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33 results on '"Lumsdon, S."'

1. An experimental study of the processγγ→π + π −

Author

Behrend, H. -J., Criegee, L., Field, J. H., Franke, G., Jung, H., Meyer, J., Peters, J. H., Podobrin, O., Schröder, V., Winter, G. G., Bussey, P. J., Campbell, A. J., Hendry, D., Lumsdon, S. J., Skillicorn, I. O., Ahme, J., Blobel, V., Feindt, M., Fenner, H., Harjes, J., Köhne, J. H., Spitzer, H., Weihrich, T., Apel, W. -D., Engler, J., Flügge, G., Fries, D. C., Fuster, J., Gamerdinger, K., Grosse-Wiesmann, P., Küster, H., de Boer, W., Buschhorn, G., Grindhammer, G., Gunderson, B., Kiesling, C., Kotthaus, R., Kroha, H., Lüers, D., Oberlack, H., Schacht, P., Scholz, S., Wiedenmann, W., Davier, M., Grivaz, J. F., Haissinski, J., Journé, V., Le Diberder, L., Veillet, J. -J., Blohm, K., George, R., Goldberg, M., Hamon, O., Kapusta, F., Poggioli, L., Rivoal, M., D'Agostini, G., Ferrarotto, F., Iacovacci, M., Shooshtari, G. H. B., Stella, B., Cozzika, G., Ducros, Y., Alexander, G., Beck, A., Bella, G., Grunhaus, J., Klatchko, A., Levy, A., Milsténe, C., and CELLO Collaboration

Published
1992
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2. A measurement of the π0, η and η′ electromagnetic form factors

Author

Behrend, H.-J., Criegee, L., Field, J. H., Franke, G., Jung, H., Meyer, J., Podobrin, O., Schröder, V., Winter, G. G., Bussey, P. J., Campbell, A. J., Hendry, D., Lumsdon, S. J., Skillicorn, I. O., Ahme, J., Blobel, V., Feindt, M., Fenner, H., Harjes, J., Köhne, J. H., Peters, J. H., Spitzer, H., Weihrich, T., Apel, W.-D., Engler, J., Flügge, G., Fries, D. C., Fuster, J., Gamerdinger, K., Grosse-Wiesmann, P., Küster, H., Müller, H., Ranitzsch, K. H., Schneider, H., de Boer, W., Buschhorn, G., Grindhammer, G., Gunderson, B., Kiesling, C., Kotthaus, R., Kroha, H., Lüers, D., Oberlack, H., Schacht, P., Scholz, S., Wiedenmann, W., Davier, M., Grivaz, J. F., Haissinski, J., Journé, V., Le Diberder, F., Veillet, J.-J., Blohm, K., George, R., Goldberg, M., Hamon, O., Kapusta, F., Poggioli, L., Rivoal, M., d'Agostini, G., Ferrarotto, F., Iacovacci, M., Shooshtari, G., Stella, B., Cozzika, G., Ducros, Y., Alexander, G., Beck, A., Bella, G., Grunhaus, J., Klatchko, A., Levy, A., Milsténe, C., and CELLO Collaboration

Published
1991
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3. Studies of multihadronic final states in photon-photon interactions

Author

Behrend, H. -J., Criegee, L., Field, J. H., Franke, G., Jung, H., Meyer, J., Podobrin, O., Schröder, V., Winter, G. G., Bussey, P. J., Campbell, A. J., Hendry, D., Lumsdon, S. J., Skillicorn, I. O., Ahme, J., Blobel, V., Feindt, M., Fenner, H., Harjes, J., Köhne, J. H., Peters, J. H., Spitzer, H., Weihrich, T., Apel, W. -D., Engler, J., Flügge, G., Fries, D. C., Fuster, J., Gamerdinger, K., Grosse-Wiesmann, P., Küster, H., Müller, H., Ranitzsch, K. H., Schneider, H., de Boer, W., Buschhorn, G., Grindhammer, G., Gunderson, B., Kiesling, C., Kotthaus, R., Kroha, H., Lüers, D., Oberlack, H., Schacht, P., Scholz, S., Wiedenmann, W., Davier, M., Grivaz, J. F., Haissinski, J., Journé, V., Le Diberder, F., Veillet, J. -J., Blohm, K., George, R., Goldberg, M., Hamon, O., Kapusta, F., Poggioli, L., Rivoal, M., d'Agostini, G., Ferrarotto, F., Iacovacci, M., Shooshtari, G., Stella, B., Cozzika, G., Ducros, Y., Alexander, G., Beck, A., Bella, G., Grunhaus, J., Klatchko, A., Levy, A., Milsténe, C., and CELLO Collaboration

Published
1991
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4. Limits on electron compositeness from Bhabha scattering

