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Production of J/ψ+ηc versus J/ψ+J/ψ at the LHC: Importance of Real α5s Corrections

Abstract : We proceed for the first time to the evaluation of the Born cross section for J/ψ+ηc production, namely, via g+g→J/ψ+ηc+g, and show that it has a harder PT spectrum than the J/ψ-pair yield at the Born level. If one stuck to a comparison at the Born level, one would conclude that J/ψ+ηc production would surpass that of J/ψ+J/ψ at large PT. This is nonetheless not the case since J/ψ-pair production, as for single J/ψ, receives leading-PT contributions at higher orders in αs. We also present the first evaluation of these leading-PT next-to-leading order contributions. These are indeed significant for increasing PT and are of essential relevance for comparison with forthcoming data. We also compute kinematic correlations relevant for double-parton-scattering studies. Finally, we evaluate the polarization of a J/ψ accompanied by either an ηc or a J/ψ and another light parton. These results may be of great help to understand the polarization of quarkonia produced at high energies.
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http://hal.in2p3.fr/in2p3-00934268
Contributor : Sophie Heurteau <>
Submitted on : Tuesday, January 21, 2014 - 5:09:41 PM
Last modification on : Wednesday, October 14, 2020 - 3:59:47 AM

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J.-P. Lansberg, H. S. Shao. Production of J/ψ+ηc versus J/ψ+J/ψ at the LHC: Importance of Real α5s Corrections. Physical Review Letters, American Physical Society, 2013, 111, pp.122001. ⟨10.1103/PhysRevLett.111.122001⟩. ⟨in2p3-00934268⟩

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