Neutralino pair production at proton-proton collider

Abstract

In this paper we investigated the Drell-Yan process of the light neutralino pair $\tildeχ^0_{i}\tildeχ^0_{j}~(i,j=1,2)$ productions at hadron colliders. We studied the dependence of the coupling properties of two light neutralino $\tildeχ^0_{1,2}$ on the three SUSY Lagrangian parameters $M_1$, $M_2$ and $μ$, and find that the production rate of $\tildeχ^0_1 \tildeχ^0_2$ pair will be dominated by the Higgsino-like couplings under the condition $μ\ll M_2$ and $μ\sim M_1$, while the productions of $\tildeχ^0_1\tildeχ^0_1$ and $\tildeχ^0_2\tildeχ^0_2$ pairs will be enhanced by the gaugino-like couplings under $M_i \ll μ$. For the Higgsino-like $\tildeχ^0_{1,2}$ neutralinos, the cross section of $\tildeχ^0_1\tildeχ^0_2$ production at the LHC can reach $100~fb$.