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Direct decay π0 → e++e−

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Il Nuovo Cimento (1955-1965)

Summary

The direct decay π0 → e++e− is discussed and analyzed as a probe of «pion size».

Riassunto

Si discute e si analizza il decadimento diretto π0 → e++e− quale mezzo per saggiare la «mole del pione».

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References

  1. G. F. Chew, R. Karplus, S. Gasiorowicz andF. Zachariasen:Phys. Rev.,110, 265 (1958);Y. Nambu:Nuovo Cimento,9, 610 (1958);R. Oehme:Phys. Rev.,111, 1430 (1958);M. Goldberger andS. Treiman:Phys. Rev.,110, 1178 (1958);111, 354 (1958);P. Federbush, M. Goldberger andS. Treiman:Phys. Rev.,112, 642 (1958);S. D. Drell andF. Zachariasen:Phys. Rev.,111, 1727 (1958). The notation of this reference is used here.

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  2. Evaluation ofG in a dispersion theoretic study of π0 → γ+γ decay is discussed inM. L. Goldberger andS. B. Treiman:Nuovo Cimento,9, 451 (1958).

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  3. This is a much smaller branching ratio than discussed inP. Lindenfeld, A. Sachs andJ. Steinberger:Phys. Rev.,89, 531 (1953).

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  6. This has been particularly emphasized recently by the work ofP. Federbush, M. L. Goldberger andS. Treiman:Phys. Rev.,112, 642 (1958). See also:J. Bernstein andM. L. Goldberger:Rev. Mod. Phys.,30, 465 (1958);S. D. Drell:VIII Annual International Conference on High-Energy Physics (CERN, 1958, to be published). It has been discussed here that pion structure may be a clue to a better understanding of nucleon structure. The «pion structure» operating in the nucleon structure problem corresponds to pion scattering with emission or absorption of a virtual photon and is different from vertex (1′). A future complete analysis of (1′) would relate its structure to «fundamental» ones such as the nucleon structure probed by virtual Compton scattering (4).

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Authors and Affiliations

  1. CERN, Geneva

    S. D. Drell

  2. Stanford University, Stanford, Cal.

    S. D. Drell

Authors
  1. S. D. Drell
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Additional information

Ford Foundation Fellow on leave from Stanford University, Stanford, California, summer, 1958.

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Drell, S.D. Direct decay π0 → e++e− . Nuovo Cim 11, 693–697 (1959). https://doi.org/10.1007/BF02732327

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  • DOI: https://doi.org/10.1007/BF02732327

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