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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

Abstract : We update the study of the production of direct J/Psi in association with a Z boson at the Next-to-Leading Order (NLO) in alpha_s by evaluating both the yield differential in P_T and the J/Psi 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 > mZ/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 Upsilon+Z are also given.
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http://hal.in2p3.fr/in2p3-00740431
Contributor : Sophie Heurteau <>
Submitted on : Wednesday, October 10, 2012 - 11:08:34 AM
Last modification on : Wednesday, September 16, 2020 - 4:08:15 PM

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Bin Gong, Jean-Philippe Lansberg, Cédric Lorcé, Jian-Xiong Wang. 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. Journal of High Energy Physics, Springer Verlag (Germany), 2013, 2013 (3), pp.115. ⟨10.1007/JHEP03(2013)115⟩. ⟨in2p3-00740431⟩

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