Title: Radiative decay into $\gamma$-baryon decuplet of dynamically generated resonances within the hidden gauge formalism
Authors:Bao-Xi Sun and E. Oset
Abstract:
We have studied the radiative decay into $\gamma B$, with $B$ a baryon of the decuplet of SU(3), of the dynamically generated
resonances obtained within the framework of the local hidden gauge mechanism for vector interactions. The framework is particularly
rewarding for the study of such observable, since the photon in the final state appears coupling directly to the vector
$V= \rho^0, \omega, \phi$ in the $R \to V$ amplitudes which are studied in previous works. The results obtained are very interesting. First
the rates obtained are large and the radiative widths are of the order of $1~MeV$. On the other hand, one of the appealing features of the results is the large difference, of about one order of magnitude, that one finds between the widths for different charge states of the same particle. These results are tied to details of the theory, concretely the coupling of the resonance to $ V~B$, which sometimes produce large interferences between the different contributions of the three vector mesons to which the photon couples. As a consequence the radiative decay widths that we have evaluated bare much information on the nature of those resonances which should justify efforts
for a systematic measurement of these observables. We hope the present work stimulates work in this direction.
References:
[1] P. Gonzalez, E. Oset and J. Vijande, Phys Rev. C, in print. arXiv:0812.3368 [hep-ph].
[2] S. Sarkar, B. X. Sun, E. Oset and M. J. V. Vacas, arXiv:0902.3150 [hep-ph].
|