Direct photon production in proton-antiproton interactions at √s = 24.3 GeV

A. Bernasconi; R. E. Breedon; L. Camilleri; R. L. Cool; P. T. Cox; L. Dick; E. C. Dukes; B. Gabioud; F. Gaille; P. Giacomelli; J. B. Jeanneret; C. Joseph; W. Kubischta; J. F. Loude; E. Malamud; C. Morel; O. E. Overseth; J. L. Pagès; J. P. Perroud; P. Petersen; D. Ruegger; R. W. Rusack; G. R. Snow; G. Sozzi; M. T. Tran; A. Vacchi; G. Valenti; G. Von Dardel

doi:10.1016/0370-2693(88)91281-6

Direct photon production in proton-antiproton interactions at √s = 24.3 GeV

A. Bernasconi, R. E. Breedon, L. Camilleri, R. L. Cool, P. T. Cox, L. Dick, E. C. Dukes, B. Gabioud, F. Gaille, P. Giacomelli, J. B. Jeanneret, C. Joseph, W. Kubischta, J. F. Loude, E. Malamud, C. Morel, O. E. Overseth, J. L. Pagès, J. P. Perroud, P. PetersenD. Ruegger, R. W. Rusack, G. R. Snow, G. Sozzi, M. T. Tran, A. Vacchi, G. Valenti, G. Von Dardel

Physics and Astronomy (Twin Cities)

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Abstract

Direct photons have been studied in pp̄ interactions at √s = 24.3 GeV and in the transverse momentum (p_T) range 3-7 GeV/c(0.25 < x_T < 0.58). The experiment was performed using an internal H₂ cluster the target in the CERN pp̄ Collider. The measured invariant cross section is compared with recent theoretical predictions.

Original language	English (US)
Pages (from-to)	163-168
Number of pages	6
Journal	Physics Letters B
Volume	206
Issue number	1
DOIs	https://doi.org/10.1016/0370-2693(88)91281-6
State	Published - May 12 1988

Bibliographical note

Funding Information:
Direct photons are expected to be produced in hadronic collisions ~ through three processes: gluon Compton scattering, quark-antiquark annihilations, and bremsstrahlung offa quark line. The bremsstrahlung contribution has been shown to be small [ 2 ]. In pp collisions, where direct photons were first observed [ 3 ], the main contribution has been shown to come from gluon Compton scattering [4,5 ]. This is explained by the absence of valence antiquarks in the proton, which are necessary for the annihilation mechanism. Valence antiquarks in n-, n+ and 15 allow an appreciable annihilation contribution in collisions of these particles with protons. Several experiments involving pions have been performed Permanent address: Fermilab, Batavia, IL 60510, USA. 2 Also at INFN, 1-40126 Bologna, Italy. 3 Work supported by the Swiss National Science Foundation. 4 Work supported by the US Department of Energy. 5 Work supported by the US National Science Foundation. ~t See ref. [ 1 ] for a review.

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Bernasconi, A., Breedon, R. E., Camilleri, L., Cool, R. L., Cox, P. T., Dick, L., Dukes, E. C., Gabioud, B., Gaille, F., Giacomelli, P., Jeanneret, J. B., Joseph, C., Kubischta, W., Loude, J. F., Malamud, E., Morel, C., Overseth, O. E., Pagès, J. L., Perroud, J. P., ... Von Dardel, G. (1988). Direct photon production in proton-antiproton interactions at √s = 24.3 GeV. Physics Letters B, 206(1), 163-168. https://doi.org/10.1016/0370-2693(88)91281-6

Bernasconi, A, Breedon, RE, Camilleri, L, Cool, RL, Cox, PT, Dick, L, Dukes, EC, Gabioud, B, Gaille, F, Giacomelli, P, Jeanneret, JB, Joseph, C, Kubischta, W, Loude, JF, Malamud, E, Morel, C, Overseth, OE, Pagès, JL, Perroud, JP, Petersen, P, Ruegger, D, Rusack, RW, Snow, GR, Sozzi, G, Tran, MT, Vacchi, A, Valenti, G & Von Dardel, G 1988, 'Direct photon production in proton-antiproton interactions at √s = 24.3 GeV', Physics Letters B, vol. 206, no. 1, pp. 163-168. https://doi.org/10.1016/0370-2693(88)91281-6

