近日，英国普利茅斯大学的B. King与中国海洋大学的唐琐合作并取得一项新进展。经过不懈努力，他们对强场中由对产生测量非解析QED耦合的可行性进行研究。相关研究成果已于2024年3月28日在国际知名学术期刊《物理评论A》上发表。

该研究团队利用局部单色方法，确定了可以在实验中测量隧道对产生的参数范围。他们研究了聚焦高斯脉冲碰撞的几种场景，包括非线性布雷特-惠勒的轫致辐射和逆康普顿源以及非线性三叉戟的高斯电子束，发现隧道参数区位置定义良好且具有鲁棒性。

据悉，在非线性布雷特-惠勒和三叉戟对产生的准静态区域中，速率展现出对量子电动力学基本耦合的非解析依赖，这与Schwinger真空对产生的形式颇为相似。然而，要实现这种隧穿状态，必须满足一系列相互竞争的条件：既需要高强度的强场参数，又需保持低量子特性，同时确保有足够多的对产生以供观察。

附：英文原文

Title: Feasibility of measuring nonanalytic QED coupling from pair creation in strong fields

Author: B. King, S. Tang

Issue&Volume: 2024/03/28

Abstract: In the quasistatic regimes of nonlinear Breit-Wheeler and trident pair creation, the rates can exhibit a nonanalytic dependency on the fundamental coupling of quantum electrodynamics, in a form similar to Schwinger vacuum pair creation. To reach this tunneling regime requires satisfying competing requirements: a high-intensity but low quantum strong-field parameter with sufficient pair creation to be observed. Using a locally monochromatic approach, we identify the parameter regime where tunneling pair creation could be measured in experiment. Studying several scenarios of collisions with focused Gaussian pulses, including a bremsstrahlung and an inverse Compton source for nonlinear Breit-Wheeler and a Gaussian electron beam for nonlinear trident, we find the position of the tunneling parameter regime to be well defined and robust.

DOI: 10.1103/PhysRevA.109.032823

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.109.032823