Light by Light Scattering as a New Probe for Axions
Light by Light Scattering as a New Probe for Axions
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光散射作为轴子的新探针
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
S. Xue
中科院分区：
文献类型：
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作者：
S. Shakeri;D. Marsh;S. Xue
我们研究了高功率激光脉冲相互作用期间虚拟轴子对腔内光子偏振的影响。研究了一种用于测量逐光（LBL）散射过程中轴子引起的椭圆度信号的新颖检测方案。我们表明，探测激光束和高强度目标光束中的光子之间的动量交换可能会导致轴子物理质量处的共振。因此，真空双折射的共振增强产生大的椭圆度信号。可以应用这种信号增强来区分轴子对 LBL 散射的贡献和由于电子-正电子对而产生的标准模型贡献。针对实验上可行的探测光源和超高强度激光背景，研究了该方案的灵敏度。结果表明，该技术有可能探测质量范围 $10^{-2} \textrm{eV} \lesssim m_{a} \lesssim 1 \textrm{eV}$ 内的 QCD 轴子。在该区域中，轴子感应信号超过标准模型背景。
We study the impact of virtual axions on the polarization of photons inside a cavity during the interaction of high-power laser pulses. A novel detection scheme for measuring the axion-induced ellipticity signal during the Light-by-Light (LBL) scattering process is investigated. We show that a momentum exchange between photons in a probe laser beam and a high-intensity target beam may lead to a resonance at the physical mass of the axion. Consequently, the resonant enhancement of vacuum birefringence gives rise to a large ellipticity signal. This signal enhancement can be applied in order to discriminate between the axion contribution to LBL scattering and the standard model contribution due to electron-positron pairs. The sensitivity of the scheme is studied for experimentally feasible probe light sources and ultrahigh intensity laser backgrounds. It is shown that this technique has the potential to probe the QCD axion in the mass range $10^{-2} \textrm{eV} \lesssim m_{a} \lesssim 1 \textrm{eV}$. In this region the axion induced signal surpasses the standard model background.