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The studies on $Z o Upsilon(1S)+g+g$ at the next-to-leading-order QCD accuracy | | Zhan Sun
; | | Date: |
9 Feb 2020 | | Abstract: | In this paper, we carry out the next-to-leading-order (NLO) studies on $Z o
Upsilon(1S)+g+g$ via the color-singlet $bar{b}$ state. We find the newly
calculated NLO QCD corrections to this process can significantly influence its
leading-order (LO) results, and greatly improve the dependence on the
renormalization scale. By including the considerable feeddown contributions,
the branching ratio $mathcal{B}_{Z o Upsilon(1S)+g+g}$ is predicted to be
$(0.56 sim 0.95) imes 10^{-6}$, which can reach up to $19\% sim 31\%$ of the
LO predictions given by the CS dominant process $Z o Upsilon(1S)+b+ar{b}$.
Moreover, $Z o Upsilon(1S)+g+g$ also seriously affect the CS predictions on
the $Upsilon(1S)$ energy distributions, especially when $z$ is relatively
small. In summary, for the inclusive $Upsilon(1S)$ productions in $Z$ decay,
besides $Z o Upsilon(1S)+b+ar{b}$, the gluon radiation process $Z o
Upsilon(1S)+g+g$ can provide indispensable contributions as well. | | Source: | arXiv, 2002.3290 | | Services: | Forum | Review | PDF | Favorites | |
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