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arXiv 2409.01424hep-ph
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POWHEG中双喷注伴随的瞬发光子产生

Prompt photon production with two jets in POWHEG

Tomáš Ježo, Michael Klasen, Alexander Neuwirth

AI总结:

本文在POWHEG框架下计算次领头阶瞬发光子伴随双喷注产生,并匹配PYTHIA与HERWIG部分子簇射,验证其与ATLAS数据及次次领头阶计算的一致性。

摘要:

瞬发光子产生对自由质子和原子核中夸克与胶子的分布高度敏感,并且是夸克-胶子等离子体性质唯象研究的重要基线。本文给出了量子色动力学次领头阶下瞬发光子伴随双喷注产生的新计算,并利用POWHEG方法与部分子簇射进行匹配。该计算扩展了我们此前使用POWHEG+PYTHIA对瞬发光子伴随单喷注产生的分析。我们研究了部分子簇射作为部分子到光子碎裂过程替代描述的作用,并分析了光子与喷注之间的关联。此外,我们将POWHEG+PYTHIA与POWHEG+HERWIG预言、ATLAS实验的孤立光子数据以及次次领头阶微扰计算进行了比较。两种部分子簇射模型都使次领头阶预言与实验数据及次次领头阶计算达到良好一致。

英文摘要:

Prompt photon production is highly sensitive to the distribution of quarks and gluons in free protons and nuclei and an important baseline for phenomenological studies of the properties of the quark-gluon plasma. In this paper, we present a new calculation of the production of prompt photons in association with two jets at next-to-leading order in quantum chromodynamics matched to parton showers with the POWHEG method. This calculation extends our previous analysis of prompt photon production in association with one jet using \texttt{POWHEG+PYTHIA}. We investigate the role of the parton shower as an alternative description of the parton-to-photon fragmentation process and analyse correlations between the photon and the jets. In addition, we compare \texttt{POWHEG+PYTHIA} with \texttt{POWHEG+HERWIG} predictions, experimental ATLAS data for isolated photons, and a perturbative calculation at next-to-next-to-leading order. Both parton shower models bring the next-to-leading order prediction into good agreement with the experimental data and the next-to-next-to-leading order calculation.

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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