Author

Behrend, H. J., Criegee, L., Field, J. H., Franke, G., Jung, H., Meyer, J., Podobrin, O., Schröder, V., Winter, G. G., Bussey, P. J., Campbell, A. J., Hendry, D., Lumsdon, S., Skillicorn, I. O., Ahme, J., Blobel, V., Feindt, M., Fenner, H., Harjes, J., Köhne, J., Peters, J. H., Spitzer, H., Weihrich, T., Apel, W. D., Engler, J., Flügge, G., Fries, D. C., Fuster, J., Gamerdinger, K., Grosse-Wiesmann, P., Küster, H., Müller, H., Ranitzsch, K. H., Schneider, H., de Boer, W., Buschhorn, G., Grindhammer, G., Gunderson, B., Kiesling, C., Kotthaus, R., Kroha, H., Lüers, D., Oberlack, H., Schacht, P., Scholz, S., Wiedenmann, W., Davier, M., Grivaz, J. F., Haissinski, J., Journé, V., Le Diberder, F., Veillet, J. J., Blohm, K., George, R., Goldberg, M., Hamon, O., Kapusta, F., Poggioli, L., Rivoal, M., d'Agostini, G., Ferrarotto, F., Iacovacci, M., Shooshtari, G., Stella, B., Cozzika, G., Ducros, Y., Alexander, G., Beck, A., Bella, G., Grunhaus, J., Klatchko, A., Levy, A., Milsténe, C., and CELLO Collaboration

Published
1991
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5. A search for substructure of leptons and quarks with the CELLO detector

Author

Behrend, H. J., Criegee, L., Field, J. H., Franke, G., Jung, H., Meyer, J., Podobrin, O., Schröder, V., Winter, G. G., Bussey, P. J., Buttar, C., Campbell, A. J., Hendry, D., Lumsdon, S., Skillicorn, I. O., Ahme, J., Blobel, V., Feindt, M., Fenner, H., Harjes, J., Köhne, J., Peters, J. H., Spitzer, H., Weihrich, T., Apel, W. D., Engler, J., Flügge, G., Fries, D. C., Fuster, J., Gamerdinger, K., Grosse-Wiesmann, P., Küster, H., Müller, H., Ranitzsch, K. H., Schneider, H., de Boer, W., Buschhorn, G., Grindhammer, G., Gunderson, B., Kiesling, C., Kotthaus, R., Kroha, H., Lüers, D., Oberlack, H., Schacht, P., Scholz, S., Wiedenmann, W., Davier, M., Grivaz, J. F., Haissinski, J., Journé, V., Le Diberder, F., Veillet, J. J., Blohm, K., George, R., Goldberg, M., Hamon, O., Kapusta, F., Poggioli, L., Rivoal, M., d'Agostini, G., Ferrarotto, F., Iacovacci, M., Shooshtari, G., Stella, B., Cozzika, G., Ducros, Y., Alexander, G., Beck, A., Bella, G., Grunhaus, J., Klatchko, A., Levy, A., Milsténe, C., and CELLO Collaboration

Published
1991
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6. ρ0 production the reaction ξξ→3π+3π−ξξ→ρ0ρ0(1700)

Author

Behrend, H. -J., Criegee, L., Field, J. H., Franke, G., Jung, H., Meyer, J., Podobrin, O., Schröder, V., Winter, G. G., Bussey, P. J., Campbell, A. J., Hendry, D., Lumsdon, S., Skillicorn, I. O., Ahme, J., Blobel, V., Brehm, W., Feindt, M., Fenner, H., Harjes, J., Köhne, J. H., Peters, J. H., Spitzer, H., Apel, W. -D., Engler, J., Flügge, G., Fries, D. C., Fuster, J., Gabriel, P., Gamerdinger, K., Grosse-Wiesmann, P., Hahn, M., Hädinger, U., Hansmeyer, J., Küster, H., Müller, H., Ranitzsch, K. H., Schneider, H., Seufert, R., de Boer, W., Buschhorn, G., Grindhammer, G., Gunderson, B., Kiesling, C., Kotthaus, R., Kroha, H., Lüers, D., Oberlack, H., Schacht, P., Scholz, S., Wiedenmann, W., Davier, M., Grivaz, J. F., Haissinski, J., Journé, V., Kim, D. W., Le Diberder, F., Veillet, J. -J., Blohm, K., George, R., Goldberg, M., Hamon, O., Kapusta, F., Poggioli, L., Rivoal, M., d'Agostini, G., Ferrarotto, F., Iacovacci, M., Shooshtari, G., Stella, B., Cozzika, G., Ducros, Y., Alexander, G., Beck, A., Bella, G., Grunhaus, J., Klatchko, A., Levy, A., Milsténe, C., and CELLO Collaboration

Published
1991
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7. Exclusive τ decays with the CELLO detector at PETRA

Author

Behrend, H. J., Criegee, L., Field, J. H., Franke, G., Jung, H., Meyer, J., Podobrin, O., Schröder, V., Winter, G. G., Bussey, P. J., Campbell, A. J., Hendry, D., Lumsdon, S., Skillicorn, I. O., Ahme, J., Blobel, V., Brehm, W., Feindt, M., Fenner, H., Harjes, J., Köhne, J., Peters, J. H., Spitzer, H., Apel, W. D., Engler, J., Flügge, G., Fries, D. C., Fuster, J., Gabriel, P., Gamerdinger, K., Grosse-Wiesmann, P., Hahn, M., Hädinger, U., Hansmeyer, J., Küster, H., Müller, H., Ranitzsch, K. H., Schneider, H., Seufert, R., de Boer, W., Buschhorn, G., Grindhammer, G., Gunderson, B., Kiesling, C., Kotthaus, R., Kroha, H., Lüers, D., Oberlack, H., Schacht, P., Scholz, S., Wiedenmann, W., Davier, M., Grivaz, J. F., Haissinski, J., Journé, V., Kim, D. W., Le Diberder, F., Veillet, J. J., Blohm, K., George, R., Goldberg, M., Hamon, O., Kapusta, F., Poggioli, L., Rivoal, M., d'Agostini, G., Ferrarotto, F., Iacovacci, M., Shooshtari, G., Stella, B., Cozzika, G., Ducros, Y., Alexander, G., Beck, A., Bella, G., Grunhaus, J., Klatchko, A., Levy, A., Milsténe, C., and CELLO Collaboration

