Analysis of Theta^+ production in K^+Xe collisions

Abstract

The reaction K^+Xe->K^0pX is investigated in a meson-exchange model including rescattering of the secondary protons with the aim to analyze the evidence for the Theta^+(1540) resonance reported by the DIANA collaboration. We confirm that the kinematical cuts introduced by the DIANA collaboration efficiently suppress the background to the K^+n->K^0p reaction which may contribute to the Theta^+(1540) production. We find that these kinematical cuts do not produce a narrow structure in the K^0p effective mass spectra near 1540 MeV. We study the effect of a narrow Theta^+ resonance of both positive and negative parity in comparison with the DIANA data. We show that the K^+Xe->K^0pX calculations without Theta^+ contribution as well as the results obtained with a Theta^+ width of 1 MeV are in comparably good agreement with the DIANA results. More dedicated experiments are called for to establish this exotic baryon resonance.

9 pages, 7 figures

References in corpus (1)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)

Cited by in corpus (20)

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• Improved study of a possible Theta+ production in the pp -> p K0 sigma+ reaction with the COSY-TOF spectrometer
• Search for the Theta(1540)+ pentaquark using kaon secondary interactions at Belle
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• Decay of Theta+ in a quark model
• Room for an S = +1 pentaquark in K^+ - nucleus phenomenology
• Formation of a narrow baryon resonance with positive strangeness in K^+ collisions with Xe nuclei
• KKbar photoproduction from protons
• The effect of the in-medium ${\Theta }^{+}$ pentaquark on the kaon optical potential
• Theta+ formation in inclusive gamma D -> pK- X
• Quark spin content of the proton, hyperon semileptonic decays, and the decay width of the ${\Theta }^{+}$ pentaquark
• Comparative Regge analysis of $\Lambda ,{\Sigma }^0,\Lambda (1520)$ and ${\Theta }^{+}$ production in $\gamma p$, $\pi p$ and $pp$ reactions
• Soft-core meson-baryon interactions. II. $\pi N$ and $K^{+}N$ scattering
• Feasibility study of the $K^{+}d\to K^{0}pp$ reaction for the "${\Theta }^{+}$" pentaquark
• Polarization Observables in $\gamma N\to K\bar{K}N$
• Observation of a narrow baryon resonance with positive strangeness formed in $K^{+}$Xe collisions
• Antikaon angular distributions in the reaction $\gamma d\to K^{-}{\Theta }^{+}p\to K^{-}{K}^{+}np$ near the threshold and the parity of the ${\Theta }^{+}$ pentaquark
• Resonance radiative decays as a tool for its parity determination