arXiv 1301.28642013-01-14hep-lathep-phhep-thnucl-th

UV胶子的弦激发和作用的格点量子色动力学研究

Lattice QCD study for stringy excitation and role of UV gluons

Hiroshi Ueda, Takahiro M. Doi, Sho Fujibayashi, Shoichiro Tsutsui, Takumi Iritani, Hideo Suganuma

备注：: Talk given at Conference: Quark Confinement and the Hadron Spectrum X

摘要：

在夸克-反夸克（Q-Qbar）和三夸克（3Q）两种情况下，我们研究了SU（3）猝灭格点量子色动力学中库仑规范中胶子动量分量对基态势和低激发态势的影响。通过在胶子动量空间中引入紫外截断，我们定量地研究了基态势和激发态势的紫外胶子敏感性。这种非夸克起源的激发是一种纯胶子激发，在强子的彩色通量管图像中可以解释为弦激发。对于Q-Qbar和3Q系统，即使在切断高动量胶子分量后，基态势的IR部分几乎不变。另一方面，我们发现紫外胶子的切割对激发态势的影响更为显著。然而，即使除去了紫外胶子，低位胶子激发的量级仍然是1GeV。

英文摘要：

In both cases of quark-antiquark (Q-Qbar) and three-quark (3Q) systems, we study ground-state and low-lying excited-state potentials in terms of the gluon-momentum component in the Coulomb gauge in SU(3) quenched lattice QCD. By introducing UV-cut in the gluon-momentum space, we investigate the "UV-gluon sensitivity" of the ground-state and excited-state potentials quantitatively. Such a non-quark-origin excitation is a purely gluonic excitation, which can be interpreted as a stringy excitation in the color flux-tube picture of hadrons. For both Q-Qbar and 3Q systems, the IR part of the ground-state potential is almost unchanged, even after cutting off high-momentum gluon component. On the other hand, we find more significant change of excited-state potential by the cut of UV-gluons. However, even after the removal of UV-gluons, the magnitude of the low-lying gluonic excitation remains to be of the order of 1GeV.

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摘要：

英文摘要：

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