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arXiv 1808.00740hep-phnucl-ex
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CERN大型强子对撞机上离子超周边碰撞中的核子解离和核上的非相干光生$J/ψ$

Nucleon dissociation and incoherent $J/ψ$ photoproduction on nuclei in ion ultraperipheral collisions at the CERN Large Hadron Collider

V. Guzey, M. Strikman, M. Zhalov

摘要:

利用高能强子-核散射截面涨落的一般概念,导出了重核$dσ_{γA \to J/ψY}/dt$上非相干$J/ψ$光生截面的表达式,它包括了靶核子上的弹性光生$dσ_{γp \to J/ψp}/dt$和质子解离光生$dσ_{γp \to J/ψY}/dt$.我们发现,具有良好的精度,$dσ_{γA \to J/ψY}/dt$可以表示为产品的总和的$dσ_{γp \to J/ψp}/dt$和$dσ_{γp \to J/ψY}/dt$截面,这已在HERA测量,和共同的核阴影因子,这是使用领先的扭曲核阴影模型计算。我们的预测在$\sqrt{s_{NN}}=2.76$ TeV和$y=0$,$dσ_{AA \to J/ψAY}(y=0)/dy=0.59-1.24$ MB的Pb-Pb UPC的非相干$J/ψ$光生的横截面,同意在重大的理论不确定性与ALICE合作的数据。

英文摘要:

Using the general notion of cross section fluctuations in hadron--nucleus scattering at high energies, we derive an expression for the cross section of incoherent $J/ψ$ photoproduction on heavy nuclei $dσ_{γA \to J/ψY}/dt$, which includes both elastic $dσ_{γp \to J/ψp}/dt$ and proton-dissociation $dσ_{γp \to J/ψY}/dt$ photoproduction on target nucleons. We find that with good accuracy, $dσ_{γA \to J/ψY}/dt$ can be expressed as a product of the sum of the $dσ_{γp \to J/ψp}/dt$ and $dσ_{γp \to J/ψY}/dt$ cross sections, which have been measured at HERA, and the common nuclear shadowing factor, which is calculated using the leading twist nuclear shadowing model. Our prediction for the cross section of incoherent $J/ψ$ photoproduction in Pb-Pb UPCs at $\sqrt{s_{NN}}=2.76$ TeV and $y=0$, $dσ_{AA \to J/ψAY}(y=0)/dy=0.59-1.24$ mb, agrees within significant theoretical uncertainties with the data of the ALICE collaboration.

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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