Published
1990
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8. a 2(1320) andπ 2(1670) formation in the reactionγγ→π + π − π 0

Author

Behrend, H. -J., Criegee, L., Field, J. H., Franke, G., Jung, H., Meyer, J., Podobrin, O., Schröder, V., Winter, G. G., Bussey, P. J., Campbell, A. J., Hendry, D., Lumsdon, S., Skillicorn, I. O., Ahme, J., Blobel, V., Brehm, W., Feind, M., Fenner, H., Harjes, J., Köhne, J. H., Peters, J. H., Spitzer, H., Apel, W. -D., Engler, J., Flügge, G., Fries, D. C., Fuster, J., Gabriel, P., Gamerdinger, K., Grosse-Wiesmann, P., Hahn, M., Hädinger, U., Hansmeyer, J., Küster, H., Müller, H., Ranitzsch, K. H., Schneider, H., Seufert, R., de Boer, W., Buschhorn, G., Grindhammer, G., Gunderson, B., Kiesling, Ch., Kotthaus, R., Kroha, H., Lüers, D., Oberlack, H., Schacht, P., Scholz, S., Wiedenmann, W., Davier, M., Grivaz, J. F., Haissinski, J., Journé, V., Kim, D. W., Le Diberder, F., Veillet, J. -J., Blohm, K., George, R., Goldberg, M., Hamon, O., Kapusta, F., Poggioli, L., Rivoal, M., d'Agostini, G., Ferrarotto, F., Iacovacci, M., Shooshtari, G., Stella, B., Cozzika, G., Ducros, Y., Alexander, G., Beck, A., Bella, G., Grunhaus, J., Klatchko, A., Levy, A., Milsténe, C., and CELLO Collaboration

Published
1990
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9. Inclusive strange particle production ine + e − annihilation

Author

Behrend, H. -J., Criegee, L., Field, J. H., Franke, G., Jung, H., Meyer, J., Podobrin, O., Schröder, V., Winter, G. G., Bussey, P. J., Campbell, A. J., Hendry, D., Lumsdon, S. J., Skillicorn, I. O., Ahme, J., Blobel, V., Brehm, W., Feindt, M., Fenner, H., Harjes, J., Köhne, J. H., Peters, J. H., Spitzer, H., Apel, W. -D., Engler, J., Flügge, G., Fries, D. C., Fuster, J., Gabriel, P., Gamerdinger, K., Grosse-Wiesmann, P., Hahn, M., Hädinger, U., Hansmeyer, J., Küster, H., Müller, H., Ranitzsch, K. H., Schneider, H., Seufert, R., de Boer, W., Buschhorn, G., Grindhammer, G., Gunderson, B., Kiesling, Ch., Kotthaus, R., Kroha, H., Lüers, D., Oberlack, H., Schacht, P., Scholz, S., Wiedenmann, W., Davier, M., Grivaz, J. F., Haissinski, J., Journé, V., Kim, D. W., Le Diberder, F., Veillet, J. -J., Blohm, K., George, R., Goldberg, M., Hamon, O., Kapusta, F., Poggioli, L., Rivoal, M., d'Agostini, G., Ferrarotto, F., Iacovacci, M., Shooshtari, G., Stella, B., Cozzika, G., Ducros, Y., Alexander, G., Beck, A., Bella, G., Grunhaus, J., Klatchko, A., Levy, A., Milsténe, C., and Cello Collaboration

Published
1990
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10. Heavy quark charge asymmetries with the CELLO detector

Author

Behrend, H. J., Criegee, L., Field, J. H., Franke, G., Jung, H., Meyer, J., Podobrin, O., Schröder, V., Winter, G. G., Bussey, P. J., Campbell, A. J., Hendry, D., Lumsdon, S., Skillicorn, I. O., Ahme, J., Blobel, V., Brehm, W., Feindt, M., Fenner, H., Harjes, J., Köhne, J., Peters, J. H., Spitzer, H., Apel, W. D., Engler, J., Flügge, G., Fries, D. C., Fuster, J., Gabriel, P., Gamerdinger, K., Grosse-Wiesmann, P., Hahn, M., Hädinger, U., Hansmeyer, J., Küster, H., Müller, H., Ranitzsch, K. H., Schneider, H., Seufert, R., de Boer, W., Buschhorn, G., Grindhammer, G., Gunderson, B., Kiesling, C., Kotthaus, R., Kroha, H., Lüers, D., Oberlack, H., Schacht, P., Scholz, S., Wiedenmann, W., Davier, M., Grivaz, J. F., Haissinski, J., Journé, V., Kim, D. W., Le Diberder, F., Veillet, J. J., Blohm, K., George, R., Goldberg, M., Hamon, O., Kapusta, F., Poggioli, L., Rivoal, M., d'Agostini, G., Ferrarotto, F., Iacovacci, M., Shooshtari, G., Stella, B., Cozzika, G., Ducros, Y., Alexander, G., Beck, A., Bella, G., Grunhaus, J., Klatchko, A., Levy, A., Milsténe, C., and CELLO Collaboration

