Multiplicities of charged pions and unidentified hadrons produced in
deep-inelastic scattering were measured in bins of the Bjorken scaling variable
$x$, the relative virtual-photon energy $y$ and the relative hadron energy $z$.
Data were obtained by the COMPASS Collaboration using a 160 GeV muon beam and
an isoscalar target ($^6$LiD). They cover the kinematic domain in the photon
virtuality $Q^2$ > 1(GeV/c$)^2$, $0.004 < x < 0.4$, $0.2 < z < 0.85$ and $0.1 <
y < 0.7$. In addition, a leading-order pQCD analysis was performed using the
pion multiplicity results to extract quark fragmentation functions.
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