Neutral-Boson Photoproduction on Hydrogen at High Energies

Photoproduction cross sections for neutral $π$ , $η$ , $ρ$ , and $φ$ mesons have been measured at the Stanford Linear Accelerator Center for photon energies between 5 and 17.8 GeV, and $t$ (four-momentum transfer squared) between -0.12 and -1.4 ${(G e V / c)}^{2}$ , using a missing-mass technique. The pion production at lower energies is characterized by a fast falloff with increasing $| t |$ at small $| t |$ values, with a dip at $t = - 0.5$ ${(G e V / c)}^{2}$ followed by a secondary maximum around $t = - 0.9$ ${(G e V / c)}^{2}$ and a smooth falloff at larger $| t |$ values. As the incident photon energy increases, the dip becomes less pronounced, in contradiction to the expectations of simple Regge theories based only on the exchange of the $ω$ and $B$ trajectories. $η$ photo-production was measured around 6 GeV and at 9 GeV. The cross section decreases smoothly with $t$ and shows no dip at $t = - 0.5$ ${(G e V / c)}^{2}$ , in disagreement with predictions based on Reggeized $ρ$ exchange. $ρ$ production rates agree well with predictions assuming diffraction production. The differential cross section varies approximately as $e^{8.5 t}$ . The total cross section decreases from 16.0 μb at 5.5 GeV to 12.3 μb at 17.8 GeV incident photon energy. A quark-model relation between $π - p$ elastic scattering and $ρ$ photoproduction gives a good representation of the data. $φ$ production also appears consistent with the predictions of the diffraction-dissociation model. We also searched for evidence of photoproduction of other particles with mass up to 2 GeV. Production of one particle of mass 1240±20 MeV and width around 100 MeV was observed. No particles with mass between 1300 and 2000 MeV were found. Any particle with cross section larger than 4% of the $ρ$ cross section would have been visible.

References (46)

