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VOLUME 34 (1981) | ISSUE 11 | PAGE 621
Production of pion pairs with symmetric momenta in the transverse-momentum region 0.5\leq P_\perp 2.0 GeV/c in the pp collisions at 70 GeV
The slope of the invariant cross section of the process pp —► π + π~ +X varies near 1 GeV/c as a function of PL. If the slope is described by the sum of the two exponents, then the exponents must be equal to 12.3±0.9 (GeV/c)-1 and 8.7 =ь0.6 (GeV/c)~~l. The experimental values in the region PL> 1 GeV/c are much higher than the values predicted by the QCD model (Ref. 1) and by the CIM model (Ref. 2) for inelastic collisions.