UNITARITY AND GAMMA-GAMMA-]PI-PI IN CHIRAL PERTURBATION-THEORY

被引：28
|
作者：
DOBADO, A
PELAEZ, JR
机构：
[1] Departamento de Física Teórica, Universidad Complutense de Madrid, Madrid
来源：
ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS | 1993年 / 57卷 / 03期
关键词：
D O I：
10.1007/BF01474345
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：
The direct chiral perturbation theory (ChPT) one-loop prediction for the production of two pions from two photons is compared with the recent Crystal Ball experimental data. The one-loop computation does not fit data even close to threshold because unitarity effects are important even at very low energies. However, when the constraints coming from unitarity and analyticity are included in a suitable way, the range of application of one-loop ChPT can be largely extended in agreement with the experiment.
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页码：501 / 510
页数：10
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