Production of multipion systems with large longitudinal momentum at the CERN intersecting storage rings

Inclusive cross sections are presented for 2..pi.. and 3..pi.. systems with large longitudinal x at the highest intersecting storage ring energies (..sqrt.. s = 53 GeV for 2..pi..; ..sqrt.. s = 53 and 62 GeV for 3..pi..). The ratio ..pi../sup +/..pi../sup -//..pi../sup -/..pi../sup -/ rises sharply with increasing x similar to the ratio K/sup +//K/sup -/, as expected in a quark-model interpretation.