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Pentaquark Theta^+ production via gamma N ->K^*bar Theta^+(3/2^(+-))

Seung-Il Nam·Atsushi Hosaka·Hyun-Chul Kim
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Abstract

We study the photoproduction of the exotic pentaquark Theta^+ baryon with the vector kaon, assuming that the quantum numbers of the Theta^+ to be J^P=3/2^(+-) and J^P=1/2^+. Scalar meson kappa(800)-exchange is also taken into account. In contrast with the gamma N -> Kbar Theta^+(3/2^(+-)) process, the large suppression from the proton target is not observed in the total cross sections. We also suggest a method to determine which meson exchange is the most dominant by analyzing the polarizations of incident photon and outgoing K^*. We find that kappa-exchange turns out to be prominent when the polarizations of the photon and K^* are aligned to be parallel, whereas K-exchange does when they are perpendicular to each other.

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Seung-Il Nam, Atsushi Hosaka, Hyun-Chul Kim. 2006-07-04. Pentaquark Theta^+ production via gamma N ->K^*bar Theta^+(3/2^(+-)). https://doi.org/10.1103/physrevc.74.025204

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