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arXiv 1005.4876nucl-th
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纯手征恢复情形下的ρ介子

The rho meson in a scenario of pure chiral restoration

Thomas Hilger, Ronny Thomas, Burkhard Kampfer, Stefan Leupold

摘要:

基于QCD求和规则,我们探讨了ρ介子的纯手征恢复方案的后果,其中所有的手征对称性破缺凝聚体被丢弃,而手征对称凝聚体保持在它们的真空值。这种纯手征恢复方案导致约120 MeV的ρ谱矩下降。讨论了质量移动和加宽的互补性。一个简单的参数化的ρ谱函数导致约600兆电子伏的宽度,如果没有移动的峰值位置被假定。

英文摘要:

Based on QCD sum rules we explore the consequences of a pure chiral restoration scenario for the rho meson, where all chiral symmetry breaking condensates are dropped whereas the chirally symmetric condensates remain at their vacuum values. This pure chiral restoration scenario causes the drop of the rho spectral moment by about 120 MeV. The complementarity of mass shift and broadening is discussed. A simple parametrization of the rho spectral function leads to a width of about 600 MeV if no shift of the peak position is assumed.

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