Multiplicities in semi-inclusive deep-inelastic scattering are presented for each charge state of ${\pi }^{\pm }$ and ${\mathrm{K}}^{\pm }$ mesons. The data were collected by the HERMES experiment at the HERA storage ring using 27.6 GeV electron and positron beams incident on a hydrogen or deuterium gas target. The results are presented as a function of the kinematic quantities $x_{\mathrm{B}}$, $Q^2$, $z$, and $P_{h\perp }$. They represent a unique data set for identified hadrons that will significantly enhance our understanding of the fragmentation of quarks into final-state hadrons in deep-inelastic scattering.

• Received 27 December 2012

DOI:https://doi.org/10.1103/PhysRevD.87.074029