Abstract
The composite particle collision problem is evidently of great importance in many fields of quantum physics. In the last eight years or so this problem has been studied with increasing interest, in particular for the case of three nonrelativistic elementary particles, i.e., for the scattering of an elementary particle by a two-particle bound-state (for instance, a nucleon by a deuteron).
Seminar given at the VIII. Internationalen Universitätswochen für Kernphysik, Schladming, Feb. 24–March 8, 1969.
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References and Footnotes
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L. D. Faddeev, Soviet Phys. Dokl. 6, 384 (1961); 7, 600 (1963).
L. D. Faddeev, Mathematical Aspects of the Three-Body Problem in the Quantum Scattering Theory (Israel Program for Scientific Translation, Jerusalem 1965).
A. N. Mitra, Nucl. Phys. 32, 529 (1962).
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R. Amado, R. D. Amado and Y. Y. Yam, Phys. Rev. 136, B650 (1964); 140, B1291 (1965).
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Compare also: P. E. Shanley and R. Amado, Annals of Physics 44, 363 (1967) where many relevant references are given.
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See also: A. C. Phillips, Phys. Rev. 142, 984 (1966); 145, 733 (1966).
H. Ekstein, Phys. Rev. 101, 880 (1956); Compare also [6] and Section 2 of the reference given in[11].
Uβα can be defined explicitly. Instead of doing this we give in the following the integral equations which it fulfills.
R. Amado, R. D. Amado and B. W. Lee, Phys. Rev. 121, 319 (1961).
The Faddeev-type equations (5.1) were given by E. O. Alt, P. Grassberger and W. Sandhas, Nucl. Phys. B2, 167 (1967).
Compare in this respect the discussion at the end of Section 7, and footnote [17].
Faddeev originally constructed his equations by summing up the subsystem series [1].
K. M. Watson, Phys. Rev. 89, 575 (1953).
R. J. Glauber, in: High Energy Physics and Nuclear Structure, ed.: G. Alexander (North Holland, Amsterdam (1967)).
Instead of more general expressions for the “form factors” can also be used. 16. We apply, in fact, a suitable version of the quasiparticle method developed for the two-body case by S. Weinberg: Phys. Rev. 130, 776 (1963); 131, 440 (1963)
see also K. Meetz, J. Math. Phys. 3, 690 (1962). It should be noted that Weinberg himself proposed an extension of this treatment to the three-(n-)body-case (Phys. Rev. 133, B232 (1964)). However, his very complicated version seems to be beyond any practical applicability.
Faddeev-type equations for transition operators which are different from our Uβα have previously been introduced by Lovelace who proposed many of the discussed ideas. Since his equations, however, contain the Tγ and the potentials Vγ it is even cumbersome to apply the approximation of Section 6. For the performance of the general treatment of Section 7 the replacement of his relations by the equations (5.1) was decisive.
C. Lovelace, in: Strong Interactions and High Energy Physics, ed.: R. G. Moorhouse (Oliver and Boyd, London 1964).
S. Weinberg, Phys. Rev. 131, 440 (1963).
To be precise: this property holds for complex energies. Some mathematical effort is required in going to the real axis.
In the Faddeev equations Tγ GO or is a two-par-tide operator acting in the three-particle space. The above considerations on the Schmidt norms are only valid for genuine two-particle operators. But they lead to similar statements with respect to the operator norms of Tγ GO as read in the three-particle space. Such properties are sufficient for our argumentation.
J. Carew and L. Rosenberg, preprint.
H. Feshbach, Annals of Phys. 5, 357 (1958); 19, 287 (1962).
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Recall that solvable field theoretical models, as, e.g., the Zachariasen model (F. Zachariasen, Phys. Rev. 121, 1851 (1961).
W. Thirring, Nuovo Cimento 23, 1064 (1962)) have usually such a structure.
An equivalent field theoretical (Lee-type) model has been developed by R. D. Amado [4].
The separation (10.3) leads to a splitting of T of the structure (7.1) [16].
P. Grassberger and W. Sandhas, Zeitschr. f. Physik 217, 9 (1968).
Compare the relevant papers cited in [3], [4], [7].
For further references see H. P. Noyes and H. Fieldeldey, in: Three-Particle Scattering in Quantum Mechanics, ed.: J. Gillespie and J. Nuttall (Benjamin, New York 1968).
The details are given in: E. Alt, P. Grassberger and W. Sandhas, Bonn-preprint 2-55 (1969), where also the three-body bound-state problem is studied.
J. S. Ball and D. Y. Wong, Phys. Rev. 169, 1362 (1968) Compare also
T. A. Osborn, SLAC-report 79 (1967).
V. A. Alessandrini, H. Fanchiotti and C. A. Garcia, Phys. Rev. 170, 935 (1968).
Note, that in contrast to the above results, variational calculations usually yield too small values of ΔE. Compare e.g., the discussion of the whole problem in [31], Section V. 1, where further methods and results are reviewed.
Compare the references 2–7 given in [37] and furthermore
R. G. Newton, J. Math. Phys. 8, 851 (1967).
R. Omnes, Phys. Rev. 165, 1265 (1968).
P. Grassberger and W. Sandhas, Nucl. Phys. B2, 181 (1967).
Applying such treatments, it is not necessary to start by first writing integral equations with connected kernels. This is in contrast to claims often made (compare also the discussion of this point in [29] and in Section 9).
More general expressions for the “potential” occur if nonpolar rest terms are retained in the subsystems (compare the generalizations of the treatment of Section 6 given in Section 7).
E. O. Alt, P. Grassberger and W. Sandhas, Bonn-preprint 2-48(1968).
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Sandhas, W. (1969). Composite Particle Collisions in the Non-Relativistic Three-Body Theory. In: Urban, P. (eds) Particle Physics. Acta Physica Austriaca, vol 6/1969. Springer, Vienna. https://doi.org/10.1007/978-3-7091-7638-2_13
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