On quark model relations for hypercharge-exchange reactions

doi:10.1016/0550-3213(78)90317-6

Nuclear Physics B

Volume 140, Issue 1, 24 July 1978, Pages 141-157

https://doi.org/10.1016/0550-3213(78)90317-6 Get rights and content

Abstract

Peripheral two-body reactions of the type K⁻p→M⁰ + Λ, Σ⁰ or Σ⁰ (1385) are considered. Predictions based on the additive quark model and SU(6) baryon wave functions are tested against data on cross sections and polarisations for given momentum transfer. Data obtained in a high statistics experiment at 4.2 GeV/c K⁻ momentum, as well as data from a large variety of other experiments are used. Highly significant violations of these predictions are observed in the data. These violations are shown to occur in a systematic fashion, according to which SU(6) must be relaxed, but the amplitude structure implied by additivity would remain valid. As an application an amplitude analysis for natural parity exchange reactions with M⁰ = π, ϕ and ϱ respectively is performed, which determines a relative phase, which cannot be obtained in a model-independent analysis. Also reactions with M⁰ = δ or B are considered, and some implications for coupling constants are discussed.

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We present the first model independent test of additive quark model (AQM) predictions relating $K^{+} n_{↑} → K^{∗0} p$ and p_↑p→Δ⁺⁺n reactions with polarized initial nucleons. The previously know AQM equalities and the new AQM inequalities are tested at 6 GeV/c in both s- and t-channel helicity to verify their frame independence. The data are close to the predicted AQM equalities and satisfy a stringent cubic inequality. The observed deviations from AQM equalities may reflect non-additive spin effects in hadron recombination.
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⁺: The investigation is supported by the joint research programs of FOM and ZWO.

^★: Now at Stanford Linear Accelerator Center, Stanford, USA.

^★★: Now at Lawrence Berkeley Laboratory, Berkeley, USA

^★★★: Now at Lawrence Berkeley Laboratory, Berkeley, USA.

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On quark model relations for hypercharge-exchange reactions

Abstract

Phys. Reports

Nucl. Phys.

Nucl. Phys.

Phys. Rev. Lett.

Phys. Rev.

Nucl. Phys.

Nucl. Phys.

Phys. Lett.

Nucl. Phys.

Phys. Lett.

Nucl. Phys.

Nucl. Phys.

Phys. Rev.

Phys. Lett.

Ann. Rev. Nucl. Science