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arXiv 0710.0174hep-lat
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Nf=2 QCD中一阶标度的检验

A test of first order scaling in Nf=2 QCD

G. Cossu, M. D'Elia, A. Di Giacomo, C. Pica

摘要:

我们完成了我们的分析Nf=2 QCD基于格点交错费米子的提法。使用一系列固定(amq*Ls^yh)的蒙特卡罗模拟,能够测试具有给定临界指数yh的普适类。这个策略已经被用来测试O(4)普适类,并且已经在以前的Lattice会议上提出过。在质量范围amq=[0.01335,0.15]中,使用Ls=16至32且Lt=4的晶格,未发现与模拟一致。用同样的策略,我们现在研究一级跃迁的可能性,使用一组新的Monte Carlo数据,对应于yh=3,在与O(4)相同的质量和体积范围内。在比热定标和手性缩合物的定标中观察到实质性的一致性,而手性亲合性在探索的质量范围内仍然呈现出与定标的可见偏差。

英文摘要:

We complete our analysis of Nf=2 QCD based on the lattice staggered fermion formulation. Using a series of Monte Carlo simulations at fixed (amq*Ls^yh) one is able to test the universality class with given critical exponent yh. This strategy has been used to test the O(4) universality class and it has been presented at the previous Lattice conferences. No agreement was found with simulations in the mass range amq=[0.01335,0.15] using lattices with Ls=16 up to 32 and Lt=4. With the same strategy, we now investigate the possibility of a first order transition using a new set of Monte Carlo data corresponding to yh=3 in the same mass and volume range as the one used for O(4). A substantial agreement is observed both in the specific heat scaling and in the scaling of the chiral condensate, while the chiral susceptibilities still presents visible deviation from scaling in the mass range explored.

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