https://doi.org/10.1140/epjc/s10052-014-3058-1
Regular Article - Theoretical Physics
SUSY induced top quark FCNC decay 
after Run I of LHC
1
Department of Physics, Henan Normal University, Xinxiang, 453007, China
2
Center for High Energy Physics, Peking University, Beijing, 100871, China
3
State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Academia Sinica, Beijing, 100190, China
4
Asia Pacific Center for Theoretical Physics, San 31, Hyoja-dong, Nam-gu, Pohang, 790-784, Republic of Korea
5
ARC Center of Excellence for Particle Physics at the Terascale, School of Physics, The University of Sydney, Sydney, NSW, 2006, Australia
* e-mail: mczhang@itp.ac.cn
Received:
24
June
2014
Accepted:
31
August
2014
Published online:
18
September
2014
In light of the Higgs discovery and the nonobservation of sparticles at the LHC, we revisit the supersymmetric theory (SUSY) induced top quark flavor-changing decay into the Higgs boson. We perform a scan over the relevant SUSY parameter space by considering the constraints from the Higgs mass measurement, the LHC search for SUSY, the vacuum stability, the precision electroweak observables as well as 
. We make the following observations: (1) In the Minimal Supersymmetric Standard Model (MSSM), the branching ratio of 
can only reach 
, which is about one order smaller than previous results obtained before the advent of the LHC. Among the considered constraints, the Higgs mass and the LHC search for sparticles are found to play an important role in limiting the prediction. (2) In the singlet extension of the MSSM, since the squark sector is less constrained by the Higgs mass, the branching ratio of 
can reach the order of 
in the allowed parameter space. (3) The chiral-conserving mixings 
and 
may have remanent effects on in the heavy SUSY limit. In the MSSM with squarks above 3 TeV and gluino above 4 TeV and meanwhile the CP-odd Higgs boson mass around 1 TeV, the branching ratio of 
can still reach the order of 
under the constraints.
© SIF and Springer-Verlag Berlin Heidelberg, 2014