R. Anderson et al., Phys. Rev. Letters 21, 384 (1968) W. G. Jones et al., ibid. 21, 586 (1968)
M. Braunschweig et al., Phys. Letters 26B, 405 (1968)
G. C. Bolon et al., Phys. Rev. Letters 18, 926 (1967)
M. P. Locher and H. Rollnik, Phys. Letters 22, 696 (1966)
J. P. Ader, M. Capdeville, and Ph. Salin, Nucl. Phys. B3, 407 (1967)
D. Bellenger et al., Phys. Rev. Letters 21, 1205 (1968)
F. M. Pipkin, in Proceedings of the Third International Symposium on Electron and Photon Interactions at High Energies, Stanford Linear Accelerator Center, 1967 (Clearing House of Federal Scientific and Technical Information, Washington, D. C., 1968)
S. C. C. Ting, in Proceedings of the Fourteenth International Conference on High-Energy Physics, Vienna, 1968 (CERN, Geneva, 1968), p. 43
G. McClellan et al., Phys. Rev. Letters 22, 374 (1969)
M. Davier et al., Phys. Rev. Letters 21, 841 (1968)
H. J. Lipkin, Phys. Rev. Letters 16, 1015 (1966) H. Joos, Phys. Letters 24B, 103 (1967) M. Davier, Phys. Rev. Letters 20, 952 (1968) B. Margolis, Nucl. Phys. B6, 687 (1968)
DESY Bubble Chamber Collaboration, Phys. Rev. 175, 1669 (1968) M. Davier et al., Phys. Letters 28B, 619 (1969)
K. Kajantie and J. S. Trefil, Phys. Letters 24B, 106 (1968)
E. Lohrmann, in Proceedings of the Third International Symposium on Electron and Photon Interactions, Stanford Linear Accelerator Center, 1967 (Clearing House of Federal Scientific and Technical Information, Washington, D. C., 1968)
R. L. Anderson, Nucl. Instr. Methods 70, 87 (1969)
R. L. Anderson et al., Nucl. Instr. Methods 66, 328 (1968)
R. L. Anderson and D. Porat, Nucl. Instr. Methods 70, 77 (1969)
Omitted endnote
Omitted endnote
R. L. Anderson, Nucl. Instr. Methods 65, 195 (1968)
G. Fisher and Y. Murata, SLAC Report No. SLAC-PUB-605, 1969 (unpublished)
D. L. Kreinick, Ph.D. thesis, California Institute of Technology (unpublished)
D. Caldwell et al. (private communication)
G. Höhler et al., Phys. Letters 20, 79 (1966)
D. Bellenger et al., in Proceedings of the Fourteenth International Conference on High-Energy Physics, Vienna, 1968 (CERN, Geneva, 1968)
A. Capella and J. Tran Thanh Van, Nuovo Cimento Letters 1, 321 (1969)
A. P. Contogouris and J. P. Lebrun, Nuovo Cimento 64A, 617 (1969)
J. Fröyland, Nucl. Phys. B11, 204 (1969)
M. L. Blackmon et al., Phys. Rev. 183, 1452 (1969)
L. Jones, California Institute of Technology (private communication) S. Mandelstam and L.-L. Wang, Phys. Rev. 160, 1490 (1967)
A. Dar et al., Phys. Rev. Letters 20, 1261 (1968)
F. Henyey et al., Phys. Rev. Letters 21, 946 (1968)
A. Dar and V. F. Weisskopf, Phys. Rev. Letters 20, 762 (1968)
B. Gorczyca and M. Hayashi, Institute of Theoretical Physics, Jagellonian University, Cracow, Poland Report (unpublished)
J. D. Jackson, Nuovo Cimento 34, 1644 (1964) F. Selleri, Phys. Letters 3, 76 (1962)
M. Ross and L. Stodolsky, Phys. Rev. 149, 1172 (1966)
P. Söding, Phys. Letters 19, 702 (1966)
Aachen-Berlin-Bonn-Hamburg-Heidelberg-München Collaboration, Phys. Letters 27B, 54 (1968)
S. D. Drell and J. S. Trefil, Phys. Rev. Letters 16, 552 (1966)
K. J. Foley et al., Phys. Rev. Letters 11, 425 (1963)
F. Bulos et al., Phys. Rev. Letters 22, 490 (1969) Asbury et al., ibid. 19, 865 (1967)
G. McClellan, Phys. Rev. Letters 22, 377 (1969)
[11]
K. J. Foley et al., Phys. Rev. Letters 11, 503 (1963) ibid.15, 45 (1965)
R. J. Oakes and J. J. Sakurai, Phys. Rev. Letters 19, 1266 (1967)
D. R. O. Morrison, Phys. Letters 22, 528 (1966)

[c1] R. Anderson et al., Phys. Rev. Letters 21, 384 (1968) W. G. Jones et al., ibid. 21, 586 (1968)

[c2] M. Braunschweig et al., Phys. Letters 26B, 405 (1968)

[c3] G. C. Bolon et al., Phys. Rev. Letters 18, 926 (1967)

[c4] M. P. Locher and H. Rollnik, Phys. Letters 22, 696 (1966)

[c5] J. P. Ader, M. Capdeville, and Ph. Salin, Nucl. Phys. B3, 407 (1967)

[c6] D. Bellenger et al., Phys. Rev. Letters 21, 1205 (1968)

[c7] F. M. Pipkin, in Proceedings of the Third International Symposium on Electron and Photon Interactions at High Energies, Stanford Linear Accelerator Center, 1967 (Clearing House of Federal Scientific and Technical Information, Washington, D. C., 1968)

[c8] S. C. C. Ting, in Proceedings of the Fourteenth International Conference on High-Energy Physics, Vienna, 1968 (CERN, Geneva, 1968), p. 43

[c9] G. McClellan et al., Phys. Rev. Letters 22, 374 (1969)

[c10] M. Davier et al., Phys. Rev. Letters 21, 841 (1968)

