By P. Blanchard, D. Giulini, E. Joos, C. Kiefer, I.-O. Stamatescu

Decoherence is a quantum-mechanical method that dynamically describes the obvious lack of quantum coherence as a result of coupling of the process un- der remark to different levels of freedom, which get away direct commentary. average examples are given by way of scattering tactics, during which the off-scattered debris (and/or radiation) are usually not detected. In such procedures quantum correlations among the saw process and its atmosphere turn into delo- calized in an successfully irreversible demeanour. Such quantum correlations can neither be obvious by means of observations on one or the opposite method on my own, nor inter- preted as statistical correlations among latest (i.e., outlined, yet in all likelihood unknown) states of neighborhood structures. they honestly replicate the non-local nature of quantum mechanics.

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1965 ) us ed a, similar meth d the Cornell 2 GeV n o measure prot on Compton scatte ruing from 450 too 1 350 MeV near 90' ln -mass system. the center-of-m With two exce p tisons a combinati on of these tech c ruques ' has been used in th e reported measurements me of Com ompton scattering. Thee dis isadvantage in using usin the recoil prot on is at measurementn s cannot be m made at very small momentum 2. 197la 1971b 1972 1972 1972 1972 1973 1974 1975 1977 lent quanta t d b 1-cm MIT Univ. of Chicag MIT Univ.

Y( ~ l g.. 7 hadronic photoabsorp sor tion i cross sections an hadron-hadron n cr cross sections suggests, ests in the region below 30 GeV before ore the cross sec t xon begins to rise r a arametrization of the p o on tion as the sum of Regg e--p ole th t h l exc h ang nel. In the h xg h--e nergy limit this correspon s ", - ""-p-. ". - — lauber correction, G and the ( 1 —P ) . 4) rjkman (1976) argue that the West corFrankfurt and Strikman rection is incorrec orrect and actually vanisishes.

I FIG. 50. A plot of the hydrogen and deuterium cross sections obtained by Criegee et al. (1977) at 5 and 6 GeV (from Criegee eg ag. , 1977a). Rev. Mod. Phys. , Vol. 50, No. 10) t (GeY ) FIG. 51. A plot versus momentum transfer of the Compton cross section for hydrogen and deuterium obtained by the SLAG group (after Boyarski et al. 971). 302 Bauer, Spital, Yennie, and Pipkin: Hadronic properties of the photon TABLE VI. Tabulation of the determination of the isospin-0 and isospin-1 components by Criegee et al.

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