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title = "Direct photon production in proton-antiproton interactions at √s = 24.3 GeV",

abstract = "Direct photons have been studied in p{\=p} interactions at √s = 24.3 GeV and in the transverse momentum (pT) range 3-7 GeV/c(0.25 < xT < 0.58). The experiment was performed using an internal H2 cluster the target in the CERN p{\=p} Collider. The measured invariant cross section is compared with recent theoretical predictions.",

author = "A. Bernasconi and Breedon, {R. E.} and L. Camilleri and Cool, {R. L.} and Cox, {P. T.} and L. Dick and Dukes, {E. C.} and B. Gabioud and F. Gaille and P. Giacomelli and Jeanneret, {J. B.} and C. Joseph and W. Kubischta and Loude, {J. F.} and E. Malamud and C. Morel and Overseth, {O. E.} and Pag{\`e}s, {J. L.} and Perroud, {J. P.} and P. Petersen and D. Ruegger and Rusack, {R. W.} and Snow, {G. R.} and G. Sozzi and Tran, {M. T.} and A. Vacchi and G. Valenti and {Von Dardel}, G.",

note = "Funding Information: Direct photons are expected to be produced in hadronic collisions ~ through three processes: gluon Compton scattering, quark-antiquark annihilations, and bremsstrahlung offa quark line. The bremsstrahlung contribution has been shown to be small [ 2 ]. In pp collisions, where direct photons were first observed [ 3 ], the main contribution has been shown to come from gluon Compton scattering [4,5 ]. This is explained by the absence of valence antiquarks in the proton, which are necessary for the annihilation mechanism. Valence antiquarks in n-, n+ and 15 allow an appreciable annihilation contribution in collisions of these particles with protons. Several experiments involving pions have been performed Permanent address: Fermilab, Batavia, IL 60510, USA. 2 Also at INFN, 1-40126 Bologna, Italy. 3 Work supported by the Swiss National Science Foundation. 4 Work supported by the US Department of Energy. 5 Work supported by the US National Science Foundation. ~t See ref. [ 1 ] for a review.",

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T1 - Direct photon production in proton-antiproton interactions at √s = 24.3 GeV

AU - Bernasconi, A.

AU - Breedon, R. E.

AU - Camilleri, L.

AU - Cool, R. L.

AU - Cox, P. T.

AU - Dick, L.

AU - Dukes, E. C.

AU - Gabioud, B.

AU - Gaille, F.

AU - Giacomelli, P.

AU - Jeanneret, J. B.

AU - Joseph, C.

AU - Kubischta, W.

AU - Loude, J. F.

AU - Malamud, E.

AU - Morel, C.

AU - Overseth, O. E.

AU - Pagès, J. L.

AU - Perroud, J. P.

AU - Petersen, P.

AU - Ruegger, D.

AU - Rusack, R. W.

AU - Snow, G. R.

AU - Sozzi, G.

AU - Tran, M. T.

AU - Vacchi, A.

AU - Valenti, G.

AU - Von Dardel, G.

N1 - Funding Information: Direct photons are expected to be produced in hadronic collisions ~ through three processes: gluon Compton scattering, quark-antiquark annihilations, and bremsstrahlung offa quark line. The bremsstrahlung contribution has been shown to be small [ 2 ]. In pp collisions, where direct photons were first observed [ 3 ], the main contribution has been shown to come from gluon Compton scattering [4,5 ]. This is explained by the absence of valence antiquarks in the proton, which are necessary for the annihilation mechanism. Valence antiquarks in n-, n+ and 15 allow an appreciable annihilation contribution in collisions of these particles with protons. Several experiments involving pions have been performed Permanent address: Fermilab, Batavia, IL 60510, USA. 2 Also at INFN, 1-40126 Bologna, Italy. 3 Work supported by the Swiss National Science Foundation. 4 Work supported by the US Department of Energy. 5 Work supported by the US National Science Foundation. ~t See ref. [ 1 ] for a review.

PY - 1988/5/12

Y1 - 1988/5/12

N2 - Direct photons have been studied in pp̄ interactions at √s = 24.3 GeV and in the transverse momentum (pT) range 3-7 GeV/c(0.25 < xT < 0.58). The experiment was performed using an internal H2 cluster the target in the CERN pp̄ Collider. The measured invariant cross section is compared with recent theoretical predictions.

AB - Direct photons have been studied in pp̄ interactions at √s = 24.3 GeV and in the transverse momentum (pT) range 3-7 GeV/c(0.25 < xT < 0.58). The experiment was performed using an internal H2 cluster the target in the CERN pp̄ Collider. The measured invariant cross section is compared with recent theoretical predictions.

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ER -

Direct photon production in proton-antiproton interactions at √s = 24.3 GeV

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Bibliographical note

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