Proposal to study pi- p --> pi0n and pi- p --> eta n at high energy Page: 5 of 37
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dependence at low energies, to a flattening-off and subsequently an actual
increase with rising energy.
The reactions to be measured in this experiment are dominated by a single
n p + non (p exchange)
W P + non (A2 exchange)
They therefore represent an excellent place to study Regge theory as the energy
of the process is increased. The highest energy measurements at present have
only been made at 18 GeV. ' The qualitative features of the data are a
relatively sharp forward peak and a dip at Itl ti 0.6 (GeV/c)2 for n-p + non.
Will this behavior continue at higher energies? The dip is interpreted as resul-
ting from the Regge trajectory a (t) going through zero near -t .6. The
n-p - n'n cross section has been the classic example for Regge theory. Excellent
fits have been obtained from 2 GeV to 18 GeV. Originally pure p exchange was
tried and the complications of cuts in the angular momentum plane were ignored.
However, the appearance of a small amount of polarization requires the presence
of some other trajectory or cuts. Nevertheless, the fit to this reaction over
such a wide energy range suggests this reaction as one to test the predictions
of the Regge pole model as the energy is increased. Similar remarks can be
made about the itp -+ nn cross section. Here the data has been fit by means
of pure A2 exchange. Again, the comparison of these fits at higher energy to
actual measurements will provide an interesting test of Regge theory.
These two reactions in combination can be used to test certain predictions
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Tollestrup, A.V.; Walker, R.L. & /Caltech. Proposal to study pi- p --> pi0n and pi- p --> eta n at high energy, report, June 1, 1970; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc887653/m1/5/: accessed January 18, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.