g_(ρππ)与有限温度有限宽度有限能量求和规则

g_(ρππ) in Finite-Width Finite Energy Sum Rule at Finite Temperature

基于量子色动力学有限能量求和规则,分别在零温和有限温度情形下研究了介子有限宽度对于ρππ耦合常数的影响.计算结果发现不仅在温度T=0和T≠0时,ρ介子的有限宽度对于gρππ有显著影响,而且当温度接近手征对称性恢复的临界温度时,π-介子的有限宽度对于gρππ(Q2,T,Γρ,Γπ)亦有重大影响.

In the framework of the finite-energy quantum chromodynamics sum rule, the effect of the finite-width of the mesons to the ρππ-coupling constant is investigated at zero and finite temperature respectively. It is found that not only the finite-width of the ρmeson has the notable influence to the values of gρππ both at T=0 and T≠0, but also it does the π meson at the temperature near the critical one for restoration of chiral symmetry.