Study of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>ω</mi></math></span> production near threshold in the reaction <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow><mi>p</mi><mo>→</mo><mi>ω</mi><mi></mi><mi>n</mi></math></span>

J. Keyne; D. M. Binnie; J. Carr; N. C. Debenham; A. Duane; D. A. Garbutt; W. G. Jones; I. Siotis; J. G. McEwen

doi:10.1103/PhysRevD.14.28

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Study of $ω$ production near threshold in the reaction $π^{-} p \to ω n$

J. Keyne, D. M. Binnie, J. Carr, N. C. Debenham, A. Duane, D. A. Garbutt, W. G. Jones, and I. Siotis

J. G. McEwen

Department of Physics, Imperial College, London, United Kingdom

Department of Physics, Southampton University, Southampton, United Kingdom

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Phys. Rev. D 14, 28 – Published 1 July, 1976

DOI: https://doi.org/10.1103/PhysRevD.14.28

Abstract

We have investigated $ω$ production in the reaction $π^{-} p \to ω n$ very close to threshold. The dependence of the mass, width, branching ratio, and cross section upon the final-state c.m. momentum, $P^{*}$ , were studied. The mass and width were independent of $P^{*}$ with values of 782.4 ± 0.5 and 10.22 ± 0.43 MeV, respectively. The branching ratio $\frac{Γ (ω \to π^{0} γ)}{Γ (ω \to π^{+} π^{-} π^{0})}$ was also constant, having a value of 0.084 ± 0.013. An upper limit of 0.18 was set on the branching ratio $\frac{Γ (ω \to π^{0} π^{0} γ)}{Γ (ω \to π^{0} γ)}$ . We observed a rapid fall in the cross section below $P^{*} = 100$ MeV/c. This could not be explained in terms of $S$ -wave production alone, but could be fitted by a resonant $P$ wave plus a noninterfering $S$ wave.

References (26)

D. M. Binnie et al., Phys. Rev. D 8, 2789 (1973)
N. R. Stanton, Ohio State Univ. Report No. C00-1545-92, 1971 (unpublished)
D. G. Crabb, J. G. McEwen, E. G. Auld, and A. Langsford, Nucl. Instrum. Meth., 48, 87 (1967)
M. A. Abolins et al., paper presented to the International Conference on High Energy Physics, Heidelberg, 1967 (unpublished) J. S. Danburg et al., Phys. Rev. D 2, 2564 (1970)
R. Kraemer et al., Phys. Rev. 136, 496 (1964)
E. P. Wigner, Phys. Rev. 73, 1002 (1948)
Particle Data Group, Phys. Lett. 50B, 1 (1974)
C. Baltay, J. C. Severiens, N. Yeh, and D. Zanello, Phys. Rev. Lett. 18, 93 (1967)
R. Bizzari et al., Nucl. Phys. B14, 169 (1969)
H. W. Atherton et al., Nucl. Phys. B18, 221 (1970)
R. Bizzari et al. Nucl. Phys. 827, 140 (1971)
D. G. Coyne, W. R. Butler, G. Fang-Landau, and J. MacNaughton, Nucl. Phys. B32, 333 (1971)
M. Aguilar-Benitez, S. U. Chung, R. L. Eisner, and N. P. Samios, Phys. Rev. D 6, 29 (1972)
D. Benaksas et al. Phys. Lett. 42B, 507 (1972) ibid.42B, 511 (1972)
R. M. Brown et al. Phys. Lett. 42B, 117 (1972)
M. Roos and J. Rousku, Helsinki Univ. Report No. ISBN 951-45-0326-0, 1974 (unpublished)
A. Duane et al. Phys. Rev. Lett. 32, 425 (1974)
W. D. Apel et al. Phys. Lett. 41B, 234 (1972)
V. V. Barmin et al. Zh. Eksp. Teor. Fiz. 45, 1879 (1963) [Sov. Phys.—JETP 18, 1289 (1964)]
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Omitted endnote
J. M. Blatt and V. F. Weisskopf, Theoretical Nuclear Physics (Wiley, New York, 1956)
R. J. Cashmore, A. J. G. Hey, and P. J. Litchfield, Nucl. Phys. B98, 237 (1975)
A. Brandstetter, S. M. Deen, and P. J. Litchfield, Rutherford Laboratory Report No. RHEL/R 224, 1971 (unpublished)

[c1] D. M. Binnie et al., Phys. Rev. D 8, 2789 (1973)

[c2] N. R. Stanton, Ohio State Univ. Report No. C00-1545-92, 1971 (unpublished)

[c3] D. G. Crabb, J. G. McEwen, E. G. Auld, and A. Langsford, Nucl. Instrum. Meth., 48, 87 (1967)

[c4] M. A. Abolins et al., paper presented to the International Conference on High Energy Physics, Heidelberg, 1967 (unpublished) J. S. Danburg et al., Phys. Rev. D 2, 2564 (1970)

[c5] R. Kraemer et al., Phys. Rev. 136, 496 (1964)

[c6] E. P. Wigner, Phys. Rev. 73, 1002 (1948)

[c7] Particle Data Group, Phys. Lett. 50B, 1 (1974)

[c8] C. Baltay, J. C. Severiens, N. Yeh, and D. Zanello, Phys. Rev. Lett. 18, 93 (1967)

[c9] R. Bizzari et al., Nucl. Phys. B14, 169 (1969)

[c10] H. W. Atherton et al., Nucl. Phys. B18, 221 (1970)

[c11] R. Bizzari et al. Nucl. Phys. 827, 140 (1971)

[c12] D. G. Coyne, W. R. Butler, G. Fang-Landau, and J. MacNaughton, Nucl. Phys. B32, 333 (1971)

[c13] M. Aguilar-Benitez, S. U. Chung, R. L. Eisner, and N. P. Samios, Phys. Rev. D 6, 29 (1972)

[c14] D. Benaksas et al. Phys. Lett. 42B, 507 (1972) ibid.42B, 511 (1972)

[c15] R. M. Brown et al. Phys. Lett. 42B, 117 (1972)

[c16] M. Roos and J. Rousku, Helsinki Univ. Report No. ISBN 951-45-0326-0, 1974 (unpublished)

[c17] A. Duane et al. Phys. Rev. Lett. 32, 425 (1974)

[c18] W. D. Apel et al. Phys. Lett. 41B, 234 (1972)

[c19] V. V. Barmin et al. Zh. Eksp. Teor. Fiz. 45, 1879 (1963) [Sov. Phys.—JETP 18, 1289 (1964)]

[c20] A. B. Baldin et al. Yad. Fiz. 13, 758 (1971) [Sov. J. Nucl. Phys. 13, 431 (1971)]

[c21] S. M. Flatté et al. Phys. Rev. 145, 1050 (1966)

[c22] D. V. Bugg, Nucl. Phys. B88, 381 (1975)

[c23] Omitted endnote

[c24] J. M. Blatt and V. F. Weisskopf, Theoretical Nuclear Physics (Wiley, New York, 1956)

[c25] R. J. Cashmore, A. J. G. Hey, and P. J. Litchfield, Nucl. Phys. B98, 237 (1975)

[c26] A. Brandstetter, S. M. Deen, and P. J. Litchfield, Rutherford Laboratory Report No. RHEL/R 224, 1971 (unpublished)

Physical Review D

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Study of $ω$ production near threshold in the reaction $π^{-} p \to ω n$

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Study of ω production near threshold in the reaction π−p→ωn

Abstract

References (26)

Study of $ω$ production near threshold in the reaction $π^{-} p \to ω n$