Theta+ formation in inclusive gamma D -> pK- X

Abstract

We analyze the possibility to produce an intermediate Theta^+ via a KN->Θ+ formation process in gamma D-> pK^- X (X=nK^+,pK^0) reactions at some specific kinematical conditions, in which a pK^- pair is knocked out in the forward direction and its invariant mass is close to the mass of Lambda(1520). The Θ^+ signal may appear in the [γD,pK^-] missing mass distribution. The ratio of the signal (cross section at the Θ^+ peak position) to the smooth background processes varies from 0.7 to 2.5 depending on the spin and parity of Theta+, and it decreases correspondingly if the pK^- invariant mass is outside of the Lambda(1520)-resonance region. We analyze the recent CLAS search for the Theta+ in the gamma D ->pK^-nK^+ reaction and show that the conditions of this experiment greatly reduce the Theta+ formation process making it difficult to extract a Theta+ peak from the data.

arXiv comment40 pageg, 26 figures

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Cited by in corpus (7)

• Evidence of the Θ^+ in the γd \to K^+K^-pn reaction
• Differential Photoproduction Cross Sections of the Sigma0(1385), Lambda(1405), and Lambda(1520)
• The role of the $N^{\ast }(2080)$ resonance in the $\vec{\gamma }p\to K^{+}\Lambda (1520)$ reaction
• Near-threshold photoproduction of $\Lambda (1520)$ from protons and deuterons
• Re-analysis of the $\Lambda (1520)$ photoproduction reaction
• Investigation of the reaction pp->p K0 pi+ Lambda in search of the pentaquark
• To see the exotic Theta^+ baryon from interference