Discrepancy between Soft-Pion Predictions and Experiment in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>NN</mi><mo>→</mo><mi>NN</mi><mi>π</mi></math></span>

M. E. Schillaci; R. R. Silbar

doi:10.1103/PhysRevD.2.1220

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Discrepancy between Soft-Pion Predictions and Experiment in $NN \to NN π$

M. E. Schillaci and R. R. Silbar

University of California, Los Alamos Scientific Laboratory, Los Alamos, New Mexico 87544

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Phys. Rev. D 2, 1220 – Published 1 October, 1970

DOI: https://doi.org/10.1103/PhysRevD.2.1220

Abstract

Sources of a discrepancy between experiment and model-independent soft-pion predictions for the production of low-energy pions in the reaction $pp \to np π^{+}$ at 740 MeV are examined and discussed. These predictions deal only with the leading behavior of the production amplitude. However, higher-order terms, present because $μ \neq 0$ , seem to dominate because of resonance effects. An extended version of the Mandelstam resonance model appears sufficient to explain the experimental data, even for the lowest-energy pions. Ambiguities in pion production at threshold are also discussed.

References (30)

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([13,14])
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([20])
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[c1] D. R. F. Cochran, P. N. Dean, P. A. M. Gram, E. A. Knapp, E. R. Martin, D. E. Nagle, R. B. Perkins, W. J. Schlaer, E. D. Theriot, and H. A. Thiessen (private communication)

[c2] C. T. Grant, M. E. Schillaci, and R. R. Silbar, Phys. Rev. 184, 1737 (1969)

[c3] H. A. Thiessen, Bull. Am. Phys. Soc. 14, 1198 (1969)

[c4] S. L. Adler and R. F. Dashen, Current Algebras (Benjamin, New York, 1968)

[c5] S. J. Lindenbaum and R. H. Sternheimer, Phys. Rev. 105, 1874 (1957)

[c6] S. Mandelstam, Proc. Roy. Soc. (London) A244, 491 (1958)

[c7] S. L. Adler, Phys. Rev. 139, B1638 (1965)

[c8] S. L. Adler and Y. Dothan, Phys. Rev. 151, 1267 (1966)

[c9] F. E. Low, Phys. Rev. 110, 974 (1958)

[c10] E. Nyman, Phys. Rev. 170, 1628 (1968)

[c11] [4], p. 112, Y. Nambu and D. Lurié, Phys. Rev. 125, 1429 (1962) Y. Nambu and E. Shrauner, ibid. 128, 862 (1962) R. Baier and H. Kühnelt, Nuovo Cimento 63, 135 (1969)

[c12] M. L. Goldberger, M. T. Grisaru, S. W. MacDowell, and D. Y. Wong, Phys. Rev. 120, 2250 (1960)

[c13] M. H. MacGregor, R. A. Arndt, and R. M. Wright, Phys. Rev. 169, 1149 (1968) ibid.173, 1272 (1968)

[c14] Z. Janout, Yu. M. Kazarinov, F. Lehar, and A. M. Rozanova, Nucl. Phys. A127, 449 (1969)

[c15] R. P. Haddock, M. Zeller, and K. M. Crowe, UCLA Report No. MPG-64-1P (unpublished)

[c16] E. Heer, W. Hirt, M. Martin, E. G. Michaelis, C. Serre, P. Skarek, and B. T. Wright, in Proceedings of the Conference on Intermediate Energy Physics, 1966 (College of William and Mary, Williamsburg, Va., 1967), p. 277 W. Hirt, thesis, Eidgenosse Technische Hochschule, Zurich, 1968 (unpublished)

[c17] B. Baldoni, S. Focardi, H. Hromadnik, L. Monari, F. Saporetti, S. Feminò, F. Mezzaranes, E. Bertolini, and G. Gialanella, Nuovo Cimento 26, 1376 (1962)

[c18] V. M. Guzhavin, G. K. Kliger, V. Z. Kolganov, A. V. Lebedev, K. S. Marish, Yu. D. Prokoshkin, V. T. Smolyankin, A. P. Sokolov, L. M. Soroko, and T. Wa-Ch'uang, Zh. Eksperim. i Teor. Fiz. 46, 1245 (1964) [Soviet Physics. JETP 19, 847 (1964)]

[c19] M. E. Schillaci, R. R. Silbar, and J. E. Young, Phys. Rev. Letters 21, 711 (1968) ibid.21, 1030(E) (1968) Phys. Rev. 179, 1539 (1969)

[c20] D. S. Beder, Nuovo Cimento 56A, 625 (1968) ibid.58A, 908(E) (1968)

[c21] [19]

[c22] J. E. Young, Ann. Phys. (N. Y.) 56, 391 (1970)

[c23] Omitted endnote

[c24] ([13,14])

[c25] Omitted endnote

[c26] ([6])

[c27] ([20])

[c28] E. Shrauner, Phys. Rev. 131, 1847 (1963)

[c29] M. G. Olsson and G. B. Yodh, Phys. Rev. 145, 1309 (1966)

[c30] L. N. Chang, Phys. Rev. 162, 1497 (1967)

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Discrepancy between Soft-Pion Predictions and Experiment in $NN \to NN π$

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Discrepancy between Soft-Pion Predictions and Experiment in NN→NNπ

Abstract

References (30)

Discrepancy between Soft-Pion Predictions and Experiment in $NN \to NN π$