Pi-lambda phase-shift information from high-energy anti-neutrino reactions and from xi-e-4 decays
19698 pages
Published in:
- Phys.Rev. 178 (1969) 2365-2372
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Abstract: (APS)
Methods are described to obtain the S-wave πΛ phase shift from the processes Ξ→Λπeν¯ and ν¯+N→Λπμ¯. Each of these processes is fully specified (for vanishing lepton mass) by a set of sixteen seven-dimensional distributions describing the intensity and the various polarization spectra. From each distribution, nine functions of a single variable, the invariant πΛ mass, are extracted. Ratios of these functions determine the S-wave phase shift, for energies where only S- and P-wave amplitudes are appreciable and where the S phase shift is the only significant one. For the decays there are 36 independent determinations of this kind. For the reactions there are 8, and these are independent of a detailed knowledge of the incoming ν¯ spectrum. In all instances, knowledge of the polarizations of the parent baryon and of the Λ is indispensable. No assumptions on the structure of hadronic form factors are necessary. We do assume that possible deviations from lepton pair locality and from T invariance are insignificant.- pion-lambda: interaction
- interaction: pion-lambda
- xi: leptonic decay
- leptonic decay: xi
- final state
- lambda: pion: electron: antineutrino
- antineutrino-nucleon: interaction
- interaction: antineutrino-nucleon
- lambda: pion neutral: muon plus
- neutral: final state
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