Experimental evidence for a violation of a quark model prediction at the baryon vertex

E. Hirsch; U. Karshon; H. J. Lipkin; Y. Eisenberg; A. Shapira; G. Yekutieli; J. Goldberg

doi:10.1016/0370-2693(71)90129-8

Experimental evidence for a violation of a quark model prediction at the baryon vertex

E. Hirsch^*, U. Karshon, H. J. Lipkin, Y. Eisenberg, A. Shapira, G. Yekutieli, J. Goldberg

^*Corresponding author for this work

Department of Particle Physics and Astrophysics

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

Abstract

The matrix-elements of the reactions A + N → B + (Λ, Σ, Y^*(1385)) where A and B are hadrons and N is a nucleon, are related by quark model predictions or alternatively by baryon form-factors derived from SU(6) symmetry. Experimental results from various reactions at several energies are presented and found to be in disagreement with the prediction: the Σ and Y^* cross sections are consistently too large compared to the Λ cross section. Detailed analysis of vector-meson production in K^-p and K^-n interactions at 3 GeV/c indicate that the violation is mainly due to the spin-flip contribution at the baryon vertex.

Original language	English
Pages (from-to)	139-143
Number of pages	5
Journal	Physics Letters B
Volume	36
Issue number	2
DOIs	https://doi.org/10.1016/0370-2693(71)90129-8
Publication status	Published - 23 Aug 1971

Funding

We would like to thank the members of the SABRE and APS collaborations at Saclay, Amsterdam, Bologna and Ecole Polytechnique for allowing us to use the K-n and K-p data at 3 GeV/c. In particular we are grateful to Drs. A. Rouge, B. Barloutaud and J. C. Scheuer for helpful comments. We thank Professor R. G. Ammar for sening us information on the 5.5 GeV/c data.

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

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abstract = "The matrix-elements of the reactions A + N → B + (Λ, Σ, Y*(1385)) where A and B are hadrons and N is a nucleon, are related by quark model predictions or alternatively by baryon form-factors derived from SU(6) symmetry. Experimental results from various reactions at several energies are presented and found to be in disagreement with the prediction: the Σ and Y* cross sections are consistently too large compared to the Λ cross section. Detailed analysis of vector-meson production in K-p and K-n interactions at 3 GeV/c indicate that the violation is mainly due to the spin-flip contribution at the baryon vertex.",

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AU - Hirsch, E.

AU - Karshon, U.

AU - Lipkin, H. J.

AU - Eisenberg, Y.

AU - Shapira, A.

AU - Yekutieli, G.

AU - Goldberg, J.

PY - 1971/8/23

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AB - The matrix-elements of the reactions A + N → B + (Λ, Σ, Y*(1385)) where A and B are hadrons and N is a nucleon, are related by quark model predictions or alternatively by baryon form-factors derived from SU(6) symmetry. Experimental results from various reactions at several energies are presented and found to be in disagreement with the prediction: the Σ and Y* cross sections are consistently too large compared to the Λ cross section. Detailed analysis of vector-meson production in K-p and K-n interactions at 3 GeV/c indicate that the violation is mainly due to the spin-flip contribution at the baryon vertex.

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Experimental evidence for a violation of a quark model prediction at the baryon vertex

Abstract

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