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arXiv 0806.2949hep-ph
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从Tevatron到LHC的基本事件和总截面

The Underlying Event and the Total Cross Section from Tevatron to the LHC

Manuel Bähr, Jonathan M. Butterworth, Michael H. Seymour

摘要:

多重部分子相互作用被广泛用于模拟高能强子碰撞中的强子末态,并成功地描述了数据的许多特征。重要的是要最大限度地利用现有的物理约束,特别是考虑到从目前的高能数据到大型强子对撞机能量的大量外推。在程函模型中,多部分子相互作用的速率与总截面的能量相关性相耦合。使用这样一个模型的蒙特卡罗实现,我们研究的总截面,射流截面,和潜在的事件之间的连接。通过对模型施加内部一致性,我们推导出LHC对其参数的约束。通过对模型施加内部一致性并与当前数据进行比较,我们限制了其参数的允许范围。我们表明,在大型强子对撞机的总质子质子截面的测量很可能会打破这种内部的一致性,从而需要扩展的模型。很可能这样的扩展是硬散射探头内的质子在碰撞参量空间比软散射,一个结论也支持Tevatron数据的双部分子散射,和/或模型的基本参数是能量依赖的密度物质分布。

英文摘要:

Multiple partonic interactions are widely used to simulate the hadronic final state in high energy hadronic collisions, and successfully describe many features of the data. It is important to make maximum use of the available physical constraints on such models, particularly given the large extrapolation from current high energy data to LHC energies. In eikonal models, the rate of multiparton interactions is coupled to the energy dependence of the total cross section. Using a Monte Carlo implementation of such a model, we study the connection between the total cross section, the jet cross section, and the underlying event. By imposing internal consistency on the model, we derive constraints on its parameters at the LHC. By imposing internal consistency on the model and comparing to current data we constrain the allowed range of its parameters. We show that measurements of the total proton-proton cross-section at the LHC are likely to break this internal consistency, and thus to require an extension of the model. Likely such extensions are that hard scatters probe a denser matter distribution inside the proton in impact parameter space than soft scatters, a conclusion also supported by Tevatron data on double-parton scattering, and/or that the basic parameters of the model are energy dependent.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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