标题： 一个来自红外增强胶子交换的动力学Eta'质量 显示英文标题

标题： A Dynamical Eta'-Mass from an Infrared Enhanced Gluon Exchange

摘要： 赝标单态介子与两个胶子混合。Kogut和Susskind的维度论证表明，如果胶子关联在红外区域增强，这可以在该通道中屏蔽手征极限的戈德斯通极点。使用一个在k^2趋于0时如sigma/k^4般奇异的胶子传播子，我们将屏蔽质量与弦张力sigma联系起来。在描述eta-eta'混合的Witten-Veneziano作用量中，这种关系给出了eta'约810MeV的质量，eta约430MeV的质量，以及从sigma的约0.18GeV^2的实验值得出的约-30度的混合角。弦张力的非常弱的温度依赖性应使这一机制与指数温度依赖的瞬子模型预测在实验上可区分。 显示英文摘要

摘要： The pseudo-scalar flavor-singlet meson mixes with two gluons. A dimensional argument by Kogut and Susskind shows that this can screen the Goldstone pole of the chiral limit in this channel, if the gluon correlations are infrared enhanced. Using a gluon propagator as singular as sigma/k^4 for k^2 -> 0 we relate the screening mass to the string tension sigma. In the Witten-Veneziano action to describe the eta-eta' mixing this relation yields masses of about 810MeV for the eta', 430MeV for the eta and a mixing angle of about -30deg from the phenomenological value for sigma of approx. 0.18GeV^2. The very weak temperature dependence of the string tension should make this mechanism experimentally distinguishable from exponentially temperature dependent instanton model predictions.