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Measurement ofγγψFinal States inψ′Decay

  • Author(s): Himel, TM
  • Abrams, GS
  • Alam, MS
  • Blocker, CA
  • Boyarski, AM
  • Breidenbach, M
  • Burke, DL
  • Carithers, WC
  • Chinowsky, W
  • Coles, MW
  • Cooper, S
  • Dieterle, WE
  • Dillon, JB
  • Dorenbosch, J
  • Dorfan, JM
  • Eaton, MW
  • Feldman, GJ
  • Franklin, MEB
  • Gidal, G
  • Goldhaber, G
  • Hanson, G
  • Hayes, KG
  • Hitlin, DG
  • Hollebeek, RJ
  • Innes, WR
  • Jaros, JA
  • Jenni, P
  • Johnson, AD
  • Kadyk, JA
  • Lankford, AJ
  • Larsen, RR
  • Levi, ME
  • Lüth, V
  • Millikan, RE
  • Nelson, ME
  • Pang, CY
  • Patrick, JF
  • Perl, ML
  • Richter, B
  • Roussarie, A
  • Scharre, DL
  • Schindler, RH
  • Schwitters, RF
  • Siegrist, JL
  • Strait, J
  • Taureg, H
  • Tonutti, M
  • Trilling, GH
  • Vella, EN
  • Vidal, RA
  • Videau, I
  • Weiss, JM
  • Zaccone, H
  • et al.

The decay mode ψ′→γγψ has been studied with the Mark-II detector at SPEAR. New measurements of branching ratios for decays of the type ψ′→γχ, χ→γψ involving known χ states are presented. The existence of a χ state of mass near 3455 MeV/c2 produced in this decay chain is not confirmed, and the upper limit (90% confidence level) of the product of branching ratios is measured to be 0.13%. A new decay mode, ψ′→π0ψ, which violates isospin conservation is observed with branching ratio (0.15±0.06)%. © 1980 The American Physical Society.

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