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Title:Observation of Eta-C and Other Structures in the Radiative Decay Psi to Gamma Eta Negative Pion Positive Pion
Author(s):Becker, Jeffrey Jay
Department / Program:Physics
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Physics, Elementary Particles and High Energy
Abstract:The Mark III detector at SPEAR was used to observe the exclusive radiative decay (psi) (--->) (gamma)(eta)(pi)('+)(pi)('-). The (eta)(,c) was seen as an intermediate state in this decay, (psi) (--->) (gamma)(eta)(,c), (eta)(,c) (--->) (eta)(pi)('+)(pi)('-). The product branching ratio B((psi) (--->) (gamma)(eta)(,c)) B((eta)(,c) (--->) (eta)(pi)('+)(pi)('-)) was measured to be 4.2 (+OR-) 0.5 (stat) (+OR-) 0.5 (sys) x 10('-4). Other resonant structure was observed in the (eta)(pi)('+)(pi)('-) spectrum in the range 1 ) (delta)('(+OR-))(pi)('(-OR+)), (delta)('(+OR-)) (--->) (eta)(pi)('(+OR-)). A spin-parity analysis was performed to determine the quantum numbers of the resonances responsible for this structure. However, the result was seen to be model dependent, so that it was not possible to conclusively resolve the underlying structure in the spectrum. No evidence was seen for the decay (iota) (--->) (eta)(pi)('+)(pi)('-). An upper limit was set for the ratio of branching ratios for (iota) (--->) (eta)(pi)(pi) relative to (iota) (--->) KK(pi), R = (B((psi)(--->) (gamma)(iota)) B((iota)(--->) (eta)(pi)(pi)))/(B((psi)(--->) (gamma)(iota)) B((iota)(--->) KK(pi))) < 0.2 (90% C.L.).
Issue Date:1984
Description:140 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1984.
Other Identifier(s):(UMI)AAI8502070
Date Available in IDEALS:2015-05-13
Date Deposited:1984

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