Forward J/ψ+J/ψ and J/ψ+ψ’ production with high-energy factorization

Авторы: Baranov S.P., Lipatov A.V., Malyshev M.A., Prokhorov A.A., Zhang P.M.
Журнал: Physical Review D
Том: 110
Номер: 5
Год издания: 2024
Издательство: American Physical Society
Местоположение издательства: United States
Первая страница: 054001
DOI: 10.1103/PhysRevD.110.054001
Аннотация: We calculate the cross sections of associated 𝐽/𝜓+𝜓′ and 𝐽/𝜓+𝐽/𝜓 production in 𝑝⁢𝑝 collisions at √𝑠=13 TeV in the forward kinematic region. The high-energy factorization (𝑘𝑇-factorization) framework supplemented with the Catani-Ciafaloni-Fiorani-Marchesini evolution of gluon densities in a proton is applied. We demonstrate that the latest data on 𝐽/𝜓+𝐽/𝜓 production and first experimental data on 𝐽/𝜓+𝜓′ events taken very recently by the LHCb Collaboration can be described well by the color singlet terms and contributions from double parton scattering (DPS) with the standard choice for 𝜎eff parameter. The relative production rate 𝜎⁢(𝐽/𝜓+𝜓′)/𝜎⁢(𝐽/𝜓+𝐽/𝜓) is found to be sensitive to the DPS terms as well as to feeddown contributions.
Добавил в систему: Малышев Максим Алексеевич

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