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
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.
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页码:47 / 54
页数:8
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