  We show that the recently observed suppression of the yield ratio of deuteron
to proton and of helium-3 to proton in p+p collisions compared to those in p+Pb
or Pb+Pb collisions by the ALICE Collaboration at the Large Hadron Collider
(LHC) can be explained if light nuclei are produced from the coalescence of
nucleons at the kinetic freeze-out of these collisions. This suppression is
attributed to the non-negligible sizes of deuteron and helium-3 compared to the
size of the nucleon emission source in collisions of small systems, which
reduces the overlap of their internal wave functions with those of nucleons.
The same model is also used to study the production of triton and hypertriton
in heavy-ion collisions at the LHC. Compared to helium-3 in events of low
charged particle multiplicity, the triton is less suppressed due to its smaller
size and the hypertriton is even more suppressed as a result of its much larger
size.
