One-loop SQCD corrections to the decay of top squarks to charm and neutralino in the generic MSSM

Aebischer, Jason; Crivellin, Andreas; Greub, Christoph (2015). One-loop SQCD corrections to the decay of top squarks to charm and neutralino in the generic MSSM. Physical review. D - particles, fields, gravitation, and cosmology, 91(3), 035010. Melville, N.Y.: American Physical Society 10.1103/PhysRevD.91.035010

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In this article we calculate the one-loop supersymmetric QCD (SQCD) corrections to the decay u˜1→cχ˜01 in the minimal supersymmetric standard model with generic flavor structure. This decay mode is phenomenologically important if the mass difference between the lightest squark u˜1 (which is assumed to be mainly stoplike) and the neutralino lightest supersymmetric particle χ˜01 is smaller than the top mass. In such a scenario u˜1→tχ˜01 is kinematically not allowed and searches for u˜1→Wbχ˜01 and u˜1→cχ˜01 are performed. A large decay rate for u˜1→cχ˜01 can weaken the LHC bounds from u˜1→Wbχ01 which are usually obtained under the assumption Br[u˜1→Wbχ01]=100%. We find the SQCD corrections enhance Γ[u˜1→cχ˜01] by approximately 10% if the flavor violation originates from bilinear terms. If flavor violation originates from trilinear terms, the effect can be ±50% or more, depending on the sign of At. We note that connecting a theory of supersymmetry breaking to LHC observables, the shift from the DR¯¯¯¯¯ to the on-shell mass is numerically very important for light stop decays.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Albert Einstein Center for Fundamental Physics (AEC)
08 Faculty of Science > Institute of Theoretical Physics

UniBE Contributor:

Aebischer, Jason; Crivellin, Andreas and Greub, Christoph

Subjects:

500 Science > 530 Physics

ISSN:

1550-7998

Publisher:

American Physical Society

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

11 Mar 2015 14:27

Last Modified:

11 Mar 2015 14:27

Publisher DOI:

10.1103/PhysRevD.91.035010

BORIS DOI:

10.7892/boris.64207

URI:

https://boris.unibe.ch/id/eprint/64207

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