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Resonance Production in 8 GeV/c pi+ Interactions in Hydrogen

1968
10 pages
Published in:
  • Nucl.Phys.B 4 (1968) 501-510
  • Published: 1968
DOI:
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Abstract: (Elsevier)
From the measurement of 30,000 two-prong and 30,000 four-prong events of 8 GeV/ c π + -p interactions, resonance production has been studied. A peak is observed in the ( π + π o ) mass distribution near 1630 MeV. No enhancement is observed in the ( π + π + ) mass distribution in the reaction π + p → n π + π + . A broad enhancement from 1000 to 1400 MeV is observed in the ( π + π + π − ) effective mass distribution in the reaction π + p → p π + π + π − ; no clear evidence is seen for a splitting of this enhancement into the A 1 and A 2 mesons. Alternative decay modes of the A enhancement into πη, πη′ and K K are discussed. Evidence is presented for a (3π) resonance observed near 1660 MeV which appears to decay partly into ( π + f o . A broad enhancement in the ( π + ω ) mass distribution is observed near 1260 MeV.