Meson Emission Model of Psi to N Nbar m Charmonium Strong Decays

Abstract

In this paper we consider a sequential "meson emission" mechanism for charmonium decays of the type Psi -> N Nbar m, where Psi is a generic charmonium state, N is a nucleon and m is a light meson. This decay mechanism, which may not be dominant in general, assumes that an NNbar pair is created during charmonium annihilation, and the light meson m is emitted from the outgoing nucleon or antinucleon line. A straightforward generalization of this model can incorporate intermediate N* resonances. We derive Dalitz plot event densities for the cases Psi = eta_c, J/psi, chi_c0, chi_c1} and psi' and m = pi0, f0 and omega (and implicitly, any 0^{-+}, 0^{++} or 1^{--} final light meson). It may be possible to separate the contribution of this decay mechanism to the full decay amplitude through characteristic event densities. For the decay subset Psi -> p pbar pi0 the two model parameters are known, so we are able to predict absolute numerical partial widths for Gamma(Psi -> p pbar pi0). In the specific case J/psi -> p pbar pi0 the predicted partial width and M_{p pi0} event distribution are intriguingly close to experiment. We also consider the possibility of scalar meson and glueball searches in Psi -> p pbar f0. If the meson emission contributions to Psi -> N Nbar m decays can be isolated and quantified, they can be used to estimate meson-nucleon strong couplings {g_NNm}, which are typically poorly known, and are a crucial input in meson exchange models of the NN interaction. The determination of g_NNpi from Jψ-> p pbar pi0 and the (poorly known) g_NNomega and the anomalous "strong magnetic" coupling kappa_{NNomega} from J/psi -> p pbar omega are considered as examples.

arXiv comment10 pages, 5 figures

References in corpus (21)

• The high-precision, charge-dependent Bonn nucleon-nucleon potential (CD-Bonn)
• Construction of high-quality Nucleon-Nucleon potential models
• Dispersion-Theoretical Analysis of the Nucleon Electromagnetic Formfactors
• Observation of a near-threshold enhancement in th p pbar mass spectrum from radiative J/psi-->gamma p pbar decays
• Meson-exchange Model for $\pi N$ scattering and $\gamma N->\pi N$ reaction
• Observation of a resonance X(1835) in J/ψ--> γπ^+ π^- η^{\prime}
• NN Core Interactions and Differential Cross Sections from One Gluon Exchange
• Study of Jψdecaying into ωp \bar p
• Partial wave analysis of J/psi to p pbar pi0
• Charmonium production in p pbar annihilation: Estimating cross sections from decay widths
• Observation of Thirteen New Exclusive Multi-Body Hadronic Decays of the $\psi (2S)$
• Nucleon-Meson Coupling Constants and Form Factors in the Quark Model
• Observation of p pbar pi^0 and p pbar eta in psi' decays
• The strong $\rho NN$ coupling derived from QCD
• Psi(2S) two- and three-body hadronic decays
• Associated Charmonium Production in Low Energy p-pbar Annihilation
• chi_cJ Decays to h^+h^-h^0
• chi_{cJ} Decays to h^+h^-h^0
• Evidence for a J/psi-ppbar Pauli Strong Coupling ?
• First observation of $\psi (2S)\to p\bar{n}{\pi }^{-}+c.c.$
• The $\omega NN$ couplings derived from QCD sum rules

Cited by in corpus (10)

• QCD description of charmonium plus light meson production in antiproton-nucleon annihilation
• Revisiting the production of charmonium plus a light meson at PANDA
• Probing charmonium-like state $X(3915)$ through meson photoproduction
• Implication of the observed $\psi (3770)\to p\bar{p}{\pi }^0$ for studying the $p\bar{p}\to \psi (3770){\pi }^0$ process
• Production of the charmoniumlike state $Y(4220)$ through the $p\bar{p}\to Y(4220){\pi }^0$ reaction
• The nucleon resonances in the $J/\psi \to p\bar{p}{\eta }^{\prime }$ decay
• Branching fractions for chi_cJ -> p p-bar pi^0, p p-bar eta, and p p-bar omega
• Role of the low-lying nucleon resonances in the $p\bar{p}\to \psi \eta$ reaction
• Psi to N Nbar m
• Recent Results on Charmonium Decays at CLEO-c