Published
1990
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11. Studies of multihadronic final states in photon-photon interactions

Author

Behrend, H. J., Criegee, L., Field, J. H., Franke, G., Jung, H., Meyer, J., Podobrin, O., Schroder, V., Winter, G. G., Bussey, P. J., Campbell, A. J., Hendry, D., Lumsdon, S., Skillicorn, I. O., Ahme, J., Blobel, V., Feindt, M., Fenner, H., Harjes, J., Kohne, J., Peters, J. H., Spitzer, H., Weihrich, T., Apel, W. D., Engler, J., Flugge, G., Fries, D. C., Fuster, J., Gamerdinger, K., Grosse-Wiesmann, P., Kuster, H., Muller, H., Ranitzsch, K. H., Schneider, H., de Boer, W., Buschhorn, G., Grindhammer, Guenter, Gunderson, B., Kiesling, Christian M., Kotthaus, R., Kroha, H., Luers, D., Oberlach, H., Schacht, P., Scholz, S., Wiedenmann, W., Davier, M., Grivaz, J. F., Haissinski, J., Journe, V., Le Diberder, F., Veillet, J. J., Blohm, K., George, R., Goldberg, M., Hamon, O., Kapusta, Frederic, Poggioli, L., Rivoal, M., d'Agostini, G., Ferrarotto, F., Iacovacci, M., Shooshtari, G., Stella, B., Cozzika, G., Ducros, Y., Alexander, G., Beck, A., Bella, G., Grunhaus, J., Klatchko, A., Levy, A., Milstene, C., and CELLO Collaboration

Subjects
two-photon [exchange], fragmentation [model], vector dominance, momentum transfer [cross section], jet [electroproduction], interaction [photon photon], photon photon: interaction, jet: electroproduction, cross section: momentum transfer, hadron: multiple production, spectrum: transverse momentum, ddc:530, angular distribution, electron positron [colliding beams], hadron [multiple production], multiple production [hadron], electroproduction [jet], exchange: two-photon, photon photon [interaction], quark model parton, electron positron: colliding beams, transverse momentum [spectrum], ((4, electroproduction: jet, interaction: photon photon, multiple production: hadron, transverse momentum: spectrum, colliding beams: electron positron, model: fragmentation, DESY PETRA Stor, colliding beams [electron positron], two-photon: exchange, CELLO, spectrum [transverse momentum], thrust [jet], jet: thrust, exchange [two-photon], experimental results
Abstract

24 pp. (1991)., We have measured the cross section and $Q^2$-dependence of the reaction γγ→ multihadrons, using the CELLO detector at DESY, for visible final-state masses between 4 and 9 GeV. The data are well fitted by an incoherent sum of Generalised Vector Meson Dominance and Quark Parton Model terms, but at lowQ2 require the addition of a third component which resembles the QPM but is less two-jet-like. With and without this term, the GVDM cross section atQ2=0 is found to be 200±20 and 250±25 nb, respectively.

Published
1991
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18. Cross section measurement and spin-parity analysis of the reaction γγ → ωϱ

Author

Behrend, H.-J., primary, Criegee, L., additional, Field, J.H., additional, Franke, G., additional, Jung, H., additional, Meyer, J., additional, Podobrin, O., additional, Schröder, V., additional, Winter, G.G., additional, Bussey, P.J., additional, Campbell, A.J., additional, Hendry, D., additional, Lumsdon, S., additional, Skillicorn, I.O., additional, Ahme, J., additional, Blobel, V., additional, Feindt, M., additional, Fenner, H., additional, Harjes, J., additional, Köhne, J.H., additional, Peters, J.H., additional, Spitzer, H., additional, Weihrich, T., additional, Apel, W.-D., additional, Engler, J., additional, Flügge, G., additional, Fries, D.C., additional, Fuster, J., additional, Gamerdinger, K., additional, Grosse-Weismann, P., additional, Küster, H., additional, Müller, H., additional, Ranitzsch, K.H., additional, Schneider, H., additional, de Boer, W., additional, Buschhorn, G., additional, Grindhammer, G., additional, Gunderson, B., additional, Kiesling, Ch., additional, Kotthaus, R., additional, Kroha, H., additional, Lüers, D., additional, Oberlack, H., additional, Schacht, P., additional, Scholz, S., additional, Wiedenmann, W., additional, Davier, M., additional, Grivaz, J.F., additional, Haissinski, J., additional, Journé, V., additional, Le Diberder, F., additional, Veillet, J.-J., additional, Blohm, K., additional, George, R., additional, Goldberg, M., additional, Hamon, O., additional, Kapusta, F., additional, Poggioli, L., additional, Rivoal, M., additional, d'Agostini, G., additional, Ferrarotto, F., additional, Iacovacci, M., additional, Shooshtari, G., additional, Stella, B., additional, Cozzika, G., additional, Ducros, Y., additional, Alexander, G., additional, Beck, A., additional, Bella, G., additional, Grunhaus, J., additional, Klatchko, A., additional, Levy, A., additional, and Milsténe, C., additional

Published
1991
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19. Global properties of pion production in the reaction γγ→3π+3π-

