We use a slave-boson approach to study the band renormalization and pair susceptibility in the normal state of iron-based superconductors in presence of strong Coulomb repulsion and Hund's interaction. Our results show orbital selectivity toward localization of $xy$ orbitals and its interplay with superconductivity. We also compare the recently proposed triplet resonating valence bond (tRVB) theory of superconductivity in iron-based superconductors with the more conventional $s_{\pm }$ pairing. We show that both favor a superconductivity when the $xy$ orbital is delocalized, but the tRVB superconductivity supports a second weaker dome when $xy$ orbital is localized.

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• Orbital order
• Spin-triplet pairing
• Iron-based superconductors
• Unconventional superconductors
• Electron-correlation calculations
• Slave bosons