Yan-Qing Ma

activity

20232026

most citedA high-precision result for a full-color three-loop three-point form factor in

N = 4

SYM

5 citations · 9 across the 9 of their papers we have counts for

collaborators

Showing 2025Show all

2 papers · 1 filter

hep-ph2025

Two-loop QCD-corrections to $e^{+} e^{-} \to Z^{*} \to J / ψ + J / ψ$

Xiang Chen, Xin Guan, Chuan-Qi He +1

We present a next-to-next-to-leading-order calculation within the nonrelativistic QCD framework for the process of $e^{+} e^{-} \to Z^{*} \to J / ψ + J / ψ$ . We find t…

hep-ph2025

Analytical two-loop amplitudes of $e^{+} e^{-} ⟶ J / ψ + η_{c}$ at $B$ factories

Xiang Chen, Xin Guan, Chuan-Qi He +3

In double charmonium production, a long-standing challenge is that the theoretical predictions are not consistent with the measurements at B factories. Within the NRQCD framework,…

Two-loop QCD-corrections to e+e−→Z∗→J/ψ+J/ψ

Analytical two-loop amplitudes of e+e−⟶J/ψ+ηc​ at B factories

Two-loop QCD-corrections to $e^{+} e^{-} \to Z^{*} \to J / ψ + J / ψ$

Analytical two-loop amplitudes of $e^{+} e^{-} ⟶ J / ψ + η_{c}$ at $B$ factories