Author

Behrend, H.-J., primary, Criegee, L., additional, Field, J.H., additional, Franke, G., additional, Jung, H., additional, Meyer, J., additional, Podobrin, O., additional, Schröder, V., additional, Winter, G.G., additional, Bussey, P.J., additional, Campbell, A.J., additional, Hendry, D., additional, Lumsdon, S., additional, Skillicorn, I.O., additional, Ahme, J., additional, Blobel, V., additional, Brehm, W., additional, Feindt, M., additional, Fenner, H., additional, Harjes, J., additional, Köhne, J.H., additional, Peters, J.H., additional, Spitzer, H., additional, Apel, W.-D., additional, Engler, J., additional, Flügge, G., additional, Fries, D.C., additional, Fuster, J., additional, Gabriel, P., additional, Gamerdinger, K., additional, Grosse-Wiesmann, P., additional, Hahn, M., additional, Hädinger, U., additional, Hansmeyer, J., additional, Küster, H., additional, Müller, H., additional, Ranitzsch, K.H., additional, Schneider, H., additional, Seufert, R., additional, de Boer, W., additional, Buschhorn, G., additional, Grindhammer, G., additional, Gunderson, B., additional, Kiesling, Ch., additional, Kotthaus, R., additional, Kroha, H., additional, Lüers, D., additional, Oberlack, H., additional, Schacht, P., additional, Scholz, S., additional, Wiedenmann, W., additional, Davier, M., additional, Grivaz, J.F., additional, Haissinski, J., additional, Journé, V., additional, Kim, D.W., additional, Le Diberder, F., additional, Veillet, J.-J., additional, Blohm, K., additional, George, R., additional, Goldberg, M., additional, Hamon, O., additional, Kapusta, F., additional, Poggioli, L., additional, Rivoal, M., additional, d'Agostini, G., additional, Ferrarotto, F., additional, Iacovacci, M., additional, Shooshtari, G., additional, Stella, B., additional, Cozzika, G., additional, Ducros, Y., additional, Alexander, G., additional, Beck, A., additional, Bella, G., additional, Grunhaus, J., additional, Klatchko, A., additional, Levy, A., additional, and Milsténe, C., additional

Published
1990
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20. An experimental study of the process γγ→ π π.

Author

Behrend, H., Criegee, L., Field, J., Franke, G., Jung, H., Meyer, J., Peters, J., Podobrin, O., Schröder, V., Winter, G., Bussey, P., Campbell, A., Hendry, D., Lumsdon, S., Skillicorn, I., Ahme, J., Blobel, V., Feindt, M., Fenner, H., and Harjes, J.

Abstract

Using the CELLO detector, we have measured cross sections for the process γγ→ π π in the mass range 0.75-1.9 GeV/c. A partial wave fit to the data indicates the presence of a sizeable S-wave amplitude with signs of resonant behaviour. Values for the γγ width of the f(1270) are given, showing the model-dependence of this quantity. At higher dipion masses, the model of Brodsky and Lepage is found to give an order of magnitude description of the data. [ABSTRACT FROM AUTHOR]

Published
1992
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21. a(1320) and π(1670) formation in the reaction γγ→ π π π.

Author

Behrend, H., Criegee, L., Field, J., Franke, G., Jung, H., Meyer, J., Podobrin, O., Schröder, V., Winter, G., Bussey, P., Campbell, A., Hendry, D., Lumsdon, S., Skillicorn, I., Ahme, J., Blobel, V., Brehm, W., Feind, M., Fenner, H., and Harjes, J.

Abstract

The reaction e e→ e eπππ in the untagged mode has been measured with the CELLO detector at PETRA. The cross section is dominated by exclusive a(1320) production, whose radiative width is determined to be Γ=1.00±0.07(stat.)±0.15(syst.)keV. An angular correlation analysis indicates pure helicity 2 with an upper limit on the helicity 0 contribution of 8.2% (at 95% c.l.). Excitation of the pseudotensor meson π(1670) is observed for the first time in this reaction. The π radiative width and its dependence on interference effects are studied. [ABSTRACT FROM AUTHOR]

Published
1990
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22. Inclusive strange particle production in e e annihilation.

Author

Behrend, H., Criegee, L., Field, J., Franke, G., Jung, H., Meyer, J., Podobrin, O., Schröder, V., Winter, G., Bussey, P., Campbell, A., Hendry, D., Lumsdon, S., Skillicorn, I., Ahme, J., Blobel, V., Brehm, W., Feindt, M., Fenner, H., and Harjes, J.

Abstract

We present an analysis of strange particle production from e e annihilation into multihadronic final states. The experiment was performed with the CELLO detector at the PETRA storage ring at DESY, the data was taken at a centre of mass energy of 35 GeV with an integrated luminosity of 86 pb. The particles K, K and Λ have been identified by their characteristic decays, and differential cross sections for their production have been obtained. From a comparison of K and K rates the Lund vector meson suppression parameter V/(V+P) has been determined. [ABSTRACT FROM AUTHOR]

Published
1990
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23. Assembly of Colloidal Particles into Microwires Using an Alternating Electric Field

Author

Lumsdon, S. O. and Scott, D. M.

