Asymmetric Electron Pair Production on Carbon

R. M. Simonds; B. Richter

doi:10.1103/PhysRevD.2.417

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Asymmetric Electron Pair Production on Carbon

R. M. Simonds^*

B. Richter

High Energy Physics Laboratory, Stanford University, Stanford, California 94305

Stanford Linear Accelerator Center, Stanford, California 94305

^*Present address: Cambridge Electron Accelerator, Cambridge, Mass.

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Phys. Rev. D 2, 417 – Published 1 August, 1970

DOI: https://doi.org/10.1103/PhysRevD.2.417

Abstract

The cross section for the reaction $γ + C \to e^{+} + e^{-} + C$ has been measured for a series of kinematic points giving nuclear momentum transfers in the region 0.2-0.7 $F^{- 2}$ , with incident photon energies in the region for photoproduction of the first two pion-nucleon resonances. Measurements were made, using asymmetric detection geometry, of electron and positron cross sections for each point. The charge-independent yields are shown to be in agreement with predictions of quantum electrodynamics for coherent and quasi-elastic production on carbon. The charge-asymmetric results are shown to be consistent with recent estimates of the interference between Bethe-Heitler and Compton pair production amplitudes with excitation of an intermediate $π - N$ state in the Compton diagram.

References (30)

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[25]

[c1] J. G. Asbury, W. K. Bertram, V. Becker, P. Joos, M. Rhode, and J. S. Smith, Phys. Rev. 161, 1344 (1967) E. Eisenhandler, J. Feigenbaum, N. Mistry, P. Mostek, D. Rust, A. Silverman, C. Sinclair, and R. Talman, Phys. Rev. Letters 18, 425 (1967) R. Weinstein, in Proceedings of the International Symposium on Electron and Proton Interactions, Stanford University, Stanford, Calif., 1967 (unpublished)

[c2] K. J. Cohen, S. Homma, D. Luckey, and L. S. Osborne, Phys. Rev. 173, 1339 (1968)

[c3] S. D. Drell, Ann. Phys. (N. Y.) 4, 75 (1958) J. D. Bjorken, S. D. Drell, and S. C. Frautschi, Phys. Rev. 112, 1409 (1958)

[c4] G. R. Henry, Phys. Rev. 166, 1553 (1968)

[c5] B. Richter, Phys. Rev. Letters 1, 203 (1958)

[c6] S. C. C. Ting, Lecture at the International School of Physics "Ettore Majorana," Erice (Trapani), Sicily, 1967 (unpublished)

[c7] H. Crannell, Phys. Rev. 148, 1107 (1966) ibid.136, B1580 (1964)

[c8] R. B. Neal, Stanford University Microwave Laboratory Report No. 185, 1953 (unpublished)

[c9] W. K. H. Panofsky and J. A. McIntyre, Rev. Sci. Instr. 25, 287 (1954)

[c10] T. Janssens, Ph.D. thesis, Stanford University, 1965 (unpublished) D. Yount and J. Pine, Phys. Rev. 128, 1842 (1962) D. Yount, Nucl. Instr. Methods 52, 1 (1967)

[c11] J. V. Allaby and D. M. Ritson, Rev. Sci. Instr. 36, 607 (1965)

[c12] R. Simonds and B. Richter, Rev. Sci. Instr. 34, 929 (1963)

[c13] W. Heitler, The Quantum Theory of Radiation, 3rd ed. (Oxford U. P., London, 1964)

[c14] R. A. Berg and C. N. Lindner, Phys. Rev. 112, 2072 (1958)

[c15] E. A. Allton, Phys. Rev. 135, B570 (1964)

[c16] L. N. Hand, Phys. Rev. 129, 1834 (1963)

[c17] B. P. Nigam, Phys. Rev. 131, 238 (1963)

[c18] H. A. Bethe and W. Heitler, Proc. Roy. Soc. (London) A146, 83 (1934)

[c19] S. D. Drell and C. L. Schwartz, Phys. Rev. 112, 568 (1958)

[c20] W. L. Faissler, F. M. Pipkin, and K. C. Stanfield, Phys. Rev. Letters 19, 1202 (1967)

[c21] J. M. Hammersley and D. D. Handscomb, Monte Carlo Methods (Wiley, New York, 1964)

[c22] S. J. Brodsky and J. R. Gillespie, Phys. Rev. 173, 1011 (1968)

[c23] R. R. Lewis, Jr., Phys. Rev. 102, 537 (1956)

[c24] S. Minami, Nuovo Cimento 47A, 64 (1967)

[c25] A. J. Dufner and Y. S. Tsai, Phys. Rev. 168, 1801 (1968)

[c26] S. J. Brodsky, A. C. Hearn, and R. Parsons, Phys. Rev. 187, 1899 (1969)

[c27] R. H. Dalitz and D. G. Sutherland, Phys. Rev. 146, 1180 (1966)

[c28] [25] [27]

[c29] N. Barash-Schmidt, A. Barbaro-Galtieri, L. R. Price, A. H. Rosenfeld, P. Söding, C. G. Wohl, M. Roos, and G. Conforto, Rev. Mod. Phys. 41, 109 (1969)

[c30] [25]

Physical Review D

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Asymmetric Electron Pair Production on Carbon

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