Pentaquark ${\Theta }^{+}$ production from the reaction $\gamma p\to {\pi }^{+}{K}^{-}{\Theta }^{+}$

Abstract

The cross section for ${\Theta }^{+}$ production from the reaction $\gamma p\to {\pi }^{+}{K}^{-}{\Theta }^{+}$, which was observed in the CLAS experiment at the Jefferson National Laboratory, is evaluated in a hadronic model that includes couplings of ${\Theta }^{+}$ to both $KN$ and $K^{\ast }N$. With their coupling constants determined from the empirical $\pi NN(1710)$ and $\rho NN(1710)$ coupling constants using the SU(3) symmetry, the cross section for this reaction has been evaluated by taking ${\Theta }^{+}$ to have spin 1/2 and isospin 0 but either positive or negative parity. We find that the cross section is 10-15 nb if ${\Theta }^{+}$ has positive parity as predicted by the chiral soliton model. The cross section is reduced by more than a factor of 10 if ${\Theta }^{+}$ has negative parity as given by lattice QCD studies. For both parities, the differential distribution peaks at small negative four momentum transfer as expected from the dominating $t$-channel kaon-exchange diagram that involves only the coupling of ${\Theta }^{+}$ to $KN$.

15 pages, 7 figures

References in corpus (11)

• Pentaquark hadrons from lattice QCD
• K+ nucleon scattering and exotic S=+1 Baryons
• Understanding Pentaquark States in QCD
• Pentaquark in the Skyrme Model
• Phenomenology of the Pentaquark Antidecuplet
• Influence of a Z+(1540) resonance on K+N scattering
• Are ${\Theta }^{+}$ and the Roper resonance diquark-diquark-antiquark states?
• Pentaquark states in a chiral potential
• ${\Theta }^{+}$ in a chiral constituent quark model and its interpolating fields
• Photoproduction of Theta baryon from the neutron
• Cross sections for pentaquark baryon production from protons in reactions induced by hadrons and photons

Cited by in corpus (22)

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• Pentaquark Theta^+(1540) production in gamma N --> K Anti-K N
• Pentaquark baryons in SU(3) quark model
• Coherent Theta^+ and Lambda(1520) photoproduction off the deuteron
• Magnetic moments of antidecuplet pentaquarks
• On the determination of the parity of the ${\Theta }^{+}$
• Investigating the parity of the exotic Theta^+ baryon from the kaon photoproduction
• Generalized baryon form factors and proton structure functions in the Sakai-Sugimoto model
• Pentaquark baryon production from photon-neuteron reactions
• Spin asymmetries in gamma + N --> K*bar + Theta^+
• Comparative Regge analysis of $\Lambda ,{\Sigma }^0,\Lambda (1520)$ and ${\Theta }^{+}$ production in $\gamma p$, $\pi p$ and $pp$ reactions
• Threshold production of the ${\Theta }^{+}$ in a polarized proton reaction
• Photoproduction of pentaquark cascades from nucleons
• K*-couplings for the antidecuplet excitation
• Some aspects of ${\Theta }^{+}$ parity determination in the reaction $\gamma N\to {\Theta }^{+}\bar{K}\to NK\bar{K}$
• Production of the pentaquark ${\Theta }^{+}$ in $np$ scattering
• Photoproduction of Pentaquark in Feynman and Regge Theories
• 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
• Angular distribution and azimuthal asymmetry for pentaquark production in proton-proton collisions