Abstract
We give predictions of J/ψ and ψ(2S) yields and polarizations in prompt production at hadron colliders based on non-relativistic QCD factorization formula. We calculate short-distance coefficients of all important color-octet intermediate channels as well as color-singlet channels up to \( \mathcal{O}\left({\alpha}_S^4\right) \), i.e. next-to-leading order in α S . For prompt J/ψ production, we also take into account feeddown contributions from χ cJ (J=0,1,2) and ψ(2S) decays. Color-singlet long-distance matrix elements (LDMEs) are estimated by using potential model, and color-octet LDMEs are extracted by fitting the Tevatron yield data only. The predictions are satisfactory for both yields and polarizations of prompt J/ψ and prompt ψ(2S) production at the Tevatron and the LHC. In particular, we find our predictions for polarizations of prompt J/ψ production have only a little difference from our previous predictions for polarizations of direct J/ψ production.
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Shao, HS., Han, H., Ma, YQ. et al. Yields and polarizations of prompt J/ψ and ψ(2S) production in hadronic collisions. J. High Energ. Phys. 2015, 103 (2015). https://doi.org/10.1007/JHEP05(2015)103
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DOI: https://doi.org/10.1007/JHEP05(2015)103