High-Statistics Measurements Of The (P)Over-Bar-P ->(Lambda)Over-Bar-Lambda And (P)Over-Bar-P ->(Lambda)Over-Bar-Sigma(0)+Cc Reactions At Threshold
PHYSICAL REVIEW C（2000）
摘要
We report on precision measurements of the cross sections for the reactions (p) over barp--><()over bar>Lambda (p) over barp--><()over bar>Sigma (0), and (p) over barp-->Sigma (0)Lambda in the region below 5 MeV excess kinetic energy above reaction threshold. For the (p) over barp--><()over bar>Lambda measurement, the data represent a third and definitive scan through the threshold region by this experiment. Improvements in the detector system and analysis techniques, coupled with greatly increased statistics, have negated the question of the existence of a near-threshold resonance as had been indicated in our earlier, lower-statistics studies. The high statistics permit the first extraction of the polarization information at these low energies. We also report the first measurement of the cross section for the complementary reactions (p) over barp--><()over bar>Sigma (0)+c.c. at excess energies up to 2.5 MeV. This allows a comparison of the onset of <()over bar>Lambda production to that of <()over bar>Sigma (0) and <()over bar>(0)Lambda. The data show no evidence for near-threshold resonance structures in either reaction channel. Further, the (p) over barp--><()over bar>Sigma (0)+ c.c. reactions exhibit a larger P-wave fraction close to threshold compared to (p) over barp--><()over bar>Lambda.
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