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arXiv 2103.16573hep-phhep-exnucl-exnucl-th
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引导射流和能量损失

Leading jets and energy loss

Duff Neill, Felix Ringer, Nobuo Sato

摘要:

前沿喷流的形成和演化可以用满足非线性DGLAP型演化方程的喷流函数来描述。不同于包容性射流,领先的射流功能构成归一化的概率密度领先的射流携带相对于初始碎裂部分子的纵向动量分数。我们提出了一个部分子簇射算法,它允许计算领先的射流截面的射流半径和阈值的单位面积的单位面积的次领先的对数(NLL $'$)的准确性。通过计算领先的射流分布的平均值,我们能够量化的平均射流外辐射,所谓的射流能量损失。当测量一个附加的参考标度时,我们能够确定在截面水平上的引导喷流的能量损失,这与在引导对数精度下的部分子能量损失相同。我们确定了几个合适的截面提取的射流能量损失,我们目前的数值结果领先subjets在大型强子对撞机。此外,我们认为半球和事件范围内的领先射流在电子正电子湮没类似的测量在LEP。除了平均能量损失,我们还考虑了它的方差和其他统计量,如KL散度,量化夸克和胶子喷注能量损失之间的差异。我们希望我们的结果将是特别相关的量化夸克和胶子喷流,通过热或冷核物质传播的能量损失。

英文摘要:

The formation and evolution of leading jets can be described by jet functions which satisfy non-linear DGLAP-type evolution equations. Different than for inclusive jets, the leading jet functions constitute normalized probability densities for the leading jet to carry a longitudinal momentum fraction relative to the initial fragmenting parton. We present a parton shower algorithm which allows for the calculation of leading-jet cross sections where logarithms of the jet radius and threshold logarithms are resummed to next-to-leading logarithmic (NLL$'$) accuracy. By calculating the mean of the leading jet distribution, we are able to quantify the average out-of-jet radiation, the so-called jet energy loss. When an additional reference scale is measured, we are able to determine the energy loss of leading jets at the cross section level which is identical to parton energy loss at leading-logarithmic accuracy. We identify several suitable cross sections for an extraction of the jet energy loss and we present numerical results for leading subjets at the LHC. In addition, we consider hemisphere and event-wide leading jets in electron-positron annihilation similar to measurements performed at LEP. Besides the average energy loss, we also consider its variance and other statistical quantities such as the KL divergence which quantifies the difference between quark and gluon jet energy loss. We expect that our results will be particularly relevant for quantifying the energy loss of quark and gluon jets that propagate through hot or cold nuclear matter.

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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