Analysis of the <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi>N</mi></mrow><mrow><mo>*</mo></mrow></msup></mrow><mn></mn><mo>(</mo><mn>1500</mn><mo>)</mo><mn></mn></math></span> and <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi>N</mi></mrow><mrow><mo>*</mo></mrow></msup></mrow><mn></mn><mo>(</mo><mn>1700</mn><mo>)</mo><mn></mn></math></span> Baryon Resonances Produced via Diffraction Dissociation

R. Morse; B. Y. Oh; W. D. Walker; J. T. Carroll; J. T. Lynch; W. Robertson; T. F. Johnston; J. A. J. Mathews; J. D. Prentice; T. S. Yoon

doi:10.1103/PhysRevD.4.133

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Analysis of the $N^{} (1500)$ and $N^{} (1700)$ Baryon Resonances Produced via Diffraction Dissociation

R. Morse^*, B. Y. Oh^†, W. D. Walker, J. T. Carroll, J. T. Lynch, and W. Robertson

T. F. Johnston, J. A. J. Mathews, J. D. Prentice, and T. S. Yoon

University of Wisconsin, Madison, Wisconsin 53706

University of Toronto, Toronto, Ontario, Canada

^*Present address: Physics Department, University of Colorado, Boulder, Colorado 80302.
^†Present address: Physics Department, Michigan State University, East Lansing, Michigan.

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Phys. Rev. D 4, 133 – Published 1 July, 1971

DOI: https://doi.org/10.1103/PhysRevD.4.133

Abstract

We report on evidence in the $π π N$ mass spectrum for the production of two nucleon isobars, the $N^{*} (1500)$ and $N^{*} (1700)$ . They appear to be produced very peripherally, and have the same production cross section at both 7.0 and 25.0 $\frac{GeV}{c}$ , indicating that a nuclear diffraction-dissociation process is dominant. The $N^{*} (1500)$ seems to be $J^{P} = {\frac{1}{2}}^{+}$ and decays principally via $p σ$ and not $Δ^{+ +} π^{-}$ as previously suggested. The $N^{*} (1700)$ could be the $N^{*} (1688) {\frac{5}{2}}^{+}$ decaying partially into $Δ^{+ +} π^{-}$ , or it could be the $N^{*} (1700) {\frac{1}{2}}^{-}$ decaying in a non- $Δ^{+ +} π^{-}$ mode riding on a large $Δ^{+ +} π^{-} {\frac{5}{2}}^{+}$ nonresonant Deck-type background. Finally the $Λ K$ decay of the $N^{*} (1700)$ is observed and evidence presented for it being a $J = \frac{1}{2}$ object. Production of this $½^{-}$ isobar should be forbidden by the Morrison $Δ P = {(- 1)}^{Δ J}$ rule.

References (22)

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G. Belletini et al., Phys. Letters 18, 167 (1965) C. Ankenbrandt et al., Nuovo Cimento 35, 1052 (1965) E. W. Anderson et al., Phys. Rev. Letters 16, 855 (1966) K. J. Foley et al., 19, 397 (1967)
R. T. Deck, Phys. Rev. Letters 13, 169 (1964) M. H. Ross et al., 19, 546 (1967)
E. Gellert et al., Phys. Rev. Letters 17, 884 (1966)
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David J. Crennell et al., Phys. Rev. Letters 19, 1212 (1967)
L. Stodolsky, Phys. Rev. Letters 18, 973 (1967)
D. R. O. Morrison, Phys. Rev. 165, 1699 (1968)
Omitted endnote
Omitted endnote
Omitted endnote
P. Antich et al., Phys. Rev. Letters 22, 39 (1969)
V. E. Barnes et al., Phys. Rev. Letters 23, 1516 (1969)
R. Ehrlich et al., Phys. Rev. Letters 21, 1839 (1968)
R. A. Jespersen et al., Phys. Rev. Letters 21, 1368 (1968)
Omitted endnote
S. M. Berman and M. Jacob, Phys. Rev. 139, B1023 (1965)
J. Rhode et al., Phys. Rev. 187, 1844 (1969)
M. Jacob and G. C. Wick, Ann. Phys. (N.Y.) 7, 404 (1959)
[18] [18]
[6]
Omitted endnote

[c1] R. Ehrlich et al., Phys. Rev. Letters 21, 1839 (1968) J. G. Rushbrooke in Proceedings of the Fourteenth International Conference on High-Energy Physics, Vienna, 1968, edited by J. Prentki and J. Steinberger (CERN, Geneva, Switzerland, 1968) V. E. Barnes et al., Phys. Rev. Letters 23, 1516 (1969) R. A. Jespersen et al., 21, 1368 (1968) P. Antich et al., 22, 39 (1969)

[c2] G. Belletini et al., Phys. Letters 18, 167 (1965) C. Ankenbrandt et al., Nuovo Cimento 35, 1052 (1965) E. W. Anderson et al., Phys. Rev. Letters 16, 855 (1966) K. J. Foley et al., 19, 397 (1967)

[c3] R. T. Deck, Phys. Rev. Letters 13, 169 (1964) M. H. Ross et al., 19, 546 (1967)

[c4] E. Gellert et al., Phys. Rev. Letters 17, 884 (1966)

[c5] J. G. Rushbrooke in Phys. Rev. 177, 2357 (1969)

[c6] David J. Crennell et al., Phys. Rev. Letters 19, 1212 (1967)

[c7] L. Stodolsky, Phys. Rev. Letters 18, 973 (1967)

[c8] D. R. O. Morrison, Phys. Rev. 165, 1699 (1968)

[c9] Omitted endnote

[c10] Omitted endnote

[c11] Omitted endnote

[c12] P. Antich et al., Phys. Rev. Letters 22, 39 (1969)

[c13] V. E. Barnes et al., Phys. Rev. Letters 23, 1516 (1969)

[c14] R. Ehrlich et al., Phys. Rev. Letters 21, 1839 (1968)

[c15] R. A. Jespersen et al., Phys. Rev. Letters 21, 1368 (1968)

[c16] Omitted endnote

[c17] S. M. Berman and M. Jacob, Phys. Rev. 139, B1023 (1965)

[c18] J. Rhode et al., Phys. Rev. 187, 1844 (1969)

[c19] M. Jacob and G. C. Wick, Ann. Phys. (N.Y.) 7, 404 (1959)

[c20] [18] [18]

[c21] [6]

[c22] Omitted endnote

Physical Review D

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Analysis of the $N^{} (1500)$ and $N^{} (1700)$ Baryon Resonances Produced via Diffraction Dissociation

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Analysis of the N*(1500) and N*(1700) Baryon Resonances Produced via Diffraction Dissociation

Abstract

References (22)

Analysis of the $N^{} (1500)$ and $N^{} (1700)$ Baryon Resonances Produced via Diffraction Dissociation