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Measurements of inclusive scattering in the target-fragmentation region are extended to higher incident energy. The combined data set shows departures from an approach to the asymptotic scaling limit as A + BS-"~ that are significant even at the highest energies. When these departures are taken into account, the data approach a limit that is consistent with equal cross sections induced by particles and antiparticles and with Pomeron factorization. The corrections to A + BS-"~ are so large that detailed tests of Mueller-Regge relationships are not conclusive.

We have measured the polarization parameter and differential cross sections in K + p elastic scattering from a polarized target from small \t I and small \u I at five momentum points: 1.7, 2.1, 2.4, 2.7, and 3.0 GeV/c. The polarized-proton target was butanol cooled at 0.5° by a 3 He-4 He refrigerator; a combination of multiwire proportional chambers and scintillation counters detected the scattered particles. The results for small \u\ are discussed in the context of pure Regge-pole models with exchange-degenerate A trajectories.Amplitudes for K + p elastic scattering construct ed from pure pole exchange in the u channel, with degenerate A and £ trajectories, yield predictions of zero polarization in the backward direction (small \u\) and a monotonic energy dependence of the 180° differential cross sections. 1 While published measurements indicate small backward polarizations, they are of limited statistical accuracy and do not extend above 2.1 GeV/c in incident beam momentum. 2 Previous measurements of the 180° cross sections, 3 as a function of beam momentum, have shown a deviation from the monotonic behavior predicted by such models. 4 This anomaly, occurring between 2 and 3 GeV/c laboratory momenta, might be due to unexplained structure in the amplitudes, possible systematic errors in previous experiments, 5 or a combination of the two. Our measurements were thus made in order to resolve these questions and to test the hypotheses of a pure pole-exchange Regge model.Since the forward-to-backward ratio of differential cross sections is large in K + p elastic scattering, we have also measured polarizations and angular distributions in the forward direction with significantly higher statistical accuracy than previously obtained. 2 The apparatus is shown in Fig.

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