OBSERVATION OF THE {eta}{sub c} (2980) PRODUCED IN THE RADIATIVE DECAY OF THE {psi}' (3684) Page: 4 of 12
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The lowest lying pseudoscalar bound state of the charmed quark and anti-
quark, the nc, has been the object of considerable search ever since the
discovery of the corresponding vector state, the $(3095). If one assumes
the qc to be lighter than the $, the processes in which one might expect to
observe it are,
c - c (la)
where * denotes the $(3684).
Early observations by the DASP group of a 2r peak at a mass of 283
GeV/c in the decay mode * -. 3r have not been confirmed in the more recent
work of the Crystal Ball Collaboration. The latter group has however reported
the observation of peaks in the study of the *' and * inclusive photon spectra, 3
which they ascribe to the production via reaction (1) of a possible nc of mass
2978 9 MeV/c2
In this paper, we present evidence, based on a high-statistics study of
$ decays with the Mark II detector at SPEAR, for the production through (lb)
of a state of mass 2980 MeV/c which decays into several identified hadronic
final states This work provides confirmation by an independent technique
of the existence of the 2980 MeV/c state.
The Mark II detector has been described in detail in earlier publications'
and we confine ourselves here to a brief discussion of those features crucial
to the present analysis, A cylindrical drift chamber system in a magnetic
field is used to measure the momenta of charged particles. Photons are detected
by a liquid argon calorimeter which provides precise direction information
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Himel, T. M.; Trilling, G. H.; Abrams, G. S.; Alam, M. S.; Blocker, C. A.; Blondel, A. P. et al. OBSERVATION OF THE {eta}{sub c} (2980) PRODUCED IN THE RADIATIVE DECAY OF THE {psi}' (3684), article, July 1, 1980; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc845708/m1/4/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.