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arXiv 1209.6086hep-phhep-exnucl-ex
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重离子碰撞中的喷注碎裂函数矩

Jet Fragmentation Function Moments in Heavy Ion Collisions

Matteo Cacciari, Paloma Quiroga-Arias, Gavin P. Salam, Gregory Soyez

摘要:

在重离子碰撞中,射流破碎的性质有可能揭示射流淬灭的机理。然而,巨大的潜在事件的存在复杂的喷流碎裂函数的重建作为喷流中的强子的动量分数z的函数。在这里,我们建议使用的时刻的碎片功能。这些量似乎对淬灭修饰和直接在z中的片段化函数一样敏感。我们表明,他们是适合使用相同的喷气面积为基础的技术在过去提出的喷气p_t的背景减法。此外,由于背景波动对射流的p_t和其颗粒含量的贡献之间的相关性而引起的复杂性很容易被校正。

英文摘要:

The nature of a jet's fragmentation in heavy-ion collisions has the potential to cast light on the mechanism of jet quenching. However the presence of the huge underlying event complicates the reconstruction of the jet fragmentation function as a function of the momentum fraction z of hadrons in the jet. Here we propose the use of moments of the fragmentation function. These quantities appear to be as sensitive to quenching modifications as the fragmentation function directly in z. We show that they are amenable to background subtraction using the same jet-area based techniques proposed in the past for jet p_t's. Furthermore, complications due to correlations between background-fluctuation contributions to the jet's p_t and to its particle content are easily corrected for.

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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