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arXiv 0810.2258nucl-th
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高温和高密度下φ介子的性质

Properties of the phi meson at high temperatures and densities

G. Vujanovic, J. Ruppert, C. Gale

摘要:

我们用自能与前向散射振幅(FSA)相联系的一般形式计算了在核子和π介子热浴中的φ介子的谱密度。为了描述低能量FSA,我们使用实验数据以及背景项。对于高能量FSA,采用Regge参数化。我们使用色散技术验证所得到的FSA。我们发现谱密度峰值的位置从真空位置稍微移动,并且其宽度大大增加。在150 MeV的温度和正常核密度下的谱密度的宽度大于90 MeV。

英文摘要:

We calculate the spectral density of the phi meson in a hot bath of nucleons and pions using a general formalism relating self-energy to the forward scattering amplitude (FSA). In order to describe the low energy FSA, we use experimental data along with a background term. For the high energy FSA, a Regge parameterization is employed. We verify the resulting FSA using dispersion techniques. We find that the position of the peak of the spectral density is slightly shifted from its vacuum position and that its width is considerably increased. The width of the spectral density at a temperature of 150 MeV and at normal nuclear density is more than 90 MeV.

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