Abstract
We have searched for charge-13 and charge-23 particles produced with large p in 400-GeV proton-Cu collisions. At p=6.15 GeV/c, 4.9 × 104 positive and 1.5 × 104 negative unit-charge particles provided the normalization; no fractionally charged particles were found. The 90%-confidence-level upper limits for the invariant production cross sections per nucleon for positive and negative charge-13 particles are 5.1 × 10-39 and 8.8 × 10-39 cm2 GeV-2, respectively; for charge-23 particles the respective limits are 1.3 × 10-39 and 2.2 × 10-39 cm2 GeV-2.
Original language | English (US) |
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Pages (from-to) | 513-515 |
Number of pages | 3 |
Journal | Physical review letters |
Volume | 39 |
Issue number | 9 |
DOIs | |
State | Published - 1977 |
Externally published | Yes |