Abstract

We have investigated the dielectrophoretic assembly of colloidal gold, carbon black, and carbon nanotubes into electrical wires. The resulting microwires have diameters less than 1 μm, with lengths ranging from 5 μm to 3 mm. Current−voltage curves for these wires indicate an ohmic response, where the resistance is determined by the type of colloid and by the frequency of the alternating field used to grow the wires. The predicted frequency dependence of dielectrophoresis is confirmed by experiment. Measurements of the threshold voltage for initial wire growth are also presented. These experiments demonstrate that a variety of nanoparticles can be assembled into microwires for sensor applications.

Published
2005

24. Two-Dimensional Crystallization of Microspheres by a Coplanar AC Electric Field

Author

Lumsdon, S. O., Kaler, E. W., and Velev, O. D.

Abstract

The particle−field and particle−particle interactions induced by alternating electric fields can be conveniently used for on-chip assembly of colloidal crystals. Two coplanar electrodes with a millimeter-sized gap between them are used here to assemble two-dimensional crystals from suspensions of either latex or silica microspheres. When an AC voltage is applied, the particles accumulate and crystallize on the surface between the electrodes. Light diffraction and microscopic observations demonstrate that the hexagonal crystal is always oriented with one axis along the direction of the field. The particles disassemble when the field is turned off, and the process can be repeated many times. The diffraction patterns from all consecutively formed crystals are identical. This assembly is driven by forces that depend on the electric field gradient, and a model is proposed involving a combination of dielectrophoresis and induced dipole chaining. The organization of large two-dimensional crystals allows characterization of the electrostatic interactions in the particle ensembles. The process can be controlled via the field strength, the frequency, and the viscosity of the liquid media. It could be used to make rudimentary optical switches or to separate mixtures of particles of different sizes.

Published
2004

25. Effects of oil type and aqueous phase composition on oil–water mixtures containing particles of intermediate hydrophobicity

Author

Binks, B. P. and Lumsdon, S. O.

Abstract

The behaviour of emulsions stabilised by partially hydrophobic spherical silica particles is described for systems in which the oil type is varied in mixtures with water, and for toluene-containing systems in which water is replaced by other polar solvents. Using contact angle measurements on flat glass substrates, we deduce that particles are more hydrophobic at polar oil–water interfaces (esters and alcohols), preferring water-in-oil (w/o) emulsions, and more hydrophilic at non-polar oil–water interfaces (alkanes), with the preferred emulsion type being oil-in-water (o/w). Formamide systems are similar to those of water, whereas emulsions could not be prepared with glycerol or ethylene glycol. In contrast to a surfactant-stabilised emulsion, we find that the preferred emulsion type depends on the initial location of particles in that the continuous phase is the phase in which particles are first dispersed. Using undecanol as oil, we observe an interesting phenomenon during the complete breakdown of viscous w/o emulsions involving contraction to retain the shape of the vessel. Finally, we determine the partitioning of particles between toluene and water and show that particles can be rendered more hydrophilic by simply increasing the pH of the aqueous phase. An increase in the wettability by water in this way is used to shed new light on the behaviour of different particle-containing systems involved in demulsification, flotation and antifoaming.

Published
2000

26. Stability of oil-in-water emulsions stabilised by silica particles

Author

P. Binks, B and O. Lumsdon, S

Abstract

We describe the preparation and properties of oil-in-water emulsions stabilised by colloidal silica particles alone. The charge on the particles and their extent of flocculation, assessed via turbidity measurements, can be modified by pH control and addition of simple electrolytes. The stability of emulsions to both creaming and coalescence is low in the absence of electrolyte, and the effects of adding salt are dependent on the type of salt. In systems containing NaCl, emulsions are less stable once the particles are flocculated. In the presence of either LaCl3 or tetraethylammonium bromide (TEAB), emulsion stability increases dramatically for conditions where the silica particles are weakly flocculated; extensive flocculation of the particles however leads to destabilisation of the emulsions. For TEAB, relatively large emulsions of diameter around 40 µm remain very stable for up to 3 months at salt concentrations corresponding to the onset of coagulation of the colloid. Such emulsions are themselves strongly flocculated.

Published
1999
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27. An experimental study of the processγγ→π+π−

Author

Behrend, H. -J., Criegee, L., Field, J. H., Franke, G., Jung, H., Meyer, J., Peters, J. H., Podobrin, O., Schröder, V., Winter, G. G., Bussey, P. J., Campbell, A. J., Hendry, D., Lumsdon, S. J., Skillicorn, I. O., Ahme, J., Blobel, V., Feindt, M., Fenner, H., Harjes, J., Köhne, J. H., Spitzer, H., Weihrich, T., Apel, W. -D., Engler, J., Flügge, G., Fries, D. C., Fuster, J., Gamerdinger, K., Grosse-Wiesmann, P., Küster, H., de Boer, W., Buschhorn, G., Grindhammer, G., Gunderson, B., Kiesling, C., Kotthaus, R., Kroha, H., Lüers, D., Oberlack, H., Schacht, P., Scholz, S., Wiedenmann, W., Davier, M., Grivaz, J. F., Haissinski, J., Journé, V., Le Diberder, L., Veillet, J. -J., Blohm, K., George, R., Goldberg, M., Hamon, O., Kapusta, F., Poggioli, L., Rivoal, M., D'Agostini, G., Ferrarotto, F., Iacovacci, M., Shooshtari, G. H. B., Stella, B., Cozzika, G., Ducros, Y., Alexander, G., Beck, A., Bella, G., Grunhaus, J., Klatchko, A., Levy, A., and Milsténe, C.

