Evidence for decays of the D- and e-mesons into σπ in p annihilation at 700 MeV/c

E decays to ηππ in annihilation at rest

“…KK) B(a 0 ! ) = 0 :54 0:18 (11) while the corresponding MARK III ratio in radiative J= decay i s 1 :3 0:6 f o r t h e l o west state in the structure 6,10]. Our result eqn.11 is in good agreement with the estimate 0.37 0.07 determined from other data 27].…”

Identification of the glueballs and the scalar meson nonet of lowest mass

“…The branching fraction B( a 0 → ηπ ) is not determined satisfactorily because of conflicting analyses by Bugg et al [94] , Corden et al [95] and Defoix et al [96], but the PDG classifies the ηπ mode as "dominant". We conclude from the measurement in Eq.…”

“…Mark-III : (4.8 ± 0.6 ± 0.9) 10 −4 ; DM2 : (4.6 ± 0.7 ± 0.7) 10 −4 (96) From the branching fractions in Eqs. ( 93) -( 96) we obtain the following ratio in comparison with the PDG result:…”

Partial-wave analysis of theηπ+π−system produced in the reactionManak1, Adams2, Bishop3 et al. 2000Phys. Rev. D162100View full textAdd to dashboardCite

“…Historically, the low-mass region around the 1300 MeV/c 2 enhancement in the ηπ + π − and KKπ mass spectra was called the D region. Most early analyses [1][2][3][4][5][6] made the assumption that a single state existed in this region in the presence of an incoherent (non-interfering)…”

“…This observation has implications on the f 1 → ηππ branching fraction. Previous experiments[1,2,5,6] have determined the f 1 → ηππ branching fraction without the aid of a partial wave analysis under the assumption that the low-mass peak consists of a single f 1 state resting on top of an incoherent background. This assumption is clearly incorrect, and values for the earlier determinations of the branching fractions need to be corrected.Corden et al[2] studied the reactions π − p → ηπ + π − n and π − p → KKπn at 15 GeV/c.…”