Abstract
We update the study of the production of direct J/ψ in association with a Z boson at the Next-to-Leading Order (NLO) in α s by evaluating both the yield differential in P T and the J/ψ polarisation in the QCD-based Colour-Singlet Model (CSM). Contrary to an earlier claim, QCD corrections at small and mid P T are small if one assumes that the factorisation and the renormalisation scales are commensurate with the Z boson mass. As it can be anticipated, the t-channel gluon-exchange (t−CGE) topologies start to be dominant only for P T ≳ m Z /2. The polarisation pattern is not altered by the QCD corrections. This is thus far the first quarkonium-production process where this is observed in the CSM. Along the same lines, our predictions for direct \( Y+Z \) are also given.
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Gong, B., Lansberg, JP., Lorcé, C. et al. Next-to-leading-order QCD corrections to the yields and polarisations of J/ψ and \( Y \) directly produced in association with a Z boson at the LHC. J. High Energ. Phys. 2013, 115 (2013). https://doi.org/10.1007/JHEP03(2013)115
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DOI: https://doi.org/10.1007/JHEP03(2013)115