Two-photon physics Page: 7 of 30
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7
Table II
Theory Experiment
r( 0+yy) 7.6 eV 7.95 eV
E(rlyy) 395 eV 324 eV
r(n'+yy) 6.0 KeV 5.9 KeV
This dramatic agreement seems hard to justify as the use of
current algebra for such heavy states as n and n' is
suspect, especially when complicated by the "U(1) problem".
B. f,f ,A2,E,...: Predictions for the other light quark
states are less firmly based and a variety of theoretical
models have been used. Early models involved either
vector-tensor dominance'1 or FESR and duality'5. The
nonrelativistic quark model has been developed for these
states and applied to these reactions". An alternative
model based on S-matrix unitarization'7 has also been
submitted to this conference.
Krasemann and Vermaseren'6 make an extensive analysis
of resonance production observed via the 1T+T- final state
based on the quark model. They obtain a 2y width of 2-P4 KeV
and a helicity two dominance in the production. They also
find a helicity one component due to virtual photons. Their
results are in rough agreement with earlier quark model
results and with the FESR predictions which obtain somewhat
larger widths. The observation of the Tr+- angular
distributions and the Q2 dependence in virtual production
provide an important test of these models.
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Bardeen, W.A. Two-photon physics, article, October 1, 1981; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1055419/m1/7/?rotate=270: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.