AMPLITUDE ANALYSIS OF GAMMA-GAMMA-]PI-PI FROM THRESHOLD TO 1.4 GEV

被引：67

作者：

MORGAN, D ^{[1
]}

PENNINGTON, MR ^{[1
]}

机构：

[1] UNIV DURHAM,CTR PARTICLE THEORY,DURHAM DH1 3LE,ENGLAND

来源：

ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS | 1990年 / 48卷 / 04期

关键词：

D O I：

10.1007/BF01614697

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：

A new amplitude analysis of results on gamma-gamma- -->pi+pi- from the Mark II and gamma-gamma- --> pi(o)pi(o) from the Crystal Ball experiments is reported. Key constraints from the low energy theorem and from analyticity and unitarity that relate gamma-gamma- -->pi-pi to other meson scattering reactions are built into the trial forms. Despite these restrictions, the limited angular converge of the experiments means that solutions with quite different proportions of S wave and D waves of both helicities 0 and 2 are admitted above 1 GeV. This leads to a much wider range of possibilities for the couplings of the broad resonances f(o)(epsilon) and f2(1270) than is commonly supposed. The better fits have GAMMA(fo) in excess of 4 keV and a ratio of GAMMA(fo)/GAMMA(f2) greater than 2.

引用

页码：623 / 632

页数：10

共 50 条

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