AXIAL AND PSEUDOSCALAR NUCLEON FORM-FACTORS FROM LOW-ENERGY PION ELECTROPRODUCTION

被引：99

作者：

CHOI, S

DUVAL, MA

ELOUADRHIRI, L

ESTENNE, V

BARDIN, G

BERTHOT, J

BERTIN, PY

DEBOTTON, N

DIDELEZ, JP

FONVIEILLE, H

FOURNIER, G

FRASCARIA, R

GIFFON, M

GUICHON, PAM

MARCHAND, C

MARRONCLE, J

MARTINO, J

MILLER, J

NAHABETIAN, R

SAGHAI, B

SAMOUR, C

VERNIN, P

WARDE, E

机构：

[1] UNIV PARIS 11,INST PHYS NUCL,F-91406 ORSAY,FRANCE

[2] UNIV CLERMONT FERRAND,PHYS CORPUSCULAIRE LAB,F-63170 CLERMONT FERRAND,FRANCE

[3] UNIV LYON 1,INST PHYS NUCL,F-69622 VILLEURBANNE,FRANCE

来源：

PHYSICAL REVIEW LETTERS | 1993年 / 71卷 / 24期

关键词：

D O I：

10.1103/PhysRevLett.71.3927

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The cross section for exclusive pi+ electroproduction on the proton has been measured near threshold for the first time at two different values of the virtual photon polarization (epsilon is similar to 0.2 and epsilon is similar to 0.7). Using the low energy theorem for this reaction we deduce the axial and pseudoscalar weak form factors G(A) and G(P) at Absolute value of t = 0.073, 0.139, and 0.179 (GeV/c)2. The slope of G(A) agrees with the value obtained in neutrino experiments. G(P) satisfies the pion pole dominance hypothesis, which is thus verified for the first time in this range of transfer.

引用

页码：3927 / 3930

页数：4

共 19 条

[1]

ADLER S, 1968, CURRENT ALBEGRAS

[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] MEASUREMENT OF THE ORTHO-PARA TRANSITION RATE IN THE P-MU-P MOLECULE AND DEDUCTION OF THE PSEUDOSCALAR COUPLING-CONSTANT GP-MU [J].

BARDIN, G ;

DUCLOS, J ;

MAGNON, A ;

MARTINO, J ;

RICHTER, A ;

ZAVATTINI, E ;

BERTIN, A ;

PICCININI, M ;

VITALE, A .

PHYSICS LETTERS B, 1981, 104 (04) :320-324

[4] THRESHOLD PION-PHOTOPRODUCTION IN CHIRAL PERTURBATION-THEORY [J].

BERNARD, V ;

KAISER, N ;

MEISSNER, UG .

NUCLEAR PHYSICS B, 1992, 383 (03) :442-496

[5]

CHOI S, 1993, THESIS U PARIS SUD

[6]

CHOI SY, IN PRESS

[7]

DEALFARO AI, 1970, NUCL PHYS B, V36, P589

[8] MEASUREMENTS OF THRESHOLD PI+ ELECTROPRODUCTION AT LOW MOMENTUM-TRANSFER [J].

DELGUERRA, A ;

GIAZOTTO, A ;

GIORGI, MA ;

STEFANINI, A ;

BOTTERILL, DR ;

BRABEN, DW ;

CLARKE, D ;

NORTON, PR .

NUCLEAR PHYSICS B, 1975, 99 (02) :253-286

[9] 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

[10]

ERICSON T, 1988, PIONS NUCLEI

← 1 2 →