Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-10-17
Physics
High Energy Physics
High Energy Physics - Phenomenology
revised and extended version
Scientific paper
The reaction mechanisms of the following proton diffractive scattering processes are studied and compared with one another: $\gamma^* p\to Vp,\gamma^* p\to Xp, pp\to (\Lambda K^+)p$ and $pA\to \Lambda K^+A$ (Here, $\gamma^*$ stands for the space-like photon in inelastic electron-proton scattering, $V$ for the vector mesons $\rho,\omega,\phi,J/\psi$, and $A$ for a target nucleus.) It is shown that, by taking parity, and C--parity conservation into account, the existing data for these reactions strongly suggest the following: A considerable part of the objects exchanged between projectile and target in the above-mentioned processes are virtual quark-antiquark pairs in color-singlet states with $J^{PC}=0^{-+}$, $I^G=0^+$, where $J$ stands for total angular momentum, $I$ for isospin, $P$, $C$ and $G$ stand for parity, C-parity and G-parity respectively. Such quark-antiquark pairs are created by soft-gluon interactions. New experiments are suggested; and predictions for such experiments are made.
Boros C.
Ta-chung Meng
Zuo-tang Liang
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