Right-handed sneutrino dark matter in U(1)' seesaw model

par Jong-Chul Park (Seoul)

jeudi 23 juin 2011, 14:00 → 15:00 Europe/Paris

Auditorium M. Vivargent (LAPTH)

We suggest a real right-handed sneutrino, $\tilde N_1$, as a good dark matter candidate in a supersymmetric Z' model realizing the seesaw mechanism. When the extra gaugino, $\tilde Z'$, is lighter than Z', the thermal freeze-out of the dark matter annihilation to right-handed neutrinos, $\tilde{N}_1 \tilde{N}_1 \to NN$, through the t-channel $\tilde Z'$ 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. At the LHC, the search for the seesaw mechanism can be made by observing the signatures of $pp \to \tilde Z' \tilde Z' \to NN + pTmiss$ as $\tilde Z'$ can be copiously produced from the cascade decays of gluinos/squarks, which is complementary to the search of $pp\to Z' \to NN$. This may also open up a promising new channel of finding the Higgs boson from the displaced $N$ decay.

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