Abstract

Using the CELLO detector, we have measured cross sections for the processγγ→π+π− in the mass range 0.75–1.9 GeV/c2. A partial wave fit to the data indicates the presence of a sizeableS-wave amplitude with signs of resonant behaviour. Values for the γγ width of thef2(1270) are given, showing the model-dependence of this quantity. At higher dipion masses, the model of Brodsky and Lepage is found to give an order of magnitude description of the data.

Published
1992
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28. Inclusive strange particle production ine+e− annihilation

Author

Behrend, H. -J., Criegee, L., Field, J. H., Franke, G., Jung, H., Meyer, J., Podobrin, O., Schröder, V., Winter, G. G., Bussey, P. J., Campbell, A. J., Hendry, D., Lumsdon, S. J., Skillicorn, I. O., Ahme, J., Blobel, V., Brehm, W., Feindt, M., Fenner, H., Harjes, J., Köhne, J. H., Peters, J. H., Spitzer, H., Apel, W. -D., Engler, J., Flügge, G., Fries, D. C., Fuster, J., Gabriel, P., Gamerdinger, K., Grosse-Wiesmann, P., Hahn, M., Hädinger, U., Hansmeyer, J., Küster, H., Müller, H., Ranitzsch, K. H., Schneider, H., Seufert, R., de Boer, W., Buschhorn, G., Grindhammer, G., Gunderson, B., Kiesling, Ch., Kotthaus, R., Kroha, H., Lüers, D., Oberlack, H., Schacht, P., Scholz, S., Wiedenmann, W., Davier, M., Grivaz, J. F., Haissinski, J., Journé, V., Kim, D. W., Le Diberder, F., Veillet, J. -J., Blohm, K., George, R., Goldberg, M., Hamon, O., Kapusta, F., Poggioli, L., Rivoal, M., d'Agostini, G., Ferrarotto, F., Iacovacci, M., Shooshtari, G., Stella, B., Cozzika, G., Ducros, Y., Alexander, G., Beck, A., Bella, G., Grunhaus, J., Klatchko, A., Levy, A., and Milsténe, C.

Abstract

We present an analysis of strange particle production frome+e- annihilation into multihadronic final states. The experiment was performed with the CELLO detector at the PETRA storage ring at DESY, the data was taken at a centre of mass energy of 35 GeV with an integrated luminosity of 86 pb-1. The particlesKS0,K*± and ? have been identified by their characteristic decays, and differential cross sections for their production have been obtained. From a comparison ofKS0 andK*± rates the Lund vector meson suppression parameterV/(V+P)S has been determined.

Published
1990
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29. a2(1320) andπ2(1670) formation in the reactionγγ→π+π−π0

Author

Behrend, H. -J., Criegee, L., Field, J. H., Franke, G., Jung, H., Meyer, J., Podobrin, O., Schröder, V., Winter, G. G., Bussey, P. J., Campbell, A. J., Hendry, D., Lumsdon, S., Skillicorn, I. O., Ahme, J., Blobel, V., Brehm, W., Feind, M., Fenner, H., Harjes, J., Köhne, J. H., Peters, J. H., Spitzer, H., Apel, W. -D., Engler, J., Flügge, G., Fries, D. C., Fuster, J., Gabriel, P., Gamerdinger, K., Grosse-Wiesmann, P., Hahn, M., Hädinger, U., Hansmeyer, J., Küster, H., Müller, H., Ranitzsch, K. H., Schneider, H., Seufert, R., de Boer, W., Buschhorn, G., Grindhammer, G., Gunderson, B., Kiesling, Ch., Kotthaus, R., Kroha, H., Lüers, D., Oberlack, H., Schacht, P., Scholz, S., Wiedenmann, W., Davier, M., Grivaz, J. F., Haissinski, J., Journé, V., Kim, D. W., Le Diberder, F., Veillet, J. -J., Blohm, K., George, R., Goldberg, M., Hamon, O., Kapusta, F., Poggioli, L., Rivoal, M., d'Agostini, G., Ferrarotto, F., Iacovacci, M., Shooshtari, G., Stella, B., Cozzika, G., Ducros, Y., Alexander, G., Beck, A., Bella, G., Grunhaus, J., Klatchko, A., Levy, A., and Milsténe, C.

Abstract

The reactione+e−→e+e−π+π−π0 in the untagged mode has been measured with the CELLO detector at PETRA. The cross section is dominated by exclusivea2(1320) production, whose radiative width is determined to beΓγγ=1.00±0.07(stat.)±0.15(syst.)keV. An angular correlation analysis indicates pure helicity 2 with an upper limit on the helicity 0 contribution of 8.2% (at 95% c.l.). Excitation of the pseudotensor meson π20(1670) is observed for the first time in this reaction. The π2 radiative width and its dependence on interference effects are studied.

