We have measured the differential cross sections for the reactions K − p → K 0 n, K − p → Λπ 0 and K − p → Λη , and the Λ polarization distribution for the second reaction, at K − lab momenta of 3.13, 3.30 and 3.59 GeV/ c . The K − p → Λπ 0 polarization is very large: for the combined data in the interval 0.1 < - t < 0.4 GeV 2 , it is 0.98 ± 0.15. The K − p → Λη forward peak is very steep: for the combined data, the slope b in d/d t = a e bt is 16.2 ± 2.3 GeV −2 , whereas it is about 3 GeV −2 for K − p → K 0 n and 5 GeV −2 for K − p → Λπ 0 . There is a dip near t = −0.5 GeV 2 in the K − p → Λη differential cross section , and another near u = −0.3 GeV 2 in the K − p → Λπ 0 differential cross section. The results are compared with predictions of simple models.
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We present differential cross-section data for the reaction π+p→π+p near 180° in the center-of-mass system at beam momenta between 3.25 GeVc and 10 GeVc.
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An investigation has been performed of some properties of Σ(1660) produced in the reaction K−p→Σ+(1660)π− at 2.87 GeV/c incident K− momentum. The decay modes observed for this state include Λ(1405)π and Σπ. The spin and parity are measured to be JP=32−. The differential cross section of the Λ(1405)π decay mode is sharply peaked in the forward direction, falling exponentially with a slope of 5.6 ± 0.7 (GeV/c)−2, while the slope for the Σ0π+ decay mode is 2.1 ± 0.4 (GeV/c)−2. The difference in the ratio of backward to total events for the two decay modes also suggests that two Σ(1660)'s exist.
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Channel cross sections have been determined for p p annihilations into final states containing 3 to 9 pions at 4.6 GeV/ c . The moments of both the charged and neutral pion multiplicity distributions are presented and model predictions are critically examined.
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We have measured the reaction cross section for p¯p→n¯n in small momentum steps between 0.97 and 3.13 Gev/c to a high level of statistical accuracy. Structures are observed in the vicinity of Plab=1.25 GeVc and 1.8 GeVc which are consistent with the structure observed in the p¯p total cross section.
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Single and joint decay angular distributions in the reaction p p → Δ ++ Δ ++ at 9.13 GeV/ c are discussed in the framework of single and double statistical tensors. The t dependence of 12 double statistical tensors is presented. Cross sections for p p → p p π + π − and p p → Δ ++ Δ ++ are determined to be 2.60 ± 0.10 and 0.90 ± 0.10 mb respectively. The results obtained are compared with other experiments mainly at 5.7 and 12 GeV/ c .
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FROM FITTING DECAY ANGULAR DISTRIBUTIONS OF BOTH ISOBARS ADDED.
We present results from a study of high-momentum inclusive hadron production in electron-positron interactions at s=3.8 and 4.8 GeV. Comparison of the momentum spectra at these energies shows no scaling violation in the region x(=EEbeam)>0.7. At s=4.8 GeV the Kπ ratio for hadrons with momenta >1.1 GeV/c is 0.27±0.08, and the average number of charged hadrons is 3.6±0.3 for those events which have at least one charged hadron with momentum greater than 1.1 GeV/c.
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In view of the possible production of heavy leptons or charmed states in e+e− collisions, we searched for anomalous muons with momenta pμ≳1 GeV/c. The inclusive cross section for nch>~3 has an upper limit of 96 pb (assuming isotropy). For nch=2 and noncoplanarity > 20°, an excess of muonic events is observed, corresponding to (dσdΩ)|90°=23−9+12 pb/sr; the probability that known processes produce the observed events is 2×10−4.
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We have measured the differential cross sections for K − p→ Σ + π − and K − p→ Σ − π + scattering, and the polarization distribution of the Σ + in the first reaction, at K − lab momenta of 3.13 and 3.30 GeV/ c . Our K − p→ Σ + π − cross sections are at least 40% larger than interpolations between measurements at nearby momenta. A comparison using isospin conservation of K − p →Σ + π − , K − p →Σ − π + , and K 0 p → Σ 0 π + cross sections favors our results. The K − p→ Σ + π − differential cross sections have about the same shape and are about twice as large as corresponding K − p→ Λπ 0 differential cross sections across the whole forward region. We discuss the results briefly with reference to simple exchange models.
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TMIN = 0.018 GEV**2. TMAX = 4.67 GEV**2.
TMIN = 0.017 GEV**2. TMAX = 4.98 GEV**2.
Neutron diffraction dissociation has been measured at the ISR in proton-neutron interactions at 37 GeV c.m. energy. The data were taken with the Split Field Magnet detector, during a short deuteron storage test run with colliding p-d beams. Differential mass and momentum transfer distributions are reported; the value of the total cross-section shows a weak s -dependence when compared to lower energy data.
ERROR IS MOSTLY SYSTEMATIC.
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