Top quark decays with flavor violation in the B-LSSM

Abstract

The decays of top quark $t\to c\gamma ,t\to cg,t\to cZ,t\to ch$ are extremely rare processes in the standard model (SM). The predictions on the corresponding branching ratios in the SM are too small to be detected in the future, hence any measurable signal for the processes at the LHC is a smoking gun for new physics. In the extension of minimal supersymmetric standard model with an additional local $U(1{)}_{B-L}$ gauge symmetry (B-LSSM), new gauge interaction and new flavor changing interaction affect the theoretical evaluations on corresponding branching ratios of those processes. In this work, we analyze those processes in the B-LSSM, under a minimal flavor violating assumption for the soft breaking terms. Considering the constraints from updated experimental data, the numerical results imply $Br(t\to c\gamma )\sim 5\times 10^{-7}$, $Br(t\to cg)\sim 2\times 10^{-6}$, $Br(t\to cZ)\sim 4\times 10^{-7}$ and $Br(t\to ch)\sim 3\times 10^{-9}$ in our chosen parameter space. Simultaneously, new gauge coupling constants $g_{{}_B},g_{{}_{YB}}$ in the B-LSSM can also affect the numerical results of $Br(t\to c\gamma ,cg,cZ,ch)$.

20 pages, 4 figures, published in EPJC. arXiv admin note: substantial text overlap with arXiv:1803.09904

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• Search for flavour-changing neutral-current couplings between the top quark and the photon with the ATLAS detector at $\sqrt{s}=13$ TeV
• Search for flavour-changing neutral-current interactions of a top quark and a gluon in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Electroweak baryogenesis and electron EDM in the B-LSSM
• Higgs boson decays with lepton flavor violation in the $B-L$ symmetric SSM
• Electric dipole moments of neutron and heavy quarks in the B-L symmetric MSSM
• Leveraging on-shell interference to search for FCNCs of the top quark and the Z boson
• The naturalness in the BLMSSM and B-LSSM
• A mechanism relating the fermionic mass hierarchy to the flavor mixing
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