THRESHOLD 2-PION PHOTOPRODUCTION AND ELECTROPRODUCTION - MORE NEUTRALS THAN EXPECTED

被引：37

作者：

BERNARD, V

KAISER, N

MEISSNER, UG

SCHMIDT, A

机构：

[1] UNIV STRASBOURG 1,F-67037 STRASBOURG 2,FRANCE

[2] TECH UNIV MUNICH,DEPT PHYS T30,D-85747 GARCHING,GERMANY

来源：

NUCLEAR PHYSICS A | 1994年 / 580卷 / 03期

关键词：

D O I：

10.1016/0375-9474(94)90910-5

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

We present an exploratory study of two-pion photo- and electroproduction off the nucleon in the threshold region. To calculate the pertinent amplitudes, we make use of heavy baryon chiral perturbation theory. We show that due to finite chiral loops the production cross section for final states with two neutral pions is considerably enhanced. The experimental implications are briefly discussed.

引用

收藏

页码：475 / 499

页数：25

相关论文

共 21 条

[1]

[Anonymous], 1979, PION ELECTROPRODUCTI

[2] MEASUREMENT OF THE P(GAMMA,PI-0) CROSS-SECTION AT THRESHOLD [J].

BECK, R ;

KALLEICHER, F ;

SCHOCH, B ;

VOGT, J ;

KOCH, G ;

STROHER, H ;

METAG, V ;

MCGEORGE, JC ;

KELLIE, JD ;

HALL, SJ .

PHYSICAL REVIEW LETTERS, 1990, 65 (15) :1841-1844

[3] PROBLEMS OF DESCRIBING SPIN-3/2 BARYON RESONANCES IN THE EFFECTIVE LAGRANGIAN THEORY [J].

BENMERROUCHE, M ;

DAVIDSON, RM ;

MUKHOPADHYAY, NC .

PHYSICAL REVIEW C, 1989, 39 (06) :2339-2348

[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] CONSISTENT CALCULATION OF THE NUCLEON ELECTROMAGNETIC POLARIZABILITIES IN CHIRAL PERTURBATION-THEORY BEYOND NEXT-TO-LEADING ORDER [J].

BERNARD, V ;

KAISER, N ;

SCHMIDT, A ;

MEISSNER, UG .

PHYSICS LETTERS B, 1993, 319 (1-3) :269-275

[6] CHIRAL STRUCTURE OF THE NUCLEON [J].

BERNARD, V ;

KAISER, N ;

KAMBOR, J ;

MEISSNER, UG .

NUCLEAR PHYSICS B, 1992, 388 (02) :315-345

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

BERNARD, V ;

KAISER, N ;

MEISSNER, UG .

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

[8] THRESHOLD PION ELECTROPRODUCTION IN CHIRAL PERTURBATION-THEORY [J].

BERNARD, V ;

KAISER, N ;

LEE, TSH ;

MEISSNER, UG .

PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 1994, 246 (06) :315-363

[9] CHIRAL EXPANSION OF THE NUCLEONS ELECTROMAGNETIC POLARIZABILITIES [J].

BERNARD, V ;

KAISER, N ;

MEISSNER, UG .

PHYSICAL REVIEW LETTERS, 1991, 67 (12) :1515-1518

[10]

BERNARD V, 1992, PI N NEWSLETTER, V7, P62