Journal
PHYSICS LETTERS B
Volume 518, Issue 1-2, Pages 47-54Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0370-2693(01)01055-3
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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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