论文标题
搜索$γγ\ rightarrow e^+e^ - $ at RHIC中的深色光子
Search for Dark Photons in $γγ\rightarrow e^+e^-$ at RHIC
论文作者
论文摘要
暗物质的基本本质仍然是现代物理学的主要奥秘之一。一些模型假设存在巨大的仪表的存在，即“暗光子”（$ a^\ prime $），这可能会使暗物质颗粒与标准模型粒子相互作用。超偏见的重型离子碰撞会产生高度的洛伦兹收缩电磁场，具有足够的能量密度，可以潜在地表现为浅色暗光子。我们通过搜索$ e^+e^ - $ pairs在$γa^\ prime $和$ a^\ prime a^\ prime $ fusion中的$ e^+e^ - $对的异常生产中报告限制，从Ultra-form-pripheral $ \ rm {au}+\ rm {au {au {au} $ collisions中限制了限制。这项研究利用了Breit-wheeler工艺的测量值（$γγ\ rightArrow e^+e^ - $），由Star进行，专门利用了依赖于极化的最终方位方位不对称，以$ e^+e^ - $对。这些限制对于在超长沉重离子碰撞中的未来搜索方面具有丰富的信息，并限制了深色光子机制的未来理论发展。
The fundamental nature of Dark Matter remains one of the major mysteries of modern physics. Some models postulate the existence of a massive gauge boson, a "dark photon" ($A^\prime$), that may allow Dark Matter particles to interact with Standard Model particles. Ultra-relativistic heavy-ion collisions produce highly Lorentz-contracted electromagnetic fields with sufficient energy density to potentially manifest as light dark photons. We report limits on dark photon parameters via a search for anomalous production of $e^+e^-$ pairs in $γA^\prime$ and $A^\prime A^\prime$ fusion from ultra-peripheral $\rm{Au}+\rm{Au}$ collisions. This study utilizes measurements of the Breit-Wheeler process ($γγ\rightarrow e^+e^-$) carried out by STAR, specifically making use of polarization-dependent final-state azimuthal asymmetries in $e^+e^-$ pairs. These limits are informative for future searches in the ultra-peripheral heavy-ion collisions and to constrain future theoretical developments of the dark photon mechanism.
