QCD Corrections to Scalar Quark Decays

In supersymmetric theories, the main decay modes of scalar quarks are decays into quarks plus charginos or neutralinos, if the gluinos are heavy enough. We calculate the $O({\ensuremath{\alpha}}_{s})$ QCD corrections to these decay modes in the minimal supersymmetric extension of the standard model. In the case of scalar top and bottom quarks, where mixing effects can be important, these corrections can reach values of the order of a few ten percent. They can be either positive or negative and increase logarithmically with the gluino mass. For the scalar partners of light quarks, the corrections do not exceed in general the level of ten percent for gluino masses less than 1 TeV.

[1]  W. Siegel.  Supersymmetric Dimensional Regularization via Dimensional Reduction , 1979 .

[2]  Howard E. Haber,et al.  The Search for Supersymmetry: Probing Physics Beyond the Standard Model , 1985 .

[3]  A. Ribon,et al.  Observation of top quark production in $\bar{p}p$ collisions , 1995 .

[4]  Ciulli,et al.  Search for supersymmetric particles in e + e (cid:0) collisions at centre-of-mass energies of 130 and 136 GeV , 2018 .

[5]  J. S. Hoftun,et al.  SEARCH FOR LIGHT TOP SQUARKS IN PP COLLISIONS AT S = 1.8 TEV , 1996 .

[6]  Supersymmetric grand unified theories: Two-loop evolution of gauge and Yukawa couplings. , 1992, Physical review. D, Particles and fields.

[7]  P. Breitenlohner,et al.  Dimensional renormalization and the action principle , 1977 .

[8]  R. Arnowitt,et al.  Applied N=1 Supergravity: (Volume 1) , 1984 .

[9]  Yang,et al.  One-loop QCD corrections to top quark decay into a neutralino and light stop squark. , 1996, Physical review. D, Particles and fields.

[10]  A. Bartl,et al.  SUSY-QCD corrections to scalar quark pair production in e+e− annihilation , 1996 .

[11]  Kobayashi,et al.  Light scalar top quark at e+e- colliders. , 1987, Physical review. D, Particles and fields.

[12]  K. Hikasa,et al.  Scalar top production in e+e− annihilation , 1990 .

[13]  G. J. van Oldenborgh,et al.  FF — a package to evaluate one-loop Feynman diagrams , 1991 .

[14]  A. Bartl,et al.  Signatures of gluinos and squarks at proton-proton colliders , 1991 .

[15]  M. Veltman,et al.  One-loop corrections for e + e - annihilation into μ + μ - in the Weinberg model , 1979 .

[16]  Howard E. Haber,et al.  Higgs bosons in supersymmetric models, 1 , 1986 .

[17]  Stephen P. Martin,et al.  Regularization dependence of running couplings in softly broken supersymmetry , 1993 .

[18]  W. Beenakker,et al.  SUSY-QCD decays of squarks and gluinos , 1996 .

[19]  J. Ellis,et al.  Search for Supersymmetry in Toponium Decays , 1983 .

[20]  P. Nieuwenhuizen,et al.  Regularization by dimensional reduction of supersymmetric and non-supersymmetric gauge theories , 1980 .

[21]  On the unification of couplings in the minimal supersymmetric standard model , 1993, hep-ph/9303202.

[22]  Djouadi,et al.  QCD corrections to the top quark decay mode t-->t-tilde chi 0. , 1996, Physical review. D, Particles and fields.

[23]  G. Hooft,et al.  Regularization and Renormalization of Gauge Fields , 1972 .

[24]  Baer,et al.  Detecting gluinos at hadron supercolliders. , 1987, Physical review. D, Particles and fields.

[25]  A. Denner.  Techniques for the Calculation of Electroweak Radiative Corrections at the One‐Loop Level and Results for W‐physics at LEP 200 , 2007, 0709.1075.

[26]  A. Bartl,et al.  SUSY QCD corrections to scalar quark decays into charginos and neutralinos , 1996 .

[27]  G. Mitchell,et al.  Amplitude correlations in nuclear resonance spectroscopy , 1985 .