Photoproduction of Theta^+(1540,1/2^+) reexamined with new theoretical information

Details Photoproduction of Theta^+(1540,1/2^+) reexamined with new theoretical information Photoproduction of Theta^+(1540,1/2^+) reexamined with new theoretical information

2009-01-07

arxiv.org/abs/0901.0771v1

Phys.Rev.D79:034031,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 16 figures

Scientific paper

10.1103/PhysRevD.79.034031

We reinvestigate the photoproduction of the exotic pentaquark baryon Theta^+(1540,1/2^+) from the gamma N -> Kbar Theta^+ reaction process within the effective Lagrangian approach, taking into account new theoretical information on the K-N-Theta and K*-N-Theta coupling strengths from the chiral quark-soliton model (chiQSM). We also consider the crossing-symmetric hadronic form factor, satisfying the on-shell condition as well. Due to the sizable vector and tensor couplings for the vector kaon, g_{K* N Theta} and f_{K* N Theta}, which are almost the same with the vector coupling g_{K N Theta} ~ 0.8 for the pseudoscalar kaon, the K*-exchange contribution plays a critical role in the photon beam asymmetries.

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