量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人 量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum Science and Technology.
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The Gamma Factory is a proposal to backscatter laser photons off a beam of partially-stripped ions at the LHC, producing a beam of $\sim 10~\mev$ to $1~\gev$ photons with intensities of $10^{16}$ to $10^{18}~\text{s}^{-1}$. This implies $\sim 10^{23}$ to $10^{25}$ photons on target per year, many orders of magnitude greater than existing light sources and also far greater than all current and planned electron and proton fixed target experiments. We determine the Gamma Factory's discovery potential through ``dark Compton scattering,'' $\gamma e \to e X$, where $X$ is a new, weakly-interacting particle. For dark photons and other new gauge bosons with masses in the 1~to~100 MeV range, we show that the Gamma Factory has the potential to discover new particles with couplings $\varepsilon \sim 10^{-9}$ to $10^{-5}$. This range includes couplings far below those probed by other terrestrial experiments, which were previously thought to be accessible only to astrophysical probes. We outline the requirements of an experiment to realize this potential and determine the sensitivity reach for various experimental configurations.
Gamma factory searches for extremely weakly interacting particles
