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arXiv 1401.1973hep-phnucl-ex
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在LHC质子-质子碰撞几何中和几何之外多粒子产生中的喷流

Jets in multiparticle production in and beyond geometry of proton-proton collisions at the LHC

M. Yu. Azarkin, I. M. Dremin, M. Strikman

摘要:

CMS在7 TeV质子-质子相互作用中的高多重性射流和相关事件的特性的实验结果被解释为小碰撞参量的中心碰撞的作用越来越大的指示。我们发现一个迹象表明,CMS和ALICE观察到的不同的硬过程的速率普遍依赖于潜在的事件带电粒子多重性,直到它成为四倍以上的平均水平。结果表明,碰撞质子的重叠面积的增加是不足以解释的事件中的喷流生产率的带电粒子的多重性高于平均值的3倍,一些新的机制是必要的,如质子的相互作用,在罕见的配置高于平均胶子密度。这种机制不包括在本Monte Carlo事件发生器中。提出了进一步的研究建议

英文摘要:

Experimental findings of CMS on properties of jets and underlying events at high multiplicities in proton-proton interactions at 7 TeV are interpreted as an indication of increasing role of central collisions with small impact parameters. We find an indication that the rates of different hard processes observed by CMS and ALICE universally depend on underlying event charged-particles multiplicity until it becomes four times more than average. It is shown that the increase of the overlap area of colliding protons is not sufficient for explanation of the rate of jet production in events with charged-particle multiplicity three times higher than average and some new mechanisms are necessary like interaction of protons in rare configurations of higher than average gluon density. Such mechanisms are not included in the present Monte Carlo event generators. Further studies are proposed

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