1993/07/01 by Manuel Drees, M. Drees, Mihoko M. Nojiri +1 · 15 citations
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1103/physrevd.48.3483
published as Phys.Rev.D48:3483-3501,1993 · 32 pages with 7 figures (not included; hard copies available from DREES@WISCPHEN), LaTeX with EQUATION.STY, MAD/PH/768
arxiv created 1993/07/01 · openalex publication_date 1993/10/15 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We present a detailed discussion of the elastic scattering of a supersymmetric neutralino off a nucleon or nucleus, with emphasis on the spin-independent interaction. We carefully treat QCD effects on the squark exchange contribution. In particular, we identify a class of terms that survive even in the absence of mixing in both the neutralino and squark sectors; the corresponding quark and gluon operators also appear in analyses of deep-inelastic lepton-nucleon scattering ("twist-2 operators"), so their hadronic matrix elements are well known. We also reemphasize the importance of mixing between the superpartners of left- and right-handed quarks, and of the contribution from the heavier scalar Higgs boson. We use our refined calculation of the scattering amplitude to update predictions of signal rates for cosmic relic neutralino searches with germanium detectors. In general the counting rate varies strongly with the values (even the signs) of model parameters; typical results lie between a few times 10^\ensuremath-4 and a few times 10^\ensuremath-1 events/(kg day).