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- W2078889723 abstract "Dominant spin-flip effects for the direct and prompt $J/ensuremath{psi}$ polarizations at Tevatron run II with collision energy 1.96 TeV and rapidity cut $|{y}^{J/ensuremath{psi}}|<0.6$ are systematically studied. The spin-flip effect for the transition of $(coverline{c}{)}_{8}[^{3}S_{1}]$ into $J/ensuremath{psi}$ is especially discussed with care. It is found that the spin-flip effect shall always dilute the $J/ensuremath{psi}$ polarization, and with a suitable choice of the parameters ${a}_{0,1}$ and ${c}_{0,1,2}$, the $J/ensuremath{psi}$ polarization puzzle can be solved to a certain degree. At large transverse momentum ${p}_{t}$, $ensuremath{alpha}$ for the prompt $J/ensuremath{psi}$ is reduced by $ensuremath{sim}50%$ for ${f}_{0}={v}^{2}$ and by $ensuremath{sim}80%$ for ${f}_{0}=1$. We also study the indirect $J/ensuremath{psi}$ polarization from the $b$ decays, which however is slightly affected by the same spin-flip effect and then shall provide a better platform to determine the color-octet matrix elements." @default.
- W2078889723 created "2016-06-24" @default.
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- W2078889723 date "2009-08-10" @default.
- W2078889723 modified "2023-09-23" @default.
- W2078889723 title "Dominant spin-flip effects for the hadronic-producedJ/ψpolarization at the Tevatron" @default.
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- W2078889723 doi "https://doi.org/10.1103/physrevd.80.034010" @default.
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