arXiv 0911.48692009-11-25hep-lat

有限温度下的纯规范胶球

Pure gauge glueballs at finite temperature

The CLQCD Collaboration, X. -F. Meng, G. Li, Y. Chen, C. Liu, Y. -B. Liu, J. -P. Ma, J. -B. Zhang

备注：: Lattice2009, 8 pages, 5 figures
发表信息：: PoS LAT2009:187,2009

摘要：

研究了各向异性晶格上从$0.3T_c$到$1.9T_c$的大温度范围内的有限温度纯规范胶球.优化的胶球算子用于获得更好的信号。发现在所有20个对称通道中，胶球的极质量$M_G$在温度从下面接近临界温度$T_c$时几乎保持不变，当温度高于$T_c$时，胶球的极质量开始逐渐减小.基于Breit-Wigner模型，通过假设热宽度$Γ$对应于极质量$ω_0$，分析了$0^{++}$、$0^{-+}$和$2^{++}$通道中的胶球散射子.虽然$ω_0$在整个温度范围内对$T$不敏感，但$Γ$在低于和高于$T_c$时表现出不同的行为：当$T<T_c$时，它们仅是$ω_0$的少数替代物，但当$T>T_c$时，它们突然生长，并在$T\approx 1.9T_c$达到大致$Γ\sim ω_0/2$的值.

英文摘要：

Pure gauge glueballs at finite temperature are investigated in a large temperature range from $0.3T_c$ to $1.9T_c$ on anisotropic lattices. Optimized glueball operators are used to obtain better signals. It is found in all 20 symmetry channels that the pole masses $M_G$ of glueballs remain almost constants when the temperature approaches the critical temperature $T_c$ from below, and start to reduce gradually with the temperature going above $T_c$. The glueball correlators in $0^{++}$, $0^{-+}$, and $2^{++}$ channels, are also analyzed based on the Breit-Wigner ansatz by assuming a thermal width $Γ$ to the pole mass $ω_0$. While $ω_0$'s are insensitive to $T$ in the whole temperature range, $Γ$'s exhibit distinct behavior below and above $T_c$: They are only few percents of $ω_0$ when $T<T_c$, but grow abruptly when $T>T_c$ and reach values of roughly $Γ\sim ω_0/2$ at $T\approx 1.9T_c$.

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摘要：

英文摘要：

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