Two-photon Processes in Two-nucleon Systems as a Tool of Searching for Exotic Six-quark Resonances
نویسنده
چکیده
The reaction pp → pp2γ, proposed earlier to probe for the NN–decoupled dibaryon resonances, has been studied by the DIB2γ Collaboration (JINR) and their preliminary data seem to give evidence for the resonance effect at about 1920 MeV. We discuss some other two-photon processes: the double radiative capture reaction in pionic deuterium, photoabsorption sum rules and the nuclear Compton scattering, which we consider to be feasible for further test and invesigation of possible low-lying, exotic six-quark states.
منابع مشابه
Radiative processes of nucleon interactions and possible existence of exotic
Radiative processes of nucleon interactions and possible existence of exotic dibaryons 1. Abstract The cross section of the reaction pp → ppγγ is estimated and the exploration possibilities of this reaction to probe for a possible excitation of subnuclear degrees of freedom in two-nucleon systems, in particular, the production and decay of the NN-decoupled dibaryon resonances, are briefly discu...
متن کاملMissing Nucleon Resonances in Kaon Production with Pions and Photons
Like any composite system the nucleon can be excited into a number of resonant or compound states. However, due to the nonperturbative nature of QCD at nucleon resonance energies no rigorous understanding of N resonances on the basis of QCD has emerged. Lattice QCD has only recently begun to contribute to this field. In a recent study 1 the excitation energies of 1/2 and 3/2 baryon resonances a...
متن کاملManifestations of anomalous glue: light-mass exotic mesons and gη′NN
The light-mass exotics with J = 1 observed at BNL and CERN may have a simple explanation as dynamically generated resonances in η′π rescattering in the final state interaction. This dynamics is mediated by the same anomalous glue which also generates the large mass of the η′. OZI violating processes are also potentially important to η′ production in proton-proton collisions close to threshold. ...
متن کاملOn the existence of exotic and non-exotic multiquark meson states
To obtain an exact solution of a four-body system containing two quarks and two antiquarks interacting through two-body terms is a cumbersome task that has been tackled with more or less success during the last decades. We present an exact method for the study of four-quark systems based on the hyperspherical harmonics formalism that allows us to solve it without resorting to further approximat...
متن کاملar X iv : h ep - p h / 99 04 25 4 v 1 7 A pr 1 99 9 TWO - PHOTON PRODUCTION OF FOUR - QUARK STATES UP TO THE J / ψ ENERGY ∗
Evidence for an explicitly exotic state with isospin 2 and spin-parity 2 + near the ρρ threshold and nontrivial complementary indications of the unusual quark composition of the f0(980) and a0(980) states obtained from the reactions of two-photon formation of neutral meson resonances are discussed, together with puzzling phenomena in the channels γγ → ρ 0 φ and γγ → ρ 0 ρ 0 at high energies.
متن کامل