A possible hadronic excess in psi(2S) decay and rho-pi puzzle
Abstract
We examine the so-called rho-pi puzzle of the psi(2S) decay by incorporating two inputs: One is the relative phase between the one-photon and the gluon decay amplitude, and the other is a possible anomaly in the inclusive nonelectromagnetic decay rate of psi(2S). We propose the possibility that in the psi(2S) decay a hadronic decay process of long distance origin is important in addition to the short-distance decay process. The amplitude of this additional process should nearly cancel the three-gluon amplitude in the exclusive psi(2S)---> 1-0- and turn the sum dominantly real in contrast to the J/psi decay. We present general consequences of this mechanism and then briefly look into two models which possibly explain the course of this additional amplitude.
Keywords
Cite
@article{arxiv.hep-ph/0006296,
title = {A possible hadronic excess in psi(2S) decay and rho-pi puzzle},
author = {M. Suzuki},
journal= {arXiv preprint arXiv:hep-ph/0006296},
year = {2009}
}
Comments
14 pages, 2 Tables, and 3 eps figures. Replaces the original version with a minor change in the title and inclusion of more references. The version to appear in Phys. Rev. D