Novel Collective Excitations and the Quasi-Particle Picture of Quarks Coupled with a Massive Boson at Finite Temperature(Nuclear Physics)
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概要
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Motivated by the observation that there may exist hadronic excitations even in the quark-gluon plasma (QGP) phase, we investigate how the properties of quarks, especially within the quasi-particle picture, are affected by the coupling with bosonic excitations at finite temperature (T), employing Yukawa models with a massive scalar (pseudoscalar) and vector (axial-vector) boson of mass m. The quark spectral function and the quasi-dispersion relations are calculated at one-loop order. We find that there appears a three-peak structure in the quark spectral function with a collective nature when T is comparable with m, irrespective of the type of boson considered. Such a multi-peak structure was first found in a chiral model yielding scalar composite bosons with a decay width. We elucidate the mechanism through which the new quark collective excitations are realized in terms of the Landau damping of a quark (an antiquark) induced by scattering with the thermally excited boson, which gives rise to mixing and hence a level repulsion between a quark (antiquark) and an antiquark-hole (quark-hole) in the thermally excited antiquark (quark) distribution. Our results suggest that the quarks in the QGP phase can be described within an interesting quasi-particle picture with a multi-peak spectral function. Because the models employed here are rather generic, our findings may represent a universal phenomenon for fermions coupled to a massive bosonic excitation with a vanishing or small width. The relevance of these results to other fields of physics, such as neutrino physics, is also briefly discussed. In addition, we describe a new aspect of the plasmino excitation obtained in the hard-thermal loop approximation.
- 理論物理学刊行会の論文
- 2007-01-25
著者
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KUNIHIRO Teiji
Faculty of Natural Science, Ryukoku University
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Kunihiro T
Yukawa Institute For Theoretical Physics Kyoto University:(present Office)department Of Physics Kyot
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Kunihiro Teiji
Yukawa Institute For Theoretical Physics Kyoto Univ.
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Nemoto Yukio
Department Of Physics Nagoya University
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KITAZAWA Masakiyo
Department of Physics, Osaka University
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KITAZAWA Masakiyo
RIKEN-BNL Reseach Center, Brookhaven National Laboratory
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KITAZAWA Masakiyo
Yukawa Institute for Theoretical Physics, Kyoto University
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NEMOTO Yukio
RIKEN-BNL Research Center
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Tamiya Kyuichiro
Department Of Physics Kyoto University
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Kitazawa Masakiyo
Department Of Physics Osaka University
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NEMOTO Yukio
Department of Physics, Nagoya University
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NEMOTO Yukio
RIKEN BNL Research Center
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KITAZAWA Masakiyo
RIKEN-BNL Research Center, Brookhaven National Laboratory
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