A CRITICAL-STUDY OF EFFECTIVE LAGRANGIAN MODELS FOR LOW-ENERGY PION-NUCLEON SCATTERING

被引：9

作者：

BOFINGER, D

WOOLCOCK, WS

机构：

[1] Department of Theoretical Physics, Research School of Physical Sciences, The Australian National University, Canberra, 2601, ACT

来源：

NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS | 1991年 / 104卷 / 10期

关键词：

D O I：

10.1007/BF02817432

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

An effective Lagrangian model of pion-nucleon scattering up to a laboratory pion kinetic energy of 250 MeV is presented, which includes N(939), N(1440) and DELTA(1232) exchange and t-channel exchanges. Unitarity is enforced on our amplitudes using three different Methods, and for the DELTA(1232) resonance we use both the standard propagator and a proposed alternative one. We also consider the effect of imposing constraints; from dispersion theory on our model. Although it is possible to obtain a reasonably good description of pion-nucleon scattering in this manner, we find that the ambiguity in the choice of unitarization technique makes it impossible to accurately determine the important parameters which are needed for the modelling of other processes.

引用

页码：1489 / 1502

页数：14

共 22 条

[1] MEASUREMENT OF THE ASYMMETRY PARAMETER-A IN PI-P ELASTIC AND CHARGE-EXCHANGE SCATTERING AT PION ENERGIES T-PI = 98, 238, 292, AND 310 MEV [J].

ALDER, JC ;

JOSEPH, C ;

PERROUD, JP ;

TRAN, MT ;

EATON, GH ;

FROSCH, R ;

HIRSCHMANN, H ;

MANGO, S ;

MCCULLOCH, JW ;

SHRAGER, P ;

STRASSNER, G ;

TRUOL, P ;

WEYMUTH, P ;

WIEDERKEHR, P .

PHYSICAL REVIEW D, 1983, 27 (05) :1040-1055

[2] PION-NUCLEON PARTIAL-WAVE ANALYSIS TO 1100 MEV [J].

ARNDT, RA ;

FORD, JM ;

ROPER, LD .

PHYSICAL REVIEW D, 1985, 32 (05) :1085-1103

[3] THEORY OF HIGH-SPIN FIELDS [J].

AURILIA, A ;

UMEZAWA, H .

PHYSICAL REVIEW, 1969, 182 (05) :1682-&

[4] REACTION PI-P-]PI-0N BELOW THE DELTA-RESONANCE [J].

BAGHERI, A ;

ANIOL, KA ;

ENTEZAMI, F ;

HASINOFF, MD ;

MEASDAY, DF ;

POUTISSOU, JM ;

SALOMON, M ;

ROBERTSON, BC .

PHYSICAL REVIEW C, 1988, 38 (02) :885-894

[5] 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

[6]

BERNSTEIN J, 1968, ELEMENTARY PARTICLES

[7]

Close F. E., 1979, INTRO QUARKS PARTONS

[8]

DEPECCEI R, 1968, PHYS REV, V176, P1812

[9] COMPILATION OF COUPLING-CONSTANTS AND LOW-ENERGY PARAMETERS [J].

DUMBRAJS, O ;

KOCH, R ;

PILKUHN, H ;

OADES, GC ;

BEHRENS, H ;

DESWART, JJ ;

KROLL, P .

NUCLEAR PHYSICS B, 1983, 216 (02) :277-335

[10]

ERICSON T, 1988, PIONS NUCLEI

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