Search for Ambient Neutralino Dark Matter at Accelerator

We investigate the possibility of using accelarator beam particles to collide with the ambient neutralino dark matter particles in cosmic rays as a way to search for the cold dark matter. We study in detail its inelastic and elastic scattering with the projectile particles at electron-positron colliders and discuss the possible experimental signals and the relevent background. There is strong evidence for the existence of a large amount of cold dark matter (CDM) in the universe. The leading candidate of the cold dark matter particles in the minimal supersymmetric standard model with R parity is neutralino [1, 2]. The possibility of sneutrino being a candidate of CDM is ruled out unless it as heavy as 17 TeV which is unfavorable in all resonable theories[4, 5]. In the traditional method of directly searching for such CDM SUSY particles, the velocity of the SUSY CDM particles is very small [3], their kinetic energy is not sufficient to cause any inelastic scattering, so that a clear observation would be difficult due to existence of a flood of background trajectories. In this paper we propose a new detection mechanism of neutralino cold dark matter by using the accelarator beam particles to collide