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BREIT-WIGNER RESONANCE FITS WITH BACKGROUND.
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CROSS SECTIONS VERY SENSITIVE TO BACKGROUND SUBTRACTION.
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We have made measurements of polarization in π−p elastic scattering, with emphasis over the backward region, at 1.60 to 2.28 GeVc. The results indicate the absence of u-channel dominance in the backward region, as was observed in the case of π+p scattering. Comparisons have been made with predictions of various phase-shift analyses which show that the agreement is generally very poor in the backward region.
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We have studied antiproton-deuteron elastic scattering between 1.60 and 2.00 GeV/c incident momenta. The differential cross sections may be characterized by a very steep forward peak (with b∼43 GeV−2) and a prominent break near −t∼0.2 GeV2. The results are used to test the validity of Glauber's multiple-scattering theory. Within the experimental range of measurements (−t between 0.028 and 0.46 GeV2), the theory provides a good qualitative description of the data.
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Total and differential elastic cross-section data are presented at eight incident π+ momenta: 1.28, 1.34, 1.40, 1.43, 1.55, 1.68, 1.77, and 1.84 GeVc. These data were obtained from a hydrogen-bubble-chamber exposure at the Bevatron, and contain more than 65 000 events. This represents more than 1½ times the world's data hitherto available in this energy region.
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