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arXiv 1302.3633hep-lat
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在SU(3)夸克-反夸克QCD通量管中:屏蔽与量子加宽

Inside the SU(3) quark-antiquark QCD flux tube: screening versus quantum widening

N. Cardoso, M. Cardoso, P. Bicudo

摘要:

在格点量子色动力学中,色禁闭表现在通量管中。我们详细计算了纯规范SU(3)维$D=3+1$中夸克-反夸克通量管,夸克-反夸克距离R从0.4 fm到1.4 fm。为了提高信噪比,我们采用了改进的多击和扩展涂抹技术。我们详细的规范不变平方分量的色电场和色磁场在静态夸克和静态反夸克之间的调解人平面和平面的源。我们适合的场密度与适当的ansatze,我们观察到在所有研究的平面中的色场的筛选与量子加宽的通量管在调解人平面。所有分量平方的色场是非零的,并且与穿透长度λ ~ 0.22至0.24 fm和有效屏蔽质量μ ~ 0.9至0.8 GeV一致。通量管的量子展宽符合R.

英文摘要:

In lattice QCD, colour confinement manifests in flux tubes. We compute in detail the quark-antiquark flux tube for pure gauge SU(3) dimension $D=3+1$ for quark-antiquark distances R ranging from 0.4 fm to 1.4 fm. To increase the signal over noise ratio, we apply the improved multihit and extended smearing techniques. We detail the gauge invariant squared components of the colour electric and colour magnetic fields both in the mediator plane between the static quark and static antiquark and in the planes of the sources. We fit the field densities with appropriate ansatze and we observe the screening of the colour fields in all studied planes together with the quantum widening of the flux tube in the mediator plane. All components squared of the colour fields are non-vanishing and are consistent with a penetration length lambda ~ 0.22 to 0.24 fm and an effective screening mass mu ~ 0.9 to 0.8 GeV. The quantum widening of the flux tube is well fitted with a logarithmic law in R.

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