Figure 2

The distance of closest approach ($dca$) distributions of $\rm{p}$and $\overline{\rm{p}}$ for the lowest (left plot) and highest (right plot) transverse momentum bins. The broad background of protons at low momentum originates from secondary particles created in the detector material, whereas the tails for both $\rm{p}$ and $\overline{\rm{p}}$ at high momentum (and for $\overline{\rm{p}}$ at low momentum) arise from weak hyperon decays.