Sensitivity improvement in hidden photon detection using resonant cavities

Precision optomechanics for geometrically modematched Fabry-Perot cavities in ALPS II

Challenging optical resonant gain achieved via the use of two geometrically modematched Fabry-Perot cavities is anticipated in Any Light Particle Search II (ALPS II) to extend the search sensitivity of light-weight sub-eV dark matter candidates to uncharted parameter space of scientific interest. We report on the precision optomechanics developed for geometrical modematching of optical cavities. The general concept, the mechanical mounting scheme, and the use of an autocollimator to streamline the metrology procedure are rigorously examined using optical interferometry, all of which meet the r…

Microwave cavity light shining through a wall optimization and experiment

It has been proposed that microwave cavities can be used in a photon regeneration experiment to search for hidden sector photons. Using two isolated cavities, the presence of hidden sector photons could be inferred from a 'light shining through a wall' phenomenon. The sensitivity of the experiment has strong a dependence on the geometric construction and electromagnetic mode properties of the two cavities. In this paper we perform an in depth investigation to determine the optimal setup for such an experiment. We also describe the results of our first microwave cavity experiment to search for …

利用谐振腔探测致密双星并合产生的超高频引力波的前景

Prospects for detection of ultra high frequency gravitational waves from compact binary coalescenses with resonant cavities

本文以GrAHal为基准，系统分析了1-10 GHz频段haloscope实验探测致密双星并合超高频引力波的前景，修订了相关公式并评估了可探测距离与事件率，认为近期探测极不可能。

Feasibility, engineering aspects and physics reach of microwave cavity experiments searching for hidden photons and axions

Using microwave cavities one can build a resonant ``light-shining-through-walls'' experiment to search for hidden sector photons and axion like particles, predicted in many extensions of the standard model. In this note we make a feasibility study of the sensitivities which can be reached using state of the art technology.

Identify the hidden charm pentaquark signal from non-resonant background in electron-proton scattering

We study the electroproduction of the LHCb pentaquark states with the assumption that they are resonant states. The main concern here is to investigate the final state distribution in the phase space in order to extract the feeble pentaquark signal from the large non-resonant background. Our results show that the ratio of the signal to background would increase significantly with proper kinematic cut, which would be very helpful for future experimental analysis.

A Cavity Experiment to Search for Hidden Sector Photons

We propose a cavity experiment to search for low mass extra U(1) gauge bosons with gauge-kinetic mixing with the ordinary photon, so-called paraphotons. The setup consists of two microwave cavities shielded from each other. In one cavity, paraphotons are produced via photon-paraphoton oscillations. The second, resonant, cavity is then driven by the paraphotons that permeate the shielding and reconvert into photons. This setup resembles the classic ``light shining through a wall'' setup. However, the high quality factors achievable for microwave cavities and the good sensitivity of microwave de…

轴子暗物质衰变的共振增强

Resonant enhancement of axion dark matter decay

研究轴子衰变为两光子的过程，利用共振腔增强衰变率，提供一种新的探测轴子参数空间的方法，与现有方法互补，适用于QCD轴子暗物质研究。

Light Shining Through a Thin Wall: Evanescent Hidden Photon Detection

A kinetically-mixed hidden photon is sourced as an evanescent mode by electromagnetic fields that oscillate at a frequency smaller than the hidden photon mass. These evanescent modes fall off exponentially with distance, but nevertheless yield detectable signals in a photon regeneration experiment if the electromagnetic barrier is made sufficiently thin. We consider such an experiment using superconducting cavities at GHz frequencies, proposing various cavity and mode arrangements that enable unique sensitivity to hidden photon masses ranging from $10^{-5}$ eV to $ 10^{-1}$ eV.