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arXiv 0707.2844hep-ph
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有限温度下的重-轻夸克赝标和矢量介子

Heavy-light quark pseudoscalar and vector mesons at finite temperature

C. A. Dominguez, M. Loewe, J. C. Rojas

摘要:

在热希尔伯特矩QCD求和规则的框架下,得到了重-轻夸克赝标介子和矢量介子的质量、轻子衰变常数和宽度与温度的关系。赝标和矢量介子的轻子衰变常数随$T$的增加而减小,并在临界温度$T_c$处消失,而介子的宽度急剧增加,并在$T_c$处发散,其中$T_c$是手征对称性恢复的温度。这些结果表明强子从谱函数中消失,谱函数变成能量的光滑函数。这被解释为在$T=T_c$的去封闭信号。相比之下,质量对温度的依赖性很小,除了非常接近$T_c$,其中赝标介子质量略微增加10- 20%,矢量介子质量减少约20-30

英文摘要:

The temperature dependence of the mass, leptonic decay constant, and width of heavy-light quark peseudoscalar and vector mesons is obtained in the framework of thermal Hilbert moment QCD sum rules. The leptonic decay constants of both pseudoscalar and vector mesons decrease with increasing $T$, and vanish at a critical temperature $T_c$, while the mesons develop a width which increases dramatically and diverges at $T_c$, where $T_c$ is the temperature for chiral-symmetry restoration. These results indicate the disappearance of hadrons from the spectral function, which then becomes a smooth function of the energy. This is interpreted as a signal for deconfinement at $T=T_c$. In contrast, the masses show little dependence on the temperature, except very close to $T_c$, where the pseudoscalar meson mass increases slightly by 10-20 %, and the vector meson mass decreases by some 20-30 %

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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