One-loop corrections to neutralino-stop coannihilation revisited
نویسندگان
چکیده
منابع مشابه
Neutralino-stop coannihilation in the CMSSM
Neutralino as the lightest supersymmetric particle (LSP) is a candidate for supersymmetric dark matter. It is known that coannihilation effects could be important in neutralino relic density calculation. Here we present some results on neutralino-stop coannihilation in the CMSSM. In this model, the stop t̃1 can be degenerate with the lightest neutralino χ when |A0| 6= 0 and large, more specifica...
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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...
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We calculate the one-loop QCD corrections to t → t̃1χ̃0j , 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 result. We also compare the corrections...
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We present detailed calculations of the χ̃t̃1 coannihilation channels that have the largest impact on the relic χ̃ density in the constrained minimal supersymmetric extension of the Standard Model (CMSSM), in which scalar masses m0, gaugino masses m1/2 and the trilinear soft supersymmetry-breaking parameters A0 are each assumed to be universal at some input grand unification scale. The most import...
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The extracted value of the relic density has reached the few percent level precision. One can therefore no longer content oneself with calculations of this observable where the annihilation processes are computed at tree level, especially in supersymmetry where radiative corrections are usually large. Implementing full one-loop corrections to all annihilation processes that would be needed in a...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2015
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.91.034028