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arXiv 0801.0303hep-ph
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碰撞参量空间中半硬射流产生的么正性约束

Unitarity Constraints on Semi-hard Jet Production in Impact Parameter Space

T. C. Rogers, A. M. Stasto, M. I. Strikman

摘要:

微扰QCD微喷产生公式是描述高能强子-强子散射总截面和多粒子产生模型的重要组成部分。使用参数的基础上的s-通道的幺正性,我们设置的最小值的p_T的领先扭转微型射流公式可以使用的界限。对于大碰撞参量,部分子之间的相关性似乎很小,我们发现,对于LHC能量,p_T的最小值应大于2.5 GeV,对于宇宙线能量约为50 TeV,p_T的最小值应大于3.5 GeV。我们还认为,碰撞的碰撞参量的值典型的重粒子生产的最小p_T的值很可能是相当大的。我们还分析和量化的饱和效应的胶子密度的潜在作用。我们发现,虽然饱和效应本身不足以恢复么正性,但它们可能在LHC能量下发挥重要作用。

英文摘要:

The perturbative QCD formula for minijet production consitutes an important ingredient in models describing the total cross section and multiparticle production in hadron-hadron scattering at high energies. Using arguments based on s-channel unitarity we set bounds on the minimum value of p_T for which the leading twist minijet formula can be used. For large impact parameters where correlations between partons appear to be small we find that the minimum value of p_T should be greater than 2.5 GeV for LHC energies and greater than 3.5 GeV for cosmic ray energies of about 50 TeV. We also argue that for collisions with values of impact parameters typical for heavy particle production the values of minimum p_T are likely to be considerably larger. We also analyze and quantify the potential role of saturation effects in the gluon density. We find that although saturation effects alone are not sufficient to restore unitarity, they are likely to play an important role at LHC energies.

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