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arXiv 1809.08602hep-exnucl-ex
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$\sqrt{s_\mathrm{NN}} =$ 5.02 TeV时PbPb和pp碰撞中孤立光子标记喷流的喷流形状

Jet shapes of isolated photon-tagged jets in PbPb and pp collisions at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV

CMS Collaboration

摘要:

研究了与孤立光子有关的喷注在PbPb碰撞中相对于pp碰撞中喷注形状的变化。这些数据是在LHC的CMS探测器上收集的,核子-核子质心能量为5.02 TeV。喷流形状是由轨道横动量($p_\mathrm{T}$)大于1 GeV/c的带电粒子在喷流轴周围的环中构成的,其中$p^\mathrm{jet}_\mathrm{T}$ $>$为30 GeV/c,与$p^γ_\mathrm{T}$ $>$为60 GeV/c的孤立光子相关。外围PbPb和PP碰撞之间的射流形状分布是一致的,但修改为更多的中心PbPb碰撞。在这些中心PbPb事件中,与PP相比,在距射流轴较大的距离处观察到较大比例的射流动量,反映了在重离子碰撞中产生的部分子介质与穿越部分子之间的相互作用。

英文摘要:

The modification of jet shapes in PbPb collisions, relative to those in pp collisions, is studied for jets associated with an isolated photon. The data were collected with the CMS detector at the LHC at a nucleon-nucleon center-of-mass energy of 5.02 TeV. Jet shapes are constructed from charged particles with track transverse momenta ($p_\mathrm{T}$) above 1 GeV/c in annuli around the axes of jets with $p^\mathrm{jet}_\mathrm{T}$ $>$ 30 GeV/c associated with an isolated photon with $p^γ_\mathrm{T}$ $>$ 60 GeV/c. The jet shape distributions are consistent between peripheral PbPb and pp collisions, but are modified for more central PbPb collisions. In these central PbPb events, a larger fraction of the jet momentum is observed at larger distances from the jet axis compared to pp, reflecting the interaction between the partonic medium created in heavy ion collisions and the traversing partons.

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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