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A high statistics measurement of the Lambda(+)(c) lifetime from the Fermilab fixed-target FOCUS photoproduction experiment is presented. We describe the analysis technique with particular attention to the determination of the systematic uncertainty. The measured value of 204.6 +/- 3.4 (stat) +/- 2.5 (syst) fs from 8034 +/- 122 Lambda(+)(c)-->pK(-)pi(+) decays represents a significant improvement over the present world average.  相似文献   
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We present a study of pp collisions producing large transverse momentum π0's. The data collected at c.m. energies √s=52.4 and 62.7 GeV, give evidence for a two-jet structure. The fragmentation of the jets is studied and correlations between the two jets are investigated. Results are compared with e+e? and νp data.  相似文献   
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The production of single electrons of transverse momentum between 1.8 and 45 GeV/c is measured in pp collisions at √s=53 and 63 GeV. Contributions from ?,ω,?,ψ, ?, DD? and Drell-Yan pairs are deduced from measurements in the same apparatus.  相似文献   
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The cross section for the reaction e++e?→e++e?+γ has been measured at the Adone storage ring. The results in agreement with the QED predictions, establish a new limit for the mass and the coupling constant e1eγ of a heavy electron e1.  相似文献   
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