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EPJ A - Hadrons and Nuclei
Hadrons and Nuclei


Eur. Phys. J. A 14, 87-93 (2002)
DOI: 10.1140/epja/iepja1273

A role of the axial-vector mesons on the photon production in heavy-ion collisions and their relevant decays

Y.C. Shin1, M.K. Cheoun2, K.S. Kim3 and T.K. Choi4

1  Cyclotron Application Laboratory, Korea Cancer Center Hospital, Seoul, 139-706, Korea
2  IUCNSF, Building 139-1, Seoul National University, Seoul, 151-742, Korea
3  BK21 Physics Research Division and Institute of Basic Science, Sung Kyun Kwan University, Suwon, 440-746, Korea
4  Department of Physics, Yonsei University, Wonju, 220-710, Korea

cheoun@phya.snu.ac.kr

(Received: 8 August 2001 / Revised version: 14 January 2002 Communicated by A Schäfer)

Abstract
A role of the axial-vector mesons, such as K1 and a1, on the emitted-photon spectrum in hot hadronic matter is studied through the channels $\pi \rho \rightarrow a_1 \rightarrow \pi \gamma$ and $K \rho \rightarrow K_1 \rightarrow K \gamma$. Both channels could be dominant over the region lower than $E_{\gamma} \sim $ 0.5 GeV, while the role of the K1 meson is diminished in the higher $E_{\gamma}$ region. This study is carried out with an $SU_{L}(3)\otimes SU_{R}(3)$ effective chiral Lagrangian which includes vector and axial-vector mesons systematically and explains well their hadronic and radiative decays simultaneously.

PACS
13.25.Jx - Decays of other mesons.
13.30.Eg - Hadronic decays.
25.75.Dw - Particle and resonance production.
25.70.-z - Low and intermediate energy heavy-ion reactions.

© Società Italiana di Fisica, Springer-Verlag 2002

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