SUSY-QCD corrections to squark annihilation into gluons and light quarks

SUSY-QCD corrections in the squark–gluino sector

A status report is given of the calculations of next-to-leading-order (N = 1) supersymmetric QCD corrections to the production of squarks and gluinos in pp̄/pp collisions. The implementation of these SUSY-QCD corrections leads to more stable theoretical predictions and to a substantial increase of the production cross-sections. In addition we give a discussion of the use of the MS scheme for ren...

Improved SUSY QCD corrections to Higgs boson decays into quarks and squarks

We improve the calculation of the supersymmetric O(αs) QCD corrections to the decays of Higgs bosons into quarks and squarks in the Minimal Supersymmetric Standard Model. In the on–shell renormalization scheme these corrections can be very large, which makes the perturbative expansion unreliable. This is especially serious for decays into bottom quarks and squarks for large tan β. Their correct...

SUSY-QCD corrections to stop annihilation into electroweak final states including Coulomb enhancement effects

One-loop QCD corrections to top quark decay into a neutralino and light stop squark.

We calculate the one-loop QCD corrections to t → t̃1χ̃0j using dimensional reduction scheme, including QCD and supersymmetric QCD corrections. The analytic expressions for the corrections to the decay width are given, which can easily be extended to t → χ̃+j b̃i. The numerical results show that the correction amounts to more than a 10% reduction in the partial width relative to the tree level resul...

Neutralino annihilation into gluons.

We present a complete calculation of the cross section for neutralino annihilation into the two-gluon final state. This channel can be quite important for the phenomenology of neutralino annihilation due to the well-known helicity suppression of neutralino annihilation into light quarks and leptons. In addition, we calculate the cross section for annihilation of neutralinos into a gluon and qua...