Scalar-pseudoscalar pair production at the Large Hadron Collider at NLO+NLL accuracy in QCD

Scalar-pseudoscalar pair production at the Large Hadron Collider at NLO+NLL accuracy in QCD
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大型强子对撞机在 QCD 中 NLO NLL 精度下的标量-伪标量对产生

DOI:
10.1088/1674-1137/ac23d2
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发表时间:
2021-09
期刊:
影响因子:
3.6
通讯作者:
Li Shu-Xiang
Li Shu-Xiang
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Li He-Yi;Zhang Ren-You;Zhang Yu;Ma Wen-Gan;Long Ming-Ming;Li Shu-Xiang

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我们详细研究了在QCD NLO+NLL精度下,通过夸克-反夸克湮灭,在QCD NLO+NLL精度下,通过夸克-反夸克湮没产生标量-伪标量对的横向动量和阈值恢复效应。引入因式分解方法,对Collins-Sper-Sterman恢复方法得到的恢复结果适当补充了部分子分布函数对软胶子(阈值)恢复的贡献。我们发现,阈值恢复改进的PDF的影响与分式矩阵元的恢复效果相当,甚至可以在高不变质量区域占据主导地位。此外,我们的计算还考虑了I型双希格斯模型中的环诱导胶子-胶子融合通道。我们的数值结果表明,通过夸克-反夸克湮灭产生的电弱比胶子引发的QCD产生要强得多。
We investigate in detail both transverse momentum and threshold resummation effects on the scalar-pseudoscalar pair production via quark-antiquark annihilation at the \begin{document}$ 13 \; \text{TeV}$\end{document} Large Hadron Collider at the QCD NLO+NLL accuracy. A factorization method is introduced to supplement properly the soft-gluon (threshold) resummation contribution from parton distribution functions to the resummed results obtained by the Collins-Soper-Sterman resummation approach. We find that the impact of the threshold-resummation improved PDFs is comparable to the resummation effect from the partonic matrix element and can even predominate in high invariant mass region. Moreover, the loop-induced gluon-gluon fusion channel in the type-I two-Higgs-doublet model is also taken into account in our calculation. Our numerical results show that the electroweak production via quark-antiquark annihilation dominates over the gluon-initiated QCD production by \begin{document}$ 1 \sim 2$\end{document} orders of magnitude.
NLO+nll squark和Gluino生产截面具有阈值改良的Parton分布。
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