SEARCH FOR T-VIOLATION IN THE INELASTIC SCATTERING OF ELECTRONSFROM A POLARIZED PROTON TARGET Page: 3 of 17
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anr (T). Ch_ s and Le prpoe , est __f . this hypths involving; the _nlatc
Following heictrovryof ioton inre, c of the mesn, aerntein
eierg nd eeitede out hat) dnte violatios mightiresufrme existen ofon
sctern of electns from i a oarzd proto targe, in_, whc ol te scttre
hadronic states F, for the reaction
e p- e - (1)
where the target proton spin is along (opposite to) the normal to the electron scat-
tering plane:
- = in out (2)
in outi
defined by the momentum vectors of the incident (P ) and scattered (Piout) electron.
Then, in the single-photon-exchange approximation, the asymmetry
A = (3)
o~ +cr
must vanish unless T is violated. (For elastic scattering, A can be shown to
vanish independently of T, Irom current conservation and hermiticity alone.) A
nonzero value of A can also arise from higher-order (a3 ) effects (such as the
interference between one-photon- exchange and two-photon- exchange amplitudes)
without requiring T-violating amplitudes. This contribution should be small,
however, because it involves an additional power of oa. Furthermore this con-
tribution will depend on the sign of the lepton charge and, therefore, will change
sign when the experiment is repeated with a positron beam. A T-violation effect
will have the same sign for electrons or positrons.
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Rock, Stephen; Borghini, Michel; Chamberlain, Owen; Fuzesy,Raymond Z.; Morehouse, Charles C.; Powell, Thomas et al. SEARCH FOR T-VIOLATION IN THE INELASTIC SCATTERING OF ELECTRONSFROM A POLARIZED PROTON TARGET, report, March 1, 1970; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc902501/m1/3/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.