Radiative decays of the low lying axial-vector mesons

por Hideko Nagahiro (Research Center for Nuclear Physics, Osaka University)

viernes 7 mar. 2008 12:00 → 13:00 Europe/Madrid

Sala Seminarios IFIC (Edf. Institutos de Investigación)

We evaluate the radiative decay widths into a pseudo-scalar meson and a photon of the low lying axial vector mesons, a1(1260), b1(1235), h1(1170), h1(1380), f1(1285) and K1(1270) [1,2], which are dynamically generated from the vector-pseudoscalar interaction with the Chiral Unitary approach. [3] Especially, in the Chiral Unitary approach, two K1(1270) resonances were found [3,4] in analogy with the two poles of the Lambda(1405). We would like to discuss that, if one considers the doublet pole structure of K1 in the experimental analysis of the radiative decay, the obtained experimental result in Ref.[5] could be changed. We also propose a related experiment in order to obtain new information on the issue of the two pole structure of the K1(1270). References: [1] H. Nagahiro, L. Roca and E. Oset, Phys.Rev.D submitted. [2] L. Roca, A. Hosaka and E. Oset, Phys.Lett.B658,17-26 (2007). [3] L. Roca, E.Oset and J. Singh, Phys.Rev.D72,014002 (2005). [4] L.S. Geng, E. Oset, L. Roca, J.A. Oller, Phys.Rev.D75,014017 (2007). [5] A. Alavi-Harati et al., Phys.Rev.Lett.89,072001 (2002).