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• W2239232533 abstract "In this paper, we study the $J/psi(Upsilon)$ production in Z boson decay in color-singlet model(CSM). We calculate the next-to-leading-order (NLO) QCD correction to $Z to Quarkonium+Qbar{Q}$, the dominant contribution in the CSM, with the vector and axial-vector parts in $ZQbar{Q}$ vertex being treated separately. The results show that the vector and axial-vector parts have the same K factor (the ratio of NLO result to leading-order result) 1.13 with the renormalization scale $mu$=2$m_c$ and $m_c=1.5GeV$, and the K factor falls to 0.918 when applying the Brodsky, Lepage, and Mackenzie(BLM) renormalization scale scheme with obtained $mu_{BLM}=2.28GeV$ and $m_c=1.5$GeV. By including the contributions from the next-dominant ones, the photon and gluon fragmentation processes, the branching ratio for $Z to J/psi_{prompt}+X$ is $(7.3 sim 10.0)times 10^{-5}$ with the uncertainty consideration for the renormalization scale and Charm quark mass. The results are about half of the central value of the experimental measurement 2.1$times10^{-4}$. Furthermore, the $J/psi$ energy distribution in our calculation is not well consistent with the experimental data. Therefore, even at QCD NLO, the contribution to $Z to J/psi_{prompt}+X$ from the CSM can not fully account for the experimental measurement. And there should be contributions from other mechanisms, such as the color-octet(COM) contributions. We define $R_{cbar{c}}=frac{Gamma(Z to J/psi cbar{c}X)}{Gamma(Z to J/psi X)}$ and obtain $R_{cc}=0.84$ for only CSM contribution and $R_{cc}=0.49$ for COM and CSM contributions together. Then $R_{cc}$ measurement could be used to clarify the COM contributions." @default.
• W2239232533 created "2016-06-24" @default.
• W2239232533 creator A5002790443 @default.
• W2239232533 creator A5015464256 @default.
• W2239232533 date "2010-09-07" @default.
• W2239232533 modified "2023-10-14" @default.
• W2239232533 title "Next-to-leading-order QCD correction to inclusive<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>J</mml:mi><mml:mo>/</mml:mo><mml:mi>ψ</mml:mi><mml:mo stretchy=false>(</mml:mo><mml:mi>Υ</mml:mi><mml:mo stretchy=false>)</mml:mo></mml:math>production in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:msup><mml:mi>Z</mml:mi><mml:mn>0</mml:mn></mml:msup></mml:math>decay" @default.
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• W2239232533 doi "https://doi.org/10.1103/physrevd.82.054006" @default.
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