Evidence for two isospin zero J ^PC=2⁻⁺ mesons at 1645 and 1875 MeV

Data on $$\bar pp \to \eta \pi ^0 \pi ^0 \pi ^0 $$ taken at beam momenta of 1.2 and 1.94 GeV/c reveal evidence for twoI=0J PC=2−+ resonances inηππ. The first, at 1645±14(stat.)±15(syst.) MeV with width 180 −21 +40 ±25 MeV, decays toα 2(1320)π withL=0. It may be interpreted as the $$q\bar q^1 $$ D 2 partner ofπ 2(1670). A strong signal is also observed just above threshold inf 2(1270)η withL=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 havingJ PC=2++ is observed at 2135±20±45 MeV withΛ=250±25±45 MeV, decaying to botha 2(1320)π andf 2(1270)η withL=1. There is no evidence for resonances with decays toa 0(980)π, ση orf 0(980)η.