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arXiv 2201.05832hep-ph
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$J/ψ$与次领先级QCD中希格斯玻色子衰变的底夸克对的关联产生

$J/ψ$ associated production with a bottom quark pair from the Higgs boson decay in next-to-leading order QCD

Xue-An Pan, Zhong-Ming Niu, Mao Song, Yu Zhang, Gang Li, Jian-You Guo

摘要:

本文在非相对论QCD框架下研究了希格斯玻色子衰变产生的底夸克对$J/ψ$关联产生的次领先阶QCD修正。计算结果表明,过程$H \rightarrow b+ J/ψ+\bar{b}$在首级(LO)的衰减宽度主要来自Fock态$^3S^{(8)}_1$的贡献,而非线性光学QCD修正使过程在LO级的衰减宽度增加了约2倍.在NLO精度下,Fock态$^3S^{(8)}_1$和$^3P^{(8)}_J$通道的贡献最大,分别约占希格斯玻色子衰变产生的底夸克对的$J/ψ$衰变宽度的$68\%$和$29\%$.考虑到彩色八重态(CO)通道在NLO精度下的主要贡献,包含性衰变过程$H\to b+J/ψ+\bar b + X$有可能在未来的高能/高亮度对撞机中被发现。对希格斯玻色子玻色子衰变产生底夸克对的$J/ψ$的研究,不仅有助于研究色八重态的产生机制,而且有助于研究希格斯玻色子玻色子与底夸克的耦合.

英文摘要:

In this work, we investigate the next-to-leading order (NLO) QCD correction to $J/ψ$ associated production with a bottom quark pair from the Higgs boson decay within the nonrelativistic QCD framework. From numerical results, {we find that the decay width of process $H \rightarrow b+ J/ψ+\bar{b}$ at leading order (LO) mainly comes from the contribution of the Fock state $^3S^{(8)}_1$, and the NLO QCD corrections significantly enhance the decay width at LO accuracy by about 2 times. At NLO accuracy, the Fock states $^3S^{(8)}_1$ and $^3P^{(8)}_J$ channels give the main contribution, accounting for about $68\%$ and $29\%$ of the total decay width of $J/ψ$ associated production with a bottom quark pair at NLO accuracy from the Higgs boson decay, respectively. Considering the dominant contribution of color octet (CO) channels at NLO accuracy, the inclusive decay process $H\to b+J/ψ+\bar b + X$ has the potential to be found in future colliders with high energy/luminosity.} The study of $J/ψ$ associated production with a bottom quark pair from the Higgs boson decay is not only useful to study the mechanism of color-octet, but also to assist in the investigation of the coupling for the Higgs boson with the bottom quark.

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