标题： 揭示魅夸克偶素 显示英文标题

标题： Shedding light on charmonium

摘要： 我们在一个基于轻子面QCD的相对论方法中研究了J/ψ介子中的E1辐射跃迁。 在量子场论中，有两个过程是纯E1：$\chi_{c0} \to J/\psi \gamma$($\psi\to \chi_{c0}\gamma$)和$h_c \to \eta_c\gamma$($\eta_c' \to h_c\gamma$)，都涉及$P$波的J/ψ介子。 我们计算了各种过程的E1辐射衰变宽度以及相应的跃迁形式因子，包括涉及$2P$态的过程。 这些可观测量提供了对$P$波J/ψ介子微观结构的了解。 我们表明，当有实验测量和格点模拟时，我们的无参数预测与实验测量和格点模拟结果高度一致。 显示英文摘要

摘要： We investigate E1 radiative transitions within charmonium in a relativistic approach based on light-front QCD. In quantum field theory, two sets of processes are pure E1: $\chi_{c0} \to J/\psi \gamma$ ($\psi\to \chi_{c0}\gamma$) and $h_c \to \eta_c\gamma$ ($\eta_c' \to h_c\gamma$), both involving the $P$-wave charmonia. We compute the E1 radiative decay widths as well as the corresponding transition form factors of various processes including those involving $2P$ states. These observables provide an access to the microscopic structures of the $P$-wave charmonium. We show that our parameter-free predictions are in excellent agreement with the experimental measurements as well as lattice simulations whenever available.