2011/05/31 by Priyotosh Bandyopadhyay, Eung Jin Chun, Jong-Chul Park
Physics and Astronomy · #hep-ph #astro-ph.CO #astro-ph.HE #hep-ex
paper · pdf · doi:10.1007/jhep06(2011)129
published as JHEP 1106:129,2011 · 1+24 pages, 15 figures. v2: minor improvements, typos fixed, updated references, version published in JHEP
arxiv created 2011/07/06 · arxiv updated 2011/08/11
We suggest a real right-handed sneutrino, N1, as a good dark matter candidate in a supersymmetric Z' model realizing the seesaw mechanism. When the extra gaugino, Z', is lighter than Z', the thermal freeze-out of the dark matter annihilation to right-handed neutrinos, N1 N1 → NN, through the t-channel Z' exchange is shown to produce the right dark matter density. It is essential to include the decay and inverse decay of N in this process, otherwise N decouples too early and thus dark matter is overproduced. At the LHC, the search for the seesaw mechanism can be made by observing the signatures of pp → Z' Z' → NN + \ptmiss as Z' can be copiously produced from the cascade decays of gluinos/squarks, which is complementary to the search of pp→ Z' → NN. This may also open up a promising new channel of finding the Higgs boson from the displaced N decay.