The σ-meson production in excited Υ decay processes:: constraint from chiral symmetry

被引：30

作者：

Ishida, M ^{[1
]}

Ishida, S

Komada, T

Matsumoto, SI

机构：

[1] Tokyo Inst Technol, Dept Phys, Tokyo 1528551, Japan

[2] Nihon Univ, Coll Sci & Technol, Atom Energy Res Inst, Tokyo 1018308, Japan

来源：

PHYSICS LETTERS B | 2001年 / 518卷 / 1-2期

关键词：

D O I：

10.1016/S0370-2693(01)01055-3

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In the recent letter [T. Komada, M. Ishida, S. Ishida, Phys. Lett. B 508 (2001) 31], hereafter referred to as I, we have shown that the pi pi mass spectra in various excited Y decay processes are phenomenologically well reproduced by a coherent sum of a Breit-Wigner amplitude and of the direct 2 pi -production amplitude. On the other hand, the pi pi -production amplitude was widely believed to be suppressed generally near the threshold, because of the derivative coupling property of Nambu-Goldstone pi meson. In this Letter we show that the "threshold-suppression" does not hold in the process with large energy release, in conformity with the steep increase from the pi pi threshold observed in the transition Y(3S --> IS), and that the method of I is consistent with chiral symmetry. Furthermore, applying an effective amplitude explicitly consistent with chiral symmetry, we reanalyze the typical pi pi -spectra. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：47 / 54

页数：8

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