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arXiv 1707.04068hep-ph
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部分子Regge化方法中LHC处的$B{\bar B}$角关联与高阶矩阵元合并

$B{\bar B}$ angular correlations at the LHC in parton Reggeization approach merged with higher-order matrix elements

Anton Karpishkov, Maxim Nefedov, Vladimir Saleev

摘要:

在部分子Regge化方法的首级近似下,结合由附加硬胶子发射产生的次首级修正,计算了质子-质子碰撞中美($B$)和反美($\bar B$)介子的角分布谱.为了描述b夸克强子化,我们使用从世界$e^+e^-$湮灭数据中提取的普遍的标度相关的部分子到介子碎裂函数。在能量为$\sqrt{S}=7$ TeV的情况下,我们的预测与CMS协作组的数据在不确定性和无自由参数的情况下对$B \bar B$角关联进行了很好的吻合。在$\sqrt{S}=13$ TeV的类似相关观测的预测。

英文摘要:

We calculate the angular distribution spectra between beauty ($B$) and anti-beauty ($\bar B$) mesons in proton-proton collisions in the leading order approximation of the parton Reggeization approach consistently merged with the next-to-leading order corrections from the emission of additional hard gluon. To describe b-quark hadronization we use the universal scale-depended parton-to-meson fragmentation functions extracted from the world $e^+e^-$ annihilation data. We have obtained good agreement between our predictions and data from the CMS Collaboration at the energy $\sqrt{S}=7$ TeV for $B \bar B$ angular correlations within uncertainties and without free parameters. Predictions for analogous correlation observables at $\sqrt{S}=13$ TeV are provided.

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