[c11] H. J. Lipkin, Phys. Rev. Letters 16, 1015 (1966) H. Joos, Phys. Letters 24B, 103 (1967) M. Davier, Phys. Rev. Letters 20, 952 (1968) B. Margolis, Nucl. Phys. B6, 687 (1968)

[c12] DESY Bubble Chamber Collaboration, Phys. Rev. 175, 1669 (1968) M. Davier et al., Phys. Letters 28B, 619 (1969)

[c13] K. Kajantie and J. S. Trefil, Phys. Letters 24B, 106 (1968)

[c14] E. Lohrmann, in Proceedings of the Third International Symposium on Electron and Photon Interactions, Stanford Linear Accelerator Center, 1967 (Clearing House of Federal Scientific and Technical Information, Washington, D. C., 1968)

[c15] R. L. Anderson, Nucl. Instr. Methods 70, 87 (1969)

[c16] R. L. Anderson et al., Nucl. Instr. Methods 66, 328 (1968)

[c17] R. L. Anderson and D. Porat, Nucl. Instr. Methods 70, 77 (1969)

[c18] Omitted endnote

[c19] Omitted endnote

[c20] R. L. Anderson, Nucl. Instr. Methods 65, 195 (1968)

[c21] G. Fisher and Y. Murata, SLAC Report No. SLAC-PUB-605, 1969 (unpublished)

[c22] D. L. Kreinick, Ph.D. thesis, California Institute of Technology (unpublished)

[c23] D. Caldwell et al. (private communication)

[c24] G. Höhler et al., Phys. Letters 20, 79 (1966)

[c25] D. Bellenger et al., in Proceedings of the Fourteenth International Conference on High-Energy Physics, Vienna, 1968 (CERN, Geneva, 1968)

[c26] A. Capella and J. Tran Thanh Van, Nuovo Cimento Letters 1, 321 (1969)

[c27] A. P. Contogouris and J. P. Lebrun, Nuovo Cimento 64A, 617 (1969)

[c28] J. Fröyland, Nucl. Phys. B11, 204 (1969)

[c29] M. L. Blackmon et al., Phys. Rev. 183, 1452 (1969)

[c30] L. Jones, California Institute of Technology (private communication) S. Mandelstam and L.-L. Wang, Phys. Rev. 160, 1490 (1967)

[c31] A. Dar et al., Phys. Rev. Letters 20, 1261 (1968)

[c32] F. Henyey et al., Phys. Rev. Letters 21, 946 (1968)

[c33] A. Dar and V. F. Weisskopf, Phys. Rev. Letters 20, 762 (1968)

[c34] B. Gorczyca and M. Hayashi, Institute of Theoretical Physics, Jagellonian University, Cracow, Poland Report (unpublished)

[c35] J. D. Jackson, Nuovo Cimento 34, 1644 (1964) F. Selleri, Phys. Letters 3, 76 (1962)

[c36] M. Ross and L. Stodolsky, Phys. Rev. 149, 1172 (1966)

[c37] P. Söding, Phys. Letters 19, 702 (1966)

[c38] Aachen-Berlin-Bonn-Hamburg-Heidelberg-München Collaboration, Phys. Letters 27B, 54 (1968)

[c39] S. D. Drell and J. S. Trefil, Phys. Rev. Letters 16, 552 (1966)

[c40] K. J. Foley et al., Phys. Rev. Letters 11, 425 (1963)

[c41] F. Bulos et al., Phys. Rev. Letters 22, 490 (1969) Asbury et al., ibid. 19, 865 (1967)

[c42] G. McClellan, Phys. Rev. Letters 22, 377 (1969)

[c43] [11]

[c44] K. J. Foley et al., Phys. Rev. Letters 11, 503 (1963) ibid.15, 45 (1965)

[c45] R. J. Oakes and J. J. Sakurai, Phys. Rev. Letters 19, 1266 (1967)

[c46] D. R. O. Morrison, Phys. Letters 22, 528 (1966)

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Neutral-Boson Photoproduction on Hydrogen at High Energies

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