Constraints on long-lived electrically charged massive particles from
  anomalous strong lens systems
  We investigate anomalous strong lens systems, particularly the effects of
weak lensing by structures in the line of sight, in models with long-lived
electrically charged massive particles (CHAMPs). In such models, matter density
perturbations are suppressed through the acoustic damping and the flux ratio of
lens systems are impacted, from which we can constrain the nature of CHAMPs.
For this purpose, first we perform $N$-body simulations and develop a fitting
formula to obtain non-linear matter power spectra in models where cold neutral
dark matter and CHAMPs coexist in the early Universe. By using the observed
anomalous quadruple lens samples, we obtained the constraints on the lifetime
($\tau_{\rm Ch}$) and the mass density fraction ($r_{\rm Ch}$) of CHAMPs. We
show that, for $r_{\rm Ch}=1$, the lifetime is bounded as $\tau_{\rm Ch} <
0.96\,$yr (95% confidence level), while a longer lifetime $\tau_{\rm Ch} =
10\,$yr is allowed when $r_{\rm Ch} < 0.5$ at the 95% confidence level.
Implications of our result for particle physics models are also discussed.
