Neutralino dark matter in the left-right supersymmetric model

Abstract

We study the neutralino sector of the left-right supersymmetric model. In addition to the possibilities available in the minimal supersymmetric model, the neutralino states can be superpartners of the U1 BÿL gauge boson, the neutral SU2 R gauge boson, or of the Higgs triplets. We analyze neutralino masses and determine the parameter regions for which the lightest neutralino can be one of the new pure states. We then calculate the relic density of the dark matter for each of these states and impose the constraints coming from the parameter, the anomalous magnetic moment of the muon, b ! s, as well as general supersymmetric mass bounds. The lightest neutralino can be the bino, or the right-wino, or the neutral triplet Higgsino, all of which have different couplings to the standard model particles from the usual neutralinos. A light bino satisfies all the experimental constraints and would be the preferred dark matter candidate for light supersymmetric scalar masses, while the right-wino would be favored by intermediate supersymmetric mass scales. The neutral triplet Higgs fermion satisfies the experimental bounds only in a small region of the parameter space, for intermediate to heavy supersymmetric scalar masses.

Indirect detection of light neutralino dark matter in the next-to-minimal supersymmetric standard model

“…background) flux determination, a SUSY model giving a primary antimatter flux s can be discriminated at the 95% C.L. if (20) which is approximately valid for both positrons and antiprotons (though in the latter case the PAMELA experiment is expected to do slightly better). As a rule of thumb, the analogous quantity for AMS-02 should improve at least by 1 order of magnitude [37].…”

Single production of doubly charged Higgsinos at lineare−e−colliders

“…One must either invoke R-parity violation [3] and abandon the dark matter candidate, or add right-handed neutrinos and introduce the see-saw mechanism [4] . Supersymmetric grand unified theories (SUSY GUTs) which contain left-right supersymmetry resolve both problems naturally [5,6]. An added bonus of SUSY GUTs is that electromagnetic, weak and strong interactions unify at the same energy scale.…”

Doubly charged Higgsinos at the Tevatron

“…For the numerical estimates we have considered a representative point in the LRSUSY parameter space, favorable to observing light doubly charged Higgsinos, as tabulated in Table I. We chose a value for M BÀL significantly lower than other supersymmetry breaking parameters because it corresponds to the LSP as light, and mostly bino, thus obeying constraints from the relic density analysis for the neutralino [5]. This choice allows for light doubly charged fermions, of masses accessible at the Tevatron.…”

“…Therefore, the lightest supersymmetric particle (LSP) is automatically stable and it qualifies as a candidate for cold dark matter [5]. Therefore events with supersymmetric particles are generically accompanied by missing energy [6], a component taken away by the LSP.…”