Next-to-leading-order QCD correction to the exclusive double charmonium production via Z decays

2022/09/19 by Xuan Luo, Hai-Bing Fu, Luo, Xuan +5
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.2209.08802

openalex publication_date 2022/09/19 · openalex created_date 2022/09/21 · openalex updated_date 2026/07/28

Abstract

In this paper, we preformed a further research on the exclusive productions of double charmonium via Z-boson decay by using nonrelativistic QCD factorizations approach, where the single-photon fragmentation topologies of the QED diagrams, the interference terms between the QCD and full QED diagrams, the next-to-leading-order calculations of the interference terms are preformed. For the production of J/ψ+J/ψ in Z-boson decay, the interference terms show a significantly phenomenological effect due to the addition of the newly calculated NLO QCD corrections. After adding together all contributions, the branching fraction B_{Z→ J/ψJ/ψ} still undershoots the CMS collaboration data obviously. In addition, we simultaneously complete the next-to-leading-order calculations for Z→ J/ψ+η_c (χ_cJ) with J=(0,1,2). The calculated results show that the newly-calculated complete QED and cross terms will have obvious effective on the total decay widths.

Related

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