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arXiv 1107.4891nucl-ex
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STAR中p+p和d+Au碰撞的喷注重建和潜在事件研究

Jet reconstruction and underlying event studies in p+p and d+Au collisions from STAR

Jana Bielcikova

摘要:

描述高能重离子碰撞中产生的热而致密的核物质与部分子的相互作用是一项复杂的任务,需要对p+p和d+Au碰撞中喷流的产生有详细的了解。因此,在这些碰撞系统中的测量是必不可少的,从冷核物质效应,介质诱导的$k_T$加宽和喷流淬火解开初始状态的核效应。为了获得p+p(d+Au)碰撞的完整描述,研究底层事件中的粒子产生也很重要。所测量的事件的性质可以用来调谐QCD的Monte-Carlo模型。本文介绍了STAR实验测量的$\sqrt{s_{NN}}$ = 200 GeV的p+p和d+Au碰撞中喷注和底层事件性质的一些最新结果。特别地,讨论了p+p碰撞中带电粒子和奇异粒子碎裂函数的初步结果,并与PYTHIA模拟结果进行了比较。其次,我们给出了d+Au碰撞中包含喷注谱和双喷注关联的测量结果,并与p+p碰撞中的测量结果进行了比较,以估计冷核物质效应的大小。最后,在p+p碰撞的基础事件属性的研究显示,并比较PYTHIA模拟。

英文摘要:

Description of parton interaction with the hot and dense nuclear matter created in heavy-ion collisions at high energies is a complex task, which requires a detailed knowledge of jet production in p+p and d+Au collisions. Measurements in these collision systems are therefore essential to disentangle initial state nuclear effects from cold nuclear matter effects, medium-induced $k_T$ broadening and jet quenching. To obtain complete description of the p+p (d+Au) collision it is also important to study particle production in the underlying event. The measured properties of underlying event can be used to tune the QCD based Monte-Carlo models. In this paper some of the recent results on jet and underlying event properties in p+p and d+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV measured by the STAR experiment are presented. In particular, the preliminary results on charged and strange particle fragmentation functions in p+p collisions are discussed and confronted with PYTHIA simulations. Next, the measurement of inclusive jet spectrum and di-jet correlations in d+Au collisions is presented and compared with the measurements in p+p collisions to estimate the size of cold nuclear matter effects. Finally, the study of underlying event properties in p+p collisions is shown and compared to PYTHIA simulation.

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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