arXiv 0810.28072008-10-15hep-phnucl-th

喷注形状和截面理论：从强子到核

A theory of jet shapes and cross sections: from hadrons to nuclei

Ivan Vitev, Simon Wicks, Ben-Wei Zhang

备注：: 20 pages, 15 ps and eps figures
发表信息：: JHEP 0811:093,2008
DOI：: 10.1088/1126-6708/2008/11/093

摘要：

对于喷气式飞机来说，强大的动力带来了巨大的机会。LHC提供的前所未有的质心能量为QGP打开了新的窗口：我们证明了喷流形状和喷流截面测量作为基础QCD理论的新的、差分的和精确的测试是可行的。我们提出了理解这些形状和截面在重离子反应的第一步。我们的方法允许详细模拟实验接受/切割，帮助隔离在这样的高多重性环境中的射流。它是第一次表明，受激胶子发射的模式可以与可变淬火的喷流率，并提供了一个近似模型无关的方法来确定介质诱导韧致辐射谱的特性。令人惊讶的是，在现实的模拟部分子传播通过QGP，我们发现一个最小的平均射流半径的增加，即使大喷流衰减。喷流加宽表现在远离喷流轴的能量分布的尾部，其量化需要在LHC上可能的高统计测量。

英文摘要：

For jets, with great power comes great opportunity. The unprecedented center of mass energies available at the LHC open new windows on the QGP: we demonstrate that jet shape and jet cross section measurements become feasible as a new, differential and accurate test of the underlying QCD theory. We present a first step in understanding these shapes and cross sections in heavy ion reactions. Our approach allows for detailed simulations of the experimental acceptance/cuts that help isolate jets in such high-multiplicity environment. It is demonstrated for the first time that the pattern of stimulated gluon emission can be correlated with a variable quenching of the jet rates and provide an approximately model-independent approach to determining the characteristics of the medium-induced bremsstrahlung spectrum. Surprisingly, in realistic simulations of parton propagation through the QGP we find a minimal increase in the mean jet radius even for large jet attenuation. Jet broadening is manifest in the tails of the energy distribution away from the jet axis and its quantification requires high statistics measurements that will be possible at the LHC.

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英文摘要：

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