  Treating the light-flavor constituent quarks and antiquarks that can well
describe the data of light-flavor hadrons in $pp$ collisions at $\sqrt{s}=7$
TeV as the underlying source of chromatically neutralizing the charm quarks of
low transverse momenta ($p_{T}$), we show that the experimental data of $p_{T}$
spectra of single-charm hadrons $D^{0,+}$, $D^{*+}$ $D_{s}^{+}$,
$\Lambda_{c}^{+}$ and $\Xi_{c}^{0}$ at mid-rapidity in the low $p_{T}$ range
($2\lesssim p_{T}\lesssim7$ GeV/$c$) in $pp$ collisions at $\sqrt{s}=7$ TeV can
be well understood by the equal-velocity combination of perturbatively-created
charm quarks and those light-flavor constituent quarks and antiquarks. This
suggests a possible new scenario of low $p_{T}$ charm quark hadronization, in
contrast to the traditional fragmentation mechanism, in $pp$ collisions at LHC
energies. This is also another support for the exhibition of the effective
constituent quark degrees of freedom for the small parton system created in
$pp$ collisions at LHC energies.
