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arXiv 1609.04355hep-phnucl-exnucl-th
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矢量介子的光生:从超周边到半中心重离子碰撞

Photoproduction of vector mesons: from ultraperipheral to semi-central heavy ion collisions

M. Klusek-Gawenda, A. Szczurek

摘要:

本文讨论了末态中含有一个或两个矢量介子的$AA \to AAV$和$AA \to AAVV$反应的核截面。我们的分析是在碰撞参量空间等效光子近似下进行的。这种方法允许考虑上述过程,同时考虑碰撞核之间的距离。我们考虑超周边和半中心碰撞。我们是第一组进行了研究的单一$J/ψ$光生产的不同中心箱。我们表明,一个可以描述新的ALICE实验数据,包括几何碰撞的通量因子的影响。其次,给出了超相对论超周边重离子碰撞中$AA \to AAVV$反应的全散射截面和微分散射截面。在这方面,我们考虑双光生和光子-光子过程。同时,我们的结果与STAR(RHIC),CMS和ALICE(LHC)的单$ρ^0$和$J/ψ$矢量介子产生的实验数据符合得很好.我们的预测独家四个收费π介子生产的比较。

英文摘要:

We discuss nuclear cross sections for $AA \to AAV$ and $AA \to AAVV$ reactions with one or two vector mesons in the final state. Our analysis is done in the impact parameter space equivalent photon approximation. This approach allows to consider the above processes taking into account distance between colliding nuclei. We consider both ultraperipheral and semi-central collisions. We are a first group which undertook a study of single $J/ψ$ photoproduction for different centrality bins. We show that one can describe new ALICE experimental data by including geometrical effects of collisions in the flux factor. Next, total and differential cross section for double-scattering mechanism in the exclusive $AA \to AAVV$ reaction in ultrarelativistic ultraperipheral heavy ion collisions is presented. In this context we consider double photoproduction and photon-photon processes. Simultaneously, we get very good agreement of our results with STAR (RHIC), CMS and ALICE (LHC) experimental data for single $ρ^0$ and $J/ψ$ vector meson production. A comparison of our predictions for exclusive four charged pions production is also presented.

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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