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arXiv 1607.00786hep-ex
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pPb与CMS碰撞中唯一的光致翻转

Exclusive Photoproduction of Upsilon in pPb collisions with the CMS

Ruchi Chudasama, Dipanwita Dutta

摘要:

利用CMS实验研究了质子和离子超周边碰撞(UPC)过程中光生Uppermons态的唯一性,为研究中心快度下部分子分数动量$x \approx 10^{-2} 10^{4}$(|y| $< 2.5$)的胶子分布提供了一个清晰的探针.在$\sqrt{s_{NN}}=5.02$ ~TeV能量下,测量了二μ子衰变通道中的三个Uppermant态(1 S,2S,3S),以及光子-光子衰变到二μ子QED连续谱,积分亮度为$L_{int} = 35$ nb $^{-1}$ .给出了不同光子-质子质心能量分布$W_{γp}$和t-微分分布下的Uppermant光生总截面,并与其它实验结果和理论预测进行了比较。

英文摘要:

Results of exclusive photoproduction of Upsilon states in Ultraperipheral collisions (UPC) of protons and ions with the CMS experiment are presented, which provides a clean probe of the gluon distribution at small values of parton fractional momenta $x \approx 10^{-2} 10^{4}$ at central rapidities (|y| $< 2.5$). The three Upsilon states (1S, 2S, 3S) are measured in the dimuon decay channel along with the photon-photon decaying to dimuon QED continuum at $\sqrt{s_{NN}}=5.02$~TeV for integrated luminosity of $L_{int} = 35$ nb$^{-1}$. The total Upsilon photoproduction cross sections at different photon-proton center of mass energy $W_{γp}$ and t-differential distributions are presented and compared with other experimental results as well as theoretical predictions.

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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