论文标题
$ p $ - $ p $和$ pb $ - $ pb $ collisisions in LHC Energies的非弹性重夸克光生生产
Inelastic heavy quarkonium photoproduction in $p$-$p$ and $Pb$-$Pb$ collisions at LHC energies
论文作者
论文摘要
我们研究了非弹性charmon（$ j/ψ$，$ψ（2s）$）和底部（$υ（ns）$）的光增生和碎片化过程，$ p $ - $ p $ - $ p $和$ pb $ - $ pb $ - $ pb $ collisisions in LHC Energies，其中包括超含量的光子发射。在NRQCD分解方法的框架中，开发了一种精确的处理，该处理恢复了该区域附近的Weizsäcker-Williams近似（WWA）$ q^{2} \ sim0 $，其中使用Martin-Ryskin和BCCKL的方法来避免双重计数。我们计算$ q^{2} $，$ y $，$ z $，$ \ sqrt {s} $，$ p_ {t} $依赖性和总交叉部分。事实证明，非弹性光生产和碎片化过程为重型Quarkonium生产提供了宝贵的贡献，尤其是在大型$ p_ {t} $区域中。虽然超牢房光子通道的相对贡献非常重要，它随着Quarkonium质量的增长而迅速增加，并开始在大$ p_ {t} $范围内主导光生增生过程。此外，我们在重型离子碰撞中获得了WWA的完整有效范围。 WWA在高能量和$ PB $ -PB $碰撞方面具有更高的精度。现有的光子光谱通常得出超出了WWA的适用范围，并且在同时考虑不同的通道时存在双重计数。
We study the inelastic charmonium ($J/ψ$, $ψ(2S)$) and bottomonium ($Υ(nS)$) photoproduction and fragmentation processes in $p$-$p$ and $Pb$-$Pb$ collisions at LHC energies, where the ultra-incoherent photon emission is included. In the framework of the NRQCD factorization approach, an exact treatment is developed which recovers Weizsäcker-Williams approximation (WWA) near the region $Q^{2}\sim0$, where the methods of Martin-Ryskin and BCCKL are used to avoid double counting. We calculate the $Q^{2}$, $y$, $z$, $\sqrt{s}$, $p_{T}$ dependent and the total cross sections. It turns out that the inelastic photoproduction and fragmentation processes provide valuable contributions to the heavy quarkonium production, especially in the large $p_{T}$ regions. While the relative contribution of ultra-incoherent photon channel is very important, which rapidly increases along with the growing quarkonium mass, and begins to dominate the photoproduction processes at large $p_{T}$ ranges. Moreover, we obtain the complete validity scopes of WWA in inelastic heavy quarkonium photoproduction in heavy-ion collisions. WWA has a much higher accuracy at high energies and in $Pb$-$Pb$ collisions. The existing photon spectra are generally derived beyond the applicable scopes of WWA, and the double counting exists when the different channels are considered simultaneously.
