Study of the reaction <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>p</mi><mo>+</mo><mi>p</mi><mo>→</mo><mrow><msup><mrow><mi>Δ</mi></mrow><mrow><mo>+</mo><mi></mi><mo>+</mo></mrow></msup></mrow><mn></mn><mo>(</mo><mn>1236</mn><mo>)</mo><mo>+</mo><mrow><msup><mrow><mi>X</mi></mrow><mrow><mn>0</mn></mrow></msup></mrow></math></span> at 205 GeV/<i>c</i>

S. J. Barish; M. Derrick; B. Musgrave; P. Schultz; J. Whitmore; R. Engelmann; T. Kafka; M. Pratap; R. D. Field

doi:10.1103/PhysRevD.12.1260

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Study of the reaction $p + p \to Δ^{+ +} (1236) + X^{0}$ at 205 GeV/c

S. J. Barish^*, M. Derrick^*, B. Musgrave^*, and P. Schultz^*

J. Whitmore^†,‡

R. Engelmann^§, T. Kafka, and M. Pratap^§,∥

R. D. Field

Argonne National Laboratory, Argonne, Illinois 60439

Fermi National Accelerator Laboratory, Batavia, Illinois 60510

State University of New York, Stony Brook, New York 11790

California Institute of Technology, Pasadena, California 91109

^*Work supported by the U. S. Atomic Energy Commission.
^†Present address: Michigan State University, East Lansing, Michigan 48823.
^‡Operated by Universities Research Association, Inc. under contract with the U. S. Atomic Energy Commission.
^§Present address: University of Mons, 7000 Mons, Belgium.
^∥Work supported by the National Science Foundation.

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Phys. Rev. D 12, 1260 – Published 1 September, 1975

DOI: https://doi.org/10.1103/PhysRevD.12.1260

Abstract

We have studied inclusive $Δ^{+ +} (1236)$ production for $| t_{p Δ} | < 1.0$ ${(G e V / c)}^{2}$ in a 50 000 picture exposure of the 30-inch hydrogen bubble chamber to a 205 GeV/c proton beam. The inclusive $Δ^{+ +}$ cross section for one hemisphere in the center-of-mass system is (1.30±0.14) mb. The mean charged multiplicity of the system recoiling off the $Δ^{+ +}$ is in agreement with that for laboratory $π^{-} p$ interactions at the same energy in the center-of-mass frame. The inclusive $Δ^{+ +}$ production is compared to inclusive $Λ^{0}$ and proton production in the same experiment. The connection between $Δ^{+ +}$ production and diffraction is discussed. We find that not all $Δ^{+ +}$ come from the decay of a diffractively-produced state. The $P_{T}^{2}$ distribution for the $Δ^{+ +}$ has a slope of (10.5±0.9) ${(G e V / c)}^{- 2}$ for $P_{T}^{2} ≲ 0.2$ ${(G e V / c)}^{2}$ . This slope, together with the decay angular distribution of the $Δ^{+ +}$ at small momentum transfer, suggests a strong pion-exchange contribution to the inclusive process. We compare the data to the expectation of a triple-Regge model with $ρ$ - and $π$ -exchange contributions.

References (19)

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P. Capiluppi et al., Nucl. Phys. B79, 189 (1974)
F. T. Dao et al., Phys. Rev. Lett. 30, 34 (1973)
S. J. Barish et al., Phys. Rev. D 9, 2689 (1974)
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[S. J. Barish et al., Phys. Rev. D 9, 1171 (1974)] [13]
H. Bialkowska et al., [France-Soviet Union collaboration, paper submitted to the XVII International Conference on High Energy Physics, London, 1974 (unpublished)] [3]
J. P. De Brion et al., Phys. Rev. Lett. 34, 910 (1975)
T. Kasahara and T. Akiba, Prog. Theor. Phys. 51, 1473 (1974)
S. J. Barish et al., Phys. Rev. Lett. 31, 1080 (1973) [1]
J. Whitmore and M. Derrick, Phys. Lett. 50B, 280 (1974)
D. Brick et al., Phys. Rev. Lett. 31, 488 (1973)
M. Derrick et al., Phys. Rev. D 9, 1853 (1974)
P. Schultz et al., paper submitted to the XVII International Conference on High Energy Physics, London, 1974, ANL Report No. ANL/HEP 7428 (unpublished)
E. Gotsman, Phys. Rev. D 9, 1575 (1974)
M. Bishari, Phys. Lett. 38B, 510 (1972)
J. Pumplin, Phys. Rev. D 8, 2249 (1973)
R. D. Field and G. C. Fox, Nucl. Phys. B80, 367 (1974)
Omitted endnote

[c1] J. Whitmore, Phys. Rep. 10C, 273 (1974) A. N. Diddens, in Proceedings of the XVII International Conference on High Energy Physics, London, 1974, edited by J. R. Smith (Rutherford Laboratory, Chilton, Didcot, Berkshire, England, 1974), p. 1-41

[c2] P. Capiluppi et al., Nucl. Phys. B79, 189 (1974)

[c3] F. T. Dao et al., Phys. Rev. Lett. 30, 34 (1973)

[c4] S. J. Barish et al., Phys. Rev. D 9, 2689 (1974)

[c5] G. Charlton et al., Phys. Rev. Lett. 30, 574 (1973) K. Jaeger et al., Phys. Rev. D 11, 2405 (1975)

[c6] [S. J. Barish et al., Phys. Rev. D 9, 1171 (1974)] [13]

[c7] H. Bialkowska et al., [France-Soviet Union collaboration, paper submitted to the XVII International Conference on High Energy Physics, London, 1974 (unpublished)] [3]

[c8] J. P. De Brion et al., Phys. Rev. Lett. 34, 910 (1975)

[c9] T. Kasahara and T. Akiba, Prog. Theor. Phys. 51, 1473 (1974)

[c10] S. J. Barish et al., Phys. Rev. Lett. 31, 1080 (1973) [1]

[c11] J. Whitmore and M. Derrick, Phys. Lett. 50B, 280 (1974)

[c12] D. Brick et al., Phys. Rev. Lett. 31, 488 (1973)

[c13] M. Derrick et al., Phys. Rev. D 9, 1853 (1974)

[c14] P. Schultz et al., paper submitted to the XVII International Conference on High Energy Physics, London, 1974, ANL Report No. ANL/HEP 7428 (unpublished)

[c15] E. Gotsman, Phys. Rev. D 9, 1575 (1974)

[c16] M. Bishari, Phys. Lett. 38B, 510 (1972)

[c17] J. Pumplin, Phys. Rev. D 8, 2249 (1973)

[c18] R. D. Field and G. C. Fox, Nucl. Phys. B80, 367 (1974)

[c19] Omitted endnote

Physical Review D

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Study of the reaction $p + p \to Δ^{+ +} (1236) + X^{0}$ at 205 GeV/c

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Study of the reaction p+p→Δ++(1236)+X0 at 205 GeV/c

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References (19)

Study of the reaction $p + p \to Δ^{+ +} (1236) + X^{0}$ at 205 GeV/c