Forward low-mass enhancement in <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>p</mi><mrow><mrow><mover><mrow><mi>p</mi></mrow><mrow><mi>¯</mi></mrow></mover></mrow></mrow></math> seen in reactions in <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>d</mi><mo>→</mo><mo>(</mo><mrow><msub><mrow><mi>n</mi></mrow><mrow><mi>s</mi></mrow></msub></mrow><mo>)</mo><mi>p</mi><mrow><mrow><mover><mrow><mi>p</mi></mrow><mrow><mi>¯</mi></mrow></mover></mrow></mrow><mi>n</mi></math> and <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>d</mi><mo>→</mo><mo>(</mo><mrow><msub><mrow><mi>p</mi></mrow><mrow><mi>s</mi></mrow></msub></mrow><mo>)</mo><mi>p</mi><mrow><mrow><mover><mrow><mi>p</mi></mrow><mrow><mi>¯</mi></mrow></mover></mrow></mrow><mrow><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow></math>

A. E. Kreymer; P. Bonamy; B. Brabson; H. Paik; N. Baggett; C. Baglin; E. C. Fowler; D. Hood; T. Fieguth; M. S. Alam; S. E. Jones; J. S. Poucher; A. H. Rogers; S. Stone

doi:10.1103/PhysRevD.22.36

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Forward low-mass enhancement in $p \bar{p}$ seen in reactions in $π^{-} d \to (n_{s}) p \bar{p} n$ and $π^{-} d \to (p_{s}) p \bar{p} π^{-}$

A. E. Kreymer^*, P. Bonamy^†, B. Brabson, and H. Paik^‡

N. Baggett^§, C. Baglin^∥, E. C. Fowler, and D. Hood^¶

T. Fieguth

M. S. Alam, S. E. Jones^**, J. S. Poucher, A. H. Rogers^††, and S. Stone^‡‡

Indiana University, Bloomington, Indiana 47405

Purdue University, Lafayette, Indiana 47905

Stanford Linear Accelerator Center, Stanford, California 94305

Vanderbilt University, Nashville, Tennessee 37235

^*Present address: P. O. Box 500, Fermilab, Batavia, Illinois 60510.
^†On leave of absence from C.E.N. Saclay, B. P. No. 2, F-91190, Gif-sur-Yvette, France.
^‡Present address: IUPUI, Indianapolis, IN 46205.
^§Present address: D.O.E. High Energy Physics, Washington, D. C. 20545.
^∥On leave of absence from Laboratoire d'Annecy-le-Vieux, B.P. 909, F-74019, Annecy-le-Vieux, France.
^¶Present address: David Lipscomb College, Nashville, TN 37203.
^**Present address: E.G.&G., Idaho Falls, Idaho 83401.
^††Present address: SLAC, Stanford, CA 94305.
^‡‡Present address: Newman Laboratory, Cornell University, Ithaca, N. Y. 14853.

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Phys. Rev. D 22, 36 – Published 1 July, 1980

DOI: https://doi.org/10.1103/PhysRevD.22.36

Abstract

A study of $π^{-} d$ interactions at 13.2 GeV/c has been performed using the SLAC 2-m streamer chamber with a forward-proton trigger/spectrometer. In this paper, we discuss baryon-antibaryon final states where a forward produced $p \bar{p}$ enhancement is seen near 2.1 GeV in both $p \bar{p} n$ and $p \bar{p} π^{-} n$ final states. The measured cross section for $π^{-} d \to (n_{s}) p \bar{p} n$ is 7.6±1.3 μb and for $π^{-} d \to (p_{s}) p \bar{p} π^{-} n$ is 6.6±1.1 μb in this experiment.

References (9)

M. S. Alam et al., Phys. Rev. Lett. 40, 1685 (1978)
A. A. Carter et al., Phys. Lett. 67B, 117 (1977)
A. Donnachie and P. R. Thomas, Nuovo Cimento 26A, 317 (1975)
B. Hyams et al., Nucl. Phys. B73, 202 (1974)
A. E. Kreymer, Ph.D. thesis, Indiana University, 1979, Report No. IUHEE 30 (unpublished D. W. Hood, Ph.D. thesis, Purdue University, 1978 (unpublished)
S. E. Jones, Ph.D. thesis Vanderbilt University, 1978 (unpublished), p. 101
R. S. Dulude and J. A. Gaidos, Nucl. Phys. B91, 77 (1975)
R. L. Jaffe, Univ. of Oxford, Report No. 16/79 (unpublished)
G. Grayer et al., Phys. Lett. 39B, 563 (1972) M. Rozanska et al., Nucl. Phys. B162, 505 (1980)

[c1] M. S. Alam et al., Phys. Rev. Lett. 40, 1685 (1978)

[c2] A. A. Carter et al., Phys. Lett. 67B, 117 (1977)

[c3] A. Donnachie and P. R. Thomas, Nuovo Cimento 26A, 317 (1975)

[c4] B. Hyams et al., Nucl. Phys. B73, 202 (1974)

[c5] A. E. Kreymer, Ph.D. thesis, Indiana University, 1979, Report No. IUHEE 30 (unpublished D. W. Hood, Ph.D. thesis, Purdue University, 1978 (unpublished)

[c6] S. E. Jones, Ph.D. thesis Vanderbilt University, 1978 (unpublished), p. 101

[c7] R. S. Dulude and J. A. Gaidos, Nucl. Phys. B91, 77 (1975)

[c8] R. L. Jaffe, Univ. of Oxford, Report No. 16/79 (unpublished)

[c9] G. Grayer et al., Phys. Lett. 39B, 563 (1972) M. Rozanska et al., Nucl. Phys. B162, 505 (1980)

Physical Review D

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Forward low-mass enhancement in $p \bar{p}$ seen in reactions in $π^{-} d \to (n_{s}) p \bar{p} n$ and $π^{-} d \to (p_{s}) p \bar{p} π^{-}$

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Forward low-mass enhancement in pp¯ seen in reactions in π−d→(ns)pp¯n and π−d→(ps)pp¯π−

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Forward low-mass enhancement in $p \bar{p}$ seen in reactions in $π^{-} d \to (n_{s}) p \bar{p} n$ and $π^{-} d \to (p_{s}) p \bar{p} π^{-}$