TY - JOUR
T1 - QCD correction to neutralino annihilation process and dark matter density in supersymmetric models
AU - Moroi, Takeo
AU - Sumino, Yukinari
AU - Yotsuyanagi, Akira
PY - 2006
Y1 - 2006
N2 - We calculate QCD correction to the neutralino annihilation cross section into quark antiquark final state and discuss its implications to the calculation of neutralino relic density. We see that the QCD correction enhances the pair-annihilation cross section by O(10%) when final-state quarks are nonrelativistic. Consequently, when the lightest neutralinos dominantly annihilate into a tt̄ pair, the relic density of the lightest neutralino is significantly affected by the QCD correction, in particular, when the lightest-neutralino mass is close to the top-quark mass.
AB - We calculate QCD correction to the neutralino annihilation cross section into quark antiquark final state and discuss its implications to the calculation of neutralino relic density. We see that the QCD correction enhances the pair-annihilation cross section by O(10%) when final-state quarks are nonrelativistic. Consequently, when the lightest neutralinos dominantly annihilate into a tt̄ pair, the relic density of the lightest neutralino is significantly affected by the QCD correction, in particular, when the lightest-neutralino mass is close to the top-quark mass.
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U2 - 10.1103/PhysRevD.74.015016
DO - 10.1103/PhysRevD.74.015016
M3 - Article
AN - SCOPUS:33746561196
SN - 1550-7998
VL - 74
JO - Physical Review D - Particles, Fields, Gravitation and Cosmology
JF - Physical Review D - Particles, Fields, Gravitation and Cosmology
IS - 1
M1 - 015016
ER -