QUANTUM NUMBER CONSERVATION IN STATISTICAL-MODELS AND ITS APPLICATION TO P(P)OVER-BAR-ANNIHILATION AT REST

被引：8

作者：

BLUMEL, W

KOCH, P

HEINZ, U

机构：

[1] UNIV BREMEN,INST THEORET PHYS,D-28334 BREMEN,GERMANY

[2] UNIV CALIF SANTA BARBARA,INST THEORET PHYS,SANTA BARBARA,CA 93106

来源：

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS | 1994年 / 63卷 / 04期

关键词：

D O I：

10.1007/BF01557630

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：

We investigate the role of exact quantum number conservation in small statistical systems and illustrate the consequences for ppBAR-annihilation at rest. A group theoretical projection method is used to calculate a restricted canonical partition function which consists only of states allowed by the conservation laws. Special emphasis is put on the conservation of isospin, total angular momentum, and C-, G-, and P-parities. Our analysis of the partition function shows that it is increasingly dominated by two-particle states as more of the conservation laws are included. The constraining effects on various multiplicity ratios and the deviations from the unconstrained limit are discussed in detail.

引用

页码：637 / 650

页数：14

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