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We investigate the dependences of the s-wave meson-baryon scattering amplitudes on dierent regularizations within the framework of the chiral unitary model. We employ two dierent regularization schemes, i.e., dimensional and form-factor regularizations, to tame the divergences in the model. We also use those regularization schemes to study the analytic structures of the T-matrices. We nd that while the form-factor regularizaion produces almost the same results as the dimensional regularization does, the on-shell approximation is to some extent limited in the case of the form-factor regularization. Having chosen parameters properly, we show that the regularization dependences can be minimized.
<P>We investigate the photoproduction of the A(1405) equivalent to A* hyperon resonance, i.e., gamma p -> K(+)A*, employing the effective Lagrangian approach with the t-channel Regge trajectories at tree level. We extensively explore the effects from the nucleon resonances in the vicinity of the threshold root s(th) approximate to 1900 MeV, i.e., N* (2000), N* (2030), N* (2055), N* (2095), and N* (2100), and observe that they are of great importance to reproduce the recent CLAS experimental data. Total and differential cross sections are given as numerical results and compared with the experimental data, in addition to the photon- beam asymmetry. The invariant-mass distributions for gamma p -> K+ pi(0)Sigma(0) via A* are also extracted from the two-body process results, showing a qualitative agreement with the data. We also discuss the constituent-counting rule for the internal structure of A* resulting in that A* appears to be different from a simple three-quark (uds) state.</P>
<P>Assuming the four-quark structure for the X resonances in the low-lying region, we calculate their masses using the color-spin interaction. Specifically, the hyperfine masses of the color-spin interaction are calculated for the possible states in spin-0, spin-1, spin-2 channels. The two states in spin-0 channel as well as the two states in spin-1 channel are diagonalized in order to generate the physical hyperfine masses. By matching the difference in hyperfine masses with the splitting in corresponding hadron masses and using the X(3872) mass as an input, we estimate the masses corresponding to the states J(PC) = 0(++), 1(+-), 2(++). We find that the masses of two states in 1(+-) are close to those of X(3823), X(3900), and the mass of the 2(++) state is close to that of X(3940). For them, the discrepancies are about similar to 10MeV. This may suggest that the quantum numbers of the controversial states are X(3823) = 1(+-), X(3900) = 1(+-), X(3940) = 2(++). In this work, we use the same inputs parameters, the constituent quark masses and the strength of the color-spin interaction, that have been adopted in the previous work on the D- or B-meson excited states. There, it was shown that the four-quark structure can be manifested in their excited states. Thus, our results in this work provide a consistent treatment on open-and hidden-charm mesons as far as the four-quark model is concerned.</P>