCOMER, FM ;
WILLIAMS, HH ;
YORK, T ;
HEDIN, D ;
MARX, MD ;
STERN, E .
PHYSICAL REVIEW D, 1987, 35 (03) :785-809
[2]   A STUDY OF THE AXIAL-VECTOR FORM-FACTOR AND 2ND-CLASS CURRENTS IN ANTINEUTRINO QUASIELASTIC SCATTERING [J].
AHRENS, LA ;
ARONSON, SH ;
GIBBARD, BG ;
MURTAGH, MJ ;
WHITE, DH ;
CALLAS, JL ;
CUTTS, D ;
DIWAN, M ;
HOFTUN, JS ;
LANOU, RE ;
KURIHARA, Y ;
ABE, K ;
AMAKO, K ;
KABE, S ;
SHINKAWA, T ;
TERADA, S ;
NAGASHIMA, Y ;
SUZUKI, Y ;
YAMAGUCHI, Y ;
BEIER, EW ;
DURKIN, LS ;
HEAGY, SM ;
MANN, AK ;
HEDIN, D ;
MARX, MD ;
STERN, E .
PHYSICS LETTERS B, 1988, 202 (02) :284-288
[3]  
[Anonymous], SPRINGER TRACTS MODE
[4]   ON THE LOW-ENERGY THEOREMS FOR THRESHOLD PION ELECTROPRODUCTION [J].
BERNARD, V ;
KAISER, N ;
MEISSNER, UG .
PHYSICS LETTERS B, 1992, 282 (3-4) :448-452
[5]   NEUTRAL PION-PHOTOPRODUCTION AT THRESHOLD [J].
BERNARD, V ;
KAISER, N ;
GASSER, J ;
MEISSNER, UG .
PHYSICS LETTERS B, 1991, 268 (02) :291-295
[6]  
Bernard V., IN PRESS
[7]  
BERNARD V, 1992, IN PRESS BUTP9215 BE
[8]  
BERNARD V, BUTP9201 BERN U REP
[9]  
BERNSTEIN AM, COMMUNICATION
[10]   THRESHOLD PI+ ELECTROPRODUCTION AT HIGH-MOMENTUM TRANSFER - DETERMINATION OF NUCLEON AXIAL-VECTOR FORM-FACTOR [J].
DELGUERRA, A ;
GIAZOTTO, A ;
GIORGI, MA ;
STEFANINI, A ;
BOTTERILL, DR ;
MONTGOMERY, HE ;
NORTON, PR ;
MATONE, G .
NUCLEAR PHYSICS B, 1976, 107 (01) :65-81