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J/ψ production at \sqrt{s}=1.96 and 7 TeV: colour-singlet model, NNLOsstarf and polarization

Abstract : We study J/ψ production in pp collisions at \sqrt{s}=1.96 and 7 TeV using the colour-singlet model (CSM), including next-to-leading order (NLO) corrections and dominant α5S contributions (NNLOsstarf). We find that the CSM reproduces the existing data if the upper range of the NNLOsstarf is near the actual--but presently unknown--NNLO. The direct yield polarization for the NLO and NNLOsstarf is increasingly longitudinal in the helicity frame when PT gets larger. When one combines the direct yield with a data-driven range for the polarization of J/ψ from χc, the prompt J/ψ polarization yield polarization in the CSM gets significantly closer to the experimental data from the CDF collaboration.
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http://hal.in2p3.fr/in2p3-00713250
Contributor : Sophie Heurteau <>
Submitted on : Friday, June 29, 2012 - 4:40:27 PM
Last modification on : Wednesday, September 16, 2020 - 4:07:53 PM

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J.P. Lansberg. J/ψ production at \sqrt{s}=1.96 and 7 TeV: colour-singlet model, NNLOsstarf and polarization. Journal of Physics G: Nuclear and Particle Physics, IOP Publishing, 2011, 38, pp.124110. ⟨10.1088/0954-3899/38/12/124110⟩. ⟨in2p3-00713250⟩

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