UNITARITY AND K(L)-]PI(0)GAMMA-GAMMA

被引：66

作者：

COHEN, AG

ECKER, G

PICH, A

机构：

[1] UNIV VIENNA,INST THEORET PHYS,A-1090 VIENNA,AUSTRIA

[2] CERN,DIV THEORY,CH-1211 GENEVA 23,SWITZERLAND

来源：

PHYSICS LETTERS B | 1993年 / 304卷 / 3-4期

关键词：

D O I：

10.1016/0370-2693(93)90307-4

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We discuss the rare decay K(L) --> pi0gammagamma. Although the recently measured 2gamma-invariant-mass distribution is in quite good agreement with the lowest-order chiral perturbation theory prediction, there seems to be a discrepancy with the calculated branching ratio. We extend the previous computations to next-to-leading order, O(p6). The two dominant mechanisms at this order are emphasized: the two-pion intermediate state and vector meson exchange.

引用

页码：347 / 352

页数：6

共 15 条

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