BACKWARD K~;;p ELASTIC SCATTERING AND 0 PRODUCTION

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A high precision measurement of the momentum dependence of backward {sup -}p elastic scattering from 476 to 1077 MeV/c incident momentum has been performed at the Brookhaven National Laboratory Alternating Gradient Synchrotron. With the same apparatus they have also measured the 0{sup o} production of pions in the reaction K{sup -}p {yields} {Sigma}{sup -}{pi}{sup +}. The forward and backward angular distributions decomposed into partial waves are particularly simple since the Legendre polynomials are either {+-}1, and the spin-flip amplitude is absent. The forward elastic cross section is well determined through the total cross section using the optical theorem and dispersion ... continued below

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Alston-Garnjost, M.; Hamilton, R.; Kenny, R.; Nicholson, H.; Lazarus, D.; Pollard, D. et al. August 1, 1978.

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A high precision measurement of the momentum dependence of backward {sup -}p elastic scattering from 476 to 1077 MeV/c incident momentum has been performed at the Brookhaven National Laboratory Alternating Gradient Synchrotron. With the same apparatus they have also measured the 0{sup o} production of pions in the reaction K{sup -}p {yields} {Sigma}{sup -}{pi}{sup +}. The forward and backward angular distributions decomposed into partial waves are particularly simple since the Legendre polynomials are either {+-}1, and the spin-flip amplitude is absent. The forward elastic cross section is well determined through the total cross section using the optical theorem and dispersion relations. The backward elastic cross section has been found by bubble chamber experiments to quite small, generally an order of magnitude smaller than the forward cross section. This is easily understood; the many absorption channels present make the amplitudes largely imaginary so that even and odd parity states cancel in their contributions to backward scattering. For this reason a small resonant amplitude will be expected to reveal itself most prominently in the backward direction. If a resonance has too small an elasticity to be seen in the elastic channel, but has a large branching fraction into {Sigma}{pi} then it should be observed at 0{sup o} in this reaction.

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  • 19th International conference on High Energy Physics , Tokyo, Japan, August 23-31, 1978

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  • Report No.: LBL-7985
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 1014060
  • Archival Resource Key: ark:/67531/metadc846787

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • August 1, 1978

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

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  • June 15, 2016, 6:45 p.m.

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Alston-Garnjost, M.; Hamilton, R.; Kenny, R.; Nicholson, H.; Lazarus, D.; Pollard, D. et al. BACKWARD K~;;p ELASTIC SCATTERING AND 0 PRODUCTION, article, August 1, 1978; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc846787/: accessed October 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.