2019-03-29 11:00  P7F

How Heavy can Neutralino Dark Matter be?

Hajime Fukuda

Supersymmetry is one of the most motivated candidate of physics beyond the standard model. Under the reasonable assumption that R-parity is conserved and the Universe is once sufficiently hot, the lightest supersymmetric particle (LSP) becomes the cosmic dark matter in the current Universe by the thermal freeze-out mechanism. In the thermal freeze-out mechanism, the smaller the annihilation cross section of the dark matter is, the larger the abundance is. In this work, we calculate the upper bound of the LSP annihilation cross section for the coannihilation scenario taking the non-perturbative QCD effect into consideration and show that the bino as heavy as a few hundred TeV. We also discuss the possibility of the detection of such heavy dark matter.