Vector transition form factors of the image and image in the image chiral quark–soliton model Original Research Article

We investigate the vector transition form factors of the nucleon and vector meson K∗ to the pentaquark baryon Θ+ within the framework of the SU(3) chiral quark–soliton model. We take into account the rotational 1/Nc and linear ms corrections, assuming isospin symmetry and employing the symmetry-conserving quantization. It turns out that the leading-order contributions to the form factors are almost cancelled by the rotational corrections. Because of this, the flavor SU(3) symmetry-breaking terms yield sizeable effects on the vector transition form factors. In particular, the main contribution to the electric-like transition form factor comes from the wave-function corrections, which is a consequence of the generalized Ademollo–Gatto theorem derived in the present work. We estimate with the help of the vector meson dominance the K∗ vector and tensor coupling constants for the Θ+: gK∗NΘ=0.74–0.87 and fK∗NΘ=0.53–1.16. We argue that the outcome of the present work is consistent with the null results of the CLAS experiments in the reactions γn→K−Θ+ and View the MathML source. The results of the present work are also consistent with the recent experiments at KEK. In addition, we present the results of the View the MathML source transition form factors and its View the MathML source coupling constants.