The underlying event and the total cross section from Tevatron to the LHC

The underlying event and the total cross section from Tevatron to the LHC
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基础事件和从 Tevatron 到 LHC 的总横截面

DOI:
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发表时间:
2008
期刊:
影响因子:
--
通讯作者:
M. Seymour
M. Seymour
中科院分区:
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文献类型:
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作者:
M. Bahr;J. Butterworth;M. Seymour

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多重粒子相互作用被广泛用于模拟高能强子碰撞中的强子终态,并成功描述了数据的许多特征。最大限度地利用此类模型的可用物理约束非常重要,特别是考虑到从当前高能数据到大型强子对撞机能量的大量外推。在 eikonal 模型中,多部分相互作用的速率与总横截面的能量依赖性耦合。使用此类模型的蒙特卡罗实现,我们研究了总横截面、射流横截面和基础事件之间的联系。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,大型强子对撞机上总质子-质子截面的测量可能会打破这种内部一致性,因此需要扩展模型。可能的这种扩展是,硬散射在撞击参数空间中探测到质子内部比软散射更密集的物质分布,这一结论也得到了有关双部分子散射的 Tevatron 数据的支持,和/或模型的基本参数与能量相关。
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 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.
Herwig 2.2 发行说明
DOI: 10.48550/arxiv.0804.3053
发表时间: 2008
期刊: arXiv e-prints
影响因子: --
作者:
Bahr M.
通讯作者: Bahr M.
DOI: 10.1140/epjc/s10052-008-0610-x
发表时间: 2007-11
期刊: The European Physical Journal C
影响因子: --
作者:
A. Sherstnev;R. Thorne
通讯作者: A. Sherstnev;R. Thorne