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Hadrons and Nuclei


Eur. Phys. J. A 11, 341-344 (2001)

Study of N*(1440) from ${J/\Psi}$ decays

B.S. Zou1, 2, 3, 4, G.X. Peng1, 2, R.G. Ping2, H.C. Chiang1, 2, 3, 4, W.X. Ma1, 2 and P.N. Shen1, 2, 3, 4

1  CCAST (World Lab.), P.O. Box 8730, Beijing 100080, PRC
2  Institute of High Energy Physics, Chinese Academy of Sciences, P.O. Box 918(4), Beijing 100039, PRC
3  Institute of Theoretical Physics, Chinese Academy of Sciences, P.O. Box 2735, Beijing 100080, PRC
4  Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, PRC

zoubs@mail.ihep.ac.cn

(Received: 1 June 2001 Communicated by V.V. Anisovich)

Abstract
For $J/\Psi\to\bar pp \pi^0$ and $\bar pp\pi^+\pi^-$, the $\pi^0p$ and $p\pi^+\pi^-$ systems are limited to be pure isospin-(1/2) due to isospin conservation. This is a big advantage in studying N* resonances from ${J/\Psi}$ decays, compared with $\pi N$ and $\gamma N$ experiments. The process $J/\Psi\to\bar pN^*$ or $p\bar N^*$ provides a new way to probe the internal structure of the N* resonances. Here we report a quark model calculation for $J/\Psi\to\bar pp$, $\bar pN^*(1440)$ and $\bar N^*N^*$. The implication for the internal structure of N*(1440) is discussed.

PACS
14.20.Gk - Baryon resonances with S=0 .
13.25.Gv - Decays of $J/\psi$, $\Upsilon$, and other quarkonia.
13.65.+i - Hadron production by electron-positron collisions.

© Società Italiana di Fisica, Springer-Verlag 2001