We propose a simple model in which dark matter particle exchanges mediate new quantum force between muons and nucleons, resolving the proton charge radius puzzle. At same time, discrepancy measured anomalous magnetic moment of muon Standard Model prediction can be accommodated, thermal relic abundance candidate is consistent with observations. The mass MeV range. show that variety experimental ...

Bidimensional muonic and electronic atoms, with nuclei composed of a proton, deuteron, triton, governed by Chern-Simons potential, are numerically solved. Their eigenvalues eigenfunctions determined slightly modified Numerov method. Results compared those assuming that the same atoms usual $1/r$ potential even in two-dimensional space, as well its three-dimensional analogs.

The CREMA collaboration is pursuing a measurement of the ground-state hyperfine splitting (HFS) in muonic hydrogen ( \mu μ p) with 1 ppm accuracy by means pulsed laser spectroscopy to determine two-photon-exchange contribution 2\times10^{-4} display="inline">2...