Evidence for two isospin zeroJPC=2−+ mesons at 1645 and 1875 MeV

Link:
Erscheinungsjahr:
1996
Medientyp:
Text
Beschreibung:
  • Data on pp̄ → ηπ0π0π0 taken at beam momenta of 1.2 and 1.94 GeV/c reveal evidence for two I = 0 JPC = 2-+ resonances in ηππ. The first, at 1645 ± 14(stat.) ± 15(syst.) MeV with width 180 -21+40 ± 25 MeV, decays to a2(1320)π with L = 0. It may be interpreted as the qq̄ 1D2 partner of π2(1670). A strong signal is also observed just above threshold in f2(1270)η with L = 0. It is 11-22 times stronger than is expected for the high mass tail of the 1645 MeV resonance. It can be fitted as a second 2-+ resonance at 1875 ± 20 ± 35 MeV with width 200 ± 25 ± 45 MeV. A third resonance having JPC = 2++ is observed at 2135 ± 20±45 MeV with Γ = 250±25±45 MeV, decaying to both a2(1320)π and f2(1270)η with L = 1. There is no evidence for resonances with decays to a0(980)π, ση or f0(980)η. © Springer-Verlag 1996.
Lizenz:
  • info:eu-repo/semantics/closedAccess
Quellsystem:
Forschungsinformationssystem der UHH
Interne Metadaten
Quelldatensatz
oai:www.edit.fis.uni-hamburg.de:publications/5c80d5d2-d09d-4a20-824c-9908e5747c6b