We suggest that supersymmetric dark matter be used to set the energy scale of a linear e+e- collider. Assuming that the lightest supersymmetric particle (LSP) is a stable neutralino χ, as in many incarnations of the MSSM with conserved R parity, previous calculations that include coannihilation effects have delineated the region of the (m(1/2),m0) plane where the LSP cosmological relic density lies in the preferred range 0.1 ≤ Ω(x)h2 ≤ 0.3. We evaluate here the total cross section for e+e- → visible pairs of supersymmetric particles, for different values of m(1/2) and m0, and investigate how much of the dark matter region can be explored by e+e- colliders with different centre-of-mass energies E(CM). We find that a collider with E(CM) = 500 GeV or 1 TeV can only explore part of the cosmological region, and that a collider with E(CM) = 1.5 TeV with sufficient luminosity can explore all of the supersymmetric dark matter region. (C) 2000 Published by Elsevier Science B.V.
|Original language||English (US)|
|Number of pages||9|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - Feb 17 2000|
Bibliographical noteFunding Information:
We thank Toby Falk for many related discussions. The work of K.A.O. was supported in part by DOE grant DE–FG02–94ER–40823.