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AbstractAbstract
[en] In a search for directly produced electrons from 64,000 π-p interactions at 70GeV/c using the Big European Bubble Chamber equipped with a Track Sensitive Target, 5 events with only one electron (positron) are found. In addition there are 12 events in which an e+e- pair was formed with an invariant mass greater than 135MeV. Backgrounds to both of these processes are small. The e+-/π+- ratio for the single electrons is found to be (3.1 +- 1.7)x 10-5. If the direct electrons are assumed to be products of charmed particle decay, the production cross section for pairs of charmed particles is calculated to be (19 +- 11)μb. It is also found that the e+-/π+- ratio from e+e- pairs (greater than 135MeV) is (0.88 +- 0.25)x 10-4. (author)
Primary Subject
Source
Jan 1980; 19 p; Bologna, Glasgow, Rutherford, Saclay, Torino Collaboration.
Record Type
Report
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Country of publication
DECAY, ELEMENTARY PARTICLES, ENERGY RANGE, GAS TRACK DETECTORS, GEV RANGE, HADRON-HADRON INTERACTIONS, INTERACTIONS, MEASURING INSTRUMENTS, MESON-BARYON INTERACTIONS, MESON-NUCLEON INTERACTIONS, NUCLEAR REACTIONS, PARTICLE INTERACTIONS, PARTICLE PRODUCTION, PION-NUCLEON INTERACTIONS, PION-PROTON INTERACTIONS, POSTULATED PARTICLES, RADIATION DETECTORS
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