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  • Access by Xinjiang University

Strong Shrinkage of the Effective Core at High Energy

Kunio Yamamoto*

  • The Enrico Fermi Institute for Nuclear Studies, The University of Chicago, Chicago, Illinois

  • *On leave of absence from The Department of Physics, Osaka University, Osaka, Japan.

Phys. Rev. 134, B682 – Published 11 May, 1964

DOI: https://doi.org/10.1103/PhysRev.134.B682

Abstract

On the basis of analyticity alone it is shown that in the high-energy limit the partial-wave amplitude al(s) for l>const.ln2s do not contribute substantially to the scattering amplitude for finite angles. For an angle depending upon s this result can be extended to show that the contribution to the scattering amplitude T[s, cosθ(s)] from al(s) for l>const.ln2ssinθ(s) is smaller than any power of s. Here s and θ are the square of the energy and the scattering angle in the center-of-mass system. Classically, this means that a bombarding particle whose impact parameter is larger than the shrinking quantity const.ln2ss12sinθ(s) cannot be appreciably scattered through an angle θ(s). It is necessary to use the unitarity condition only when this result is used to put an upper bound on T[s, cosθ(s)]. Here T(s, cosθ) is assumed to be analytic as a function of cosθ in an s-independent complex neighborhood of the real segment (-1, 1) except for its intersection with the cuts from to x(s) and from x(s) to , x(s) being an arbitrary function with x(s)>1. Finally the forward and backward peaks are discussed and it is proved that the right- (left-) hand cut contributes only to the forward (backward) peak and not to the backward (forward) peak.

References (9)

  1. T. Kinoshita, J. J. Loeffel, and A. Martin, Phys. Rev. Letters 10, 460 (1963)
  2. Omitted endnote

  3. O. W. Greenberg and F. E. Low, Phys. Rev. 124, 2047 (1961)
  4. Omitted endnote

  5. Omitted endnote

  6. K. Yamamoto, Nuovo Cimento 27, 1277 (1963)
  7. J. E. Littlewood, Theory of Functions (Oxford University Press, London, 1944), p. 113] T. Kinoshita, Lecture Note at the Internationale Universitätswoche für Kernphysik at Schladming, Austria, 1963 (unpublished)
  8. M. Froissart, Phys. Rev. 123, 1053 (1961)
  9. Omitted endnote

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