Jun 13 – 17, 2011
Europe/Berlin timezone
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Mixing properties of a1(1260) meson consisting of hadronic composite and quark composite

Jun 17, 2011, 10:20 AM
Festsaal (Künstlerhaus)



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Prof. Hideko Nagahiro (Nara Women's University)


We propose a practical method to clarify the mixing nature of hadrons consisting of multiple components having different origins, by demonstrating an analysis of the a1(1260) meson [1]. One of recent interests in hadron structure is whether hadrons are made up of quarks as described in the conventional quark model, or develop subcomponents of quark-clusters inside. One good example is provided by the a1(1260) axial vector meson. The a1 meson is a candidate of the chiral partner of the rho meson and can also appear as a gauge boson of the hidden local symmetry [2], which is recently reconciled in the holographic QCD [3]. On the other hand, in coupled-channel approaches based on the chiral effective theory, the a1 meson has been described as a dynamically generated resonance in the pi-rho scattering [4,5]. In this study, we regard the a1 meson as a mixed state of the quark-composite (we refer to it as the elementary component) and the hadronic composite and propose a method to disentangle their mixture appearing in the physically observed state. As an extension, we apply our method to the study of the large Nc behavior of the a1 state and discuss the limitation of the classification for such a mixed state. [1] H. Nagahiro, K. Nawa, S. Ozaki, D. Jido, A. Hosaka, e-print arXiv:1101.3623 [hep-ph]. [2] M. Bando, T. Kugo, and K. Yamawaki, Phys. Rept. 164(1988)217. [3] T. Sakai, and S. Sugimoto, Prog. Theor. Phys. 114(2005)1083. [4] L. Roca, E. Oset, and J. Singh, Phys. Rev. D72(2005)014002. [5] M. F. M. Lutz, and E. E. Kolomeitsev, Nucl. Phys. A730(2004)392.

Primary author

Prof. Hideko Nagahiro (Nara Women's University)


Prof. Atsushi Hosaka (RCNP, Osaka Univ.) Prof. Daisuke Jido (YITP, Kyoto Univ.) Dr Kanabu Nawa (RCNP, Osaka Univ.) Dr Sho Ozaki (RCNP, Osaka Univ.)

Presentation materials