Mass Spectrum of Bosons from 500 to 2500 MeV in the Reactionπ−+p→p+X−Observed by a Missing-Mass Spectrome

Split Peaks and Exotic Resonances

“…With the "notch" the p appears as a twin peak, thereby suggesting that other twin peaks in nature arise from similar causes. Since a double peaking has been observed in the A 2 -meson resonance 2 we conjecture that this also arises from a destructive interference in the decays of two different resonances, coherently produced, into the same final state.…”

Theoretical Discussions Concerningη′−δDegeneracy

“…-The charged 6 have been observed through the reactions ir~~+p -~p + 6~ by Focacci et al 1 and/) +p -d+ 6 + by Oostens et al, 2 while 6° has not yet been seen. It is not known experimentally what the decay products are.…”

“…The dominant decay modes are pu and 3TT; in the case of the charged 5, the decay product contains one charged particle (lc) or three charged particles (3c) with comparable probability, consistent with preliminary data. 1 The explanation of mass degeneracy and the observed small production cross section becomes, however, less transparent. In this case, it would be most interesting to look for the other members of the multiplet.…”

“…If I (1) and I (2) are the generators of the two SU(2) groups, then we identify, following Pais, 6 isospin with j u> + j (2). i n other words, the isospin subgroup consists of elements of the form (u,u).…”

Detailed Structure of the Reactions inp¯p→π+π−Nicholson1, Barish2, Pine3 et al. 1969Phys. Rev. Lett.45000View full textAdd to dashboardCite

“…Boson resonances in this energy region have been reported by the CERN missing-mass spectrometer group 14 ; they are the T and U reso-* nances with widths less than 0.015 and 0.024 GeV, respectively. While our data do indicate that these resonances couple very weakly to this pp channel, it is possible that our energy resolution is too coarse to reveal their presence.…”