Probing the strange nature of the nucleon with phi photoproduction

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The presence inside the nucleon of a significant component of strange-antistrange quark pairs has been invoked to explain a number of current puzzles in the low energy realm of QCD. The {sigma} term in {pi}N scattering is a venerable conundrum which can be explained with a 10%--20% admixture. The spin crisis brought on by the EMC result and follow on experiments was first interpreted as requiring a large strange content of s quarks whose spin helped cancel the contribution of the u and d quarks to the nucleon spin, again of order 10%. Excess phi meson production in p{anti p} ... continued below

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14 p.

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Lowry, M.M. March 6, 1997.

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  • Lowry, M.M. Brookhaven National Lab., Upton, NY (United States). Physics Dept.

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Description

The presence inside the nucleon of a significant component of strange-antistrange quark pairs has been invoked to explain a number of current puzzles in the low energy realm of QCD. The {sigma} term in {pi}N scattering is a venerable conundrum which can be explained with a 10%--20% admixture. The spin crisis brought on by the EMC result and follow on experiments was first interpreted as requiring a large strange content of s quarks whose spin helped cancel the contribution of the u and d quarks to the nucleon spin, again of order 10%. Excess phi meson production in p{anti p} annihilation at LEAR has also been explained in terms of up to a 19% admixture of s{anti s} pairs. Charm production in deep-inelastic neutrino scattering would appear to provide evidence for a 3% strange sea. It is clear that a definite probe of the strange quark content would be an invaluable tool in unraveling a number of mysteries. The longitudinal beam target asymmetry in {psi} photoproduction is a particularly sensitive probe of that content. It is explored here.

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14 p.

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INIS; OSTI as DE97004186

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  • Other Information: PBD: 6 Mar 1997

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  • Other: DE97004186
  • Report No.: BNL--64156
  • Grant Number: AC02-76CH00016
  • DOI: 10.2172/459447 | External Link
  • Office of Scientific & Technical Information Report Number: 459447
  • Archival Resource Key: ark:/67531/metadc676394

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  • March 6, 1997

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  • July 25, 2015, 2:21 a.m.

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  • Nov. 9, 2015, 8:24 p.m.

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Lowry, M.M. Probing the strange nature of the nucleon with phi photoproduction, report, March 6, 1997; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc676394/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.