A possible explanation why the Theta+ is seen in some experiments and not in others

Abstract

To understand the whole set of positive and null data on the Theta+(1530)-production, we suggest the hypothesis that multiquark hadrons are mainly generated from many-quark states, which emerge either as short-term hadron fluctuations, or as hadron remnants in hard processes. This approach allows us to describe both non-observation of the Theta+ in current null experiments and peculiar features of its production in positive experiments. Further, we are able to propose new experiments that might be decisive for the problem of the Theta+ existence. Distributions of the Theta+ in such experiments can give important information both on higher Fock components of conventional hadrons and about structure and hadronization properties of hadron remnants produced in hard processes. We also explain that description of multiquark hadrons may require a modified form of the constituent quark model, with quark masses and couplings being intermediate between their values for the familiar constituent quarks and the current ones.

18 pages. Some changes in the text; experimental suggestions collected in a special subsection, references added and refreshed

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• Big-Bang nucleosynthesis (Particle Data Group mini-review)
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• Improvement of the Theta+ width estimation method on the Light Cone
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• Search for a pentaquark decaying to p K_S^0
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• Quark spin content of the proton, hyperon semileptonic decays, and the decay width of the ${\Theta }^{+}$ pentaquark
• The narrow pentaquark
• Study of Inclusive Strange-Baryon Production and Search for Pentaquarks in Two-Photon Collisions at LEP
• Search for the exotic ${\Theta }^{+}$ resonance in the NOMAD experiment
• On influence of experimental resolution on the statistical significance of a signal: implication for pentaquark searches
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Cited by in corpus (10)

• Heavy hadronic molecules with pion exchange and quark core couplings: a guide for practitioners
• Possible studies at the first stage of the NICA collider operation with polarized and unpolarized proton and deuteron beams
• Observation of a narrow structure in p(gamma,K_s)X via interference with phi-meson production
• Quantum interference of particles and resonances
• Vector transition form factors of the $N{K}^{\ast }\to {\Theta }^{+}$ and $N{\bar{K}}^{\ast }\to {\Sigma }_{\overline{10}}^{\ast -}$ in the SU(3) chiral quark-soliton model
• To see the exotic Theta^+ baryon from interference
• Observation of a narrow baryon resonance with positive strangeness formed in $K^{+}$Xe collisions
• Exotic and Non-Exotic Baryon Properties on the Light Cone
• Generalized sine-Gordon model and baryons in two-dimensional QCD
• How is Exotics Produced ? Where to Search for it ?