Right-handed sneutrino dark matter in \(\mathrm{U}(1)'\) seesaw models and its signatures at the LHC

Abstract: We suggest a real right-handed sneutrino,

i l d e N_{1}

, as a good dark matter candidate in a supersymmetric

Z^{'}

model realizing the seesaw mechanism. When the extra gaugino,

i l d e Z^{'}

, is lighter than

Z^{'}

, the thermal freeze-out of the dark matter annihilation to right-handed neutrinos,

i l d e N_{1} i l d e N_{1} o N N

, through the

t

-channel

i l d e 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

p p o i l d e Z^{'} i l d e Z^{'} o N N + p t m i s s

as

i l d e Z^{'}

can be copiously produced from the cascade decays of gluinos/squarks, which is complementary to the search of

p p o Z^{'} o N N

. This may also open up a promising new channel of finding the Higgs boson from the displaced

N

decay.

Cites Work