Evidence for a J/psi p anti-p Pauli Strong Coupling?
The couplings of charmonia and charmonium hybrids (generically $$\Psi$$) to $$p\bar p$$ are of great interest in view of future plans to study these states using an antiproton storage ring at GSI. These low to moderate energy $$\Psi p\bar p$$ couplings are not well understood theoretically, and must currently be determined from experiment. In this letter we note that the two independent $$p\bar p$$ couplings $$\gamma_{\mu}$$ and $$\sigma_{\mu\nu}$$ of the narrow vector charmonium states $$J/\psi$$ and $$\psi'$$ can be extracted from the angular distributions of the reactions $$e^+e^- \to J/\psi \to p\bar p$$ and $$e^+e^- \to \psi' \to p\bar p$$. The relation between the unpolarized differential cross sections and these couplings has a twofold ambiguity, so the coupling constants are not uniquely determined by this data. This ambiguity can be resolved by a study of the polarized reaction or of the unpolarized processes $$e^+e^- \to (J/\psi, \psi'\, ) \to \Lambda\bar \Lambda$$.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE - Office of Energy Research (ER)
- DOE Contract Number:
- AC05-06OR23177
- OSTI ID:
- 915500
- Report Number(s):
- JLAB-THY-07-730; DOE/OR/23177-0150; TRN: US0804994
- Journal Information:
- Physical Review D, Vol. 77, Issue 05
- Country of Publication:
- United States
- Language:
- English
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