We study the energy spectrum of the inclusive bottom-flavored mesons in top-quark decay into a charged-Higgs boson and a massless bottom quark at next-to-leading order (NLO) in the two-Higgs-doublet model. To extract the result we work in the Zero-Mass Variable-Flavor-Number scheme (ZM-VFNs) using realistic nonperturbative fragmentation functions obtained through a global fit to $e^{+}{e}^{-}$ data from CERN LEP1 and SLAC SLC on the Z-boson resonance. We study both the contribution of the bottom quark fragmentation and the gluon fragmentation to produce the bottom-flavored meson ($B$-Meson). We find that the contribution of the gluon leads to an appreciable reduction in decay rate at low values of the $B$-meson energy. It means the NLO corrections are significant.

• Received 7 October 2011

DOI:https://doi.org/10.1103/PhysRevD.85.054010