Published
1990
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30. A measurement of the π0, η and η′ electromagnetic form factors

Author

Behrend, H.-J., Criegee, L., Field, J. H., Franke, G., Jung, H., Meyer, J., Podobrin, O., Schröder, V., Winter, G. G., Bussey, P. J., Campbell, A. J., Hendry, D., Lumsdon, S. J., Skillicorn, I. O., Ahme, J., Blobel, V., Feindt, M., Fenner, H., Harjes, J., Köhne, J. H., Peters, J. H., Spitzer, H., Weihrich, T., Apel, W.-D., Engler, J., Flügge, G., Fries, D. C., Fuster, J., Gamerdinger, K., Grosse-Wiesmann, P., Küster, H., Müller, H., Ranitzsch, K. H., Schneider, H., de Boer, W., Buschhorn, G., Grindhammer, G., Gunderson, B., Kiesling, C., Kotthaus, R., Kroha, H., Lüers, D., Oberlack, H., Schacht, P., Scholz, S., Wiedenmann, W., Davier, M., Grivaz, J. F., Haissinski, J., Journé, V., Le Diberder, F., Veillet, J.-J., Blohm, K., George, R., Goldberg, M., Hamon, O., Kapusta, F., Poggioli, L., Rivoal, M., d'Agostini, G., Ferrarotto, F., Iacovacci, M., Shooshtari, G., Stella, B., Cozzika, G., Ducros, Y., Alexander, G., Beck, A., Bella, G., Grunhaus, J., Klatchko, A., Levy, A., and Milsténe, C.

Abstract

We present measurement of the p0?*?, ??*? and ?'?*? form factors. The p0-form factor is for the first time observed in the space-like region. The transition form factor of the ?-meson is determined from its decay modes p+p-p0, p+p-? and the neutral decay mode ??. The decay of the ?' is observed in the decay channels ??, ?p+p- with ???? and in the four charged prong final state stemming from ?p+p- with the ? decaying into p+p-(p0/?). All form factors agree well with a simple ?-pole predicted by the vector meson dominance model and also with the QCD inspired Brodsky-Lepage model.

Published
1991
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31. ρ0 production the reaction ξξ→3π+3π−ξξ→ρ0ρ0(1700)

Author

Behrend, H. -J., Criegee, L., Field, J. H., Franke, G., Jung, H., Meyer, J., Podobrin, O., Schröder, V., Winter, G. G., Bussey, P. J., Campbell, A. J., Hendry, D., Lumsdon, S., Skillicorn, I. O., Ahme, J., Blobel, V., Brehm, W., Feindt, M., Fenner, H., Harjes, J., Köhne, J. H., Peters, J. H., Spitzer, H., Apel, W. -D., Engler, J., Flügge, G., Fries, D. C., Fuster, J., Gabriel, P., Gamerdinger, K., Grosse-Wiesmann, P., Hahn, M., Hädinger, U., Hansmeyer, J., Küster, H., Müller, H., Ranitzsch, K. H., Schneider, H., Seufert, R., de Boer, W., Buschhorn, G., Grindhammer, G., Gunderson, B., Kiesling, C., Kotthaus, R., Kroha, H., Lüers, D., Oberlack, H., Schacht, P., Scholz, S., Wiedenmann, W., Davier, M., Grivaz, J. F., Haissinski, J., Journé, V., Kim, D. W., Le Diberder, F., Veillet, J. -J., Blohm, K., George, R., Goldberg, M., Hamon, O., Kapusta, F., Poggioli, L., Rivoal, M., d'Agostini, G., Ferrarotto, F., Iacovacci, M., Shooshtari, G., Stella, B., Cozzika, G., Ducros, Y., Alexander, G., Beck, A., Bella, G., Grunhaus, J., Klatchko, A., Levy, A., and Milsténe, C.

Abstract

We have studied the ρ0 production rate in the reaction ξξ→3π+3π− in the energy range 1.6≦Wγγ≦7.5 GeV with the CELLO detector at PETRA. Our analysis points to a substantial yield of ρ0ρ0π+π− events in particular atWγγ>4.0 GeV. We give cross sections for the ρ02π+2π− and ρ0ρ0π+π− final states and calculate upper limits for the reaction γγ→ρ0ρ0 (1700) →ρ0ρ0π+π−.

Published
1991
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32. A measurement of the ?0, ? and ?? electromagnetic form factors

Author

H. Spitzer, K. H. Ranitzsch, Luc Poggioli, G. Shooshtari, M. Feindt, T. Weihrich, S. Scholz, B. Gunderson, G. G. Winter, A. Klatchko, J. H. Peters, J. H. Köhne, W. De Boer, F. Kapusta, G. Grindhammer, L. Criegee, S. Lumsdon, J. H. Field, M. Rivoal, F. Ferrarotto, F. Le Diberder, Hubert Kroha, J. Engler, C. Milstene, R. George, J. Grunhaus, Jean-Francois Grivaz, D. C. Fries, O. Podobrin, G. Buschhorn, H. J. Behrend, C. Kiesling, J. Ahme, M. Davier, A. J. Campbell, H. Fenner, Jean-Arcady Meyer, G. Cozzika, J. Fuster, A. Beck, Y. Ducros, Hannes Jung, Horst Oberlack, J. J. Veillet, M. Goldberg, H. Müller, G. Franke, J. Harjes, G. D'Agostini, K. Blohm, B. Stella, P. Grosse-Wiesmann, J. Haissinski, V. Journé, G. Flügge, D. Lüers, V. Schröder, Werner Wiedenmann, O. Hamon, Gideon Bella, Gideon Alexander, H. Schneider, I. O. Skillicorn, W. D. Apel, P. J. Bussey, D. Hendry, Peter Schacht, H. Küster, K. Gamerdinger, M. Iacovacci, Aharon Levy, Volker Blobel, R. Kotthaus, Behrend, H. -J., Criegee, L., Field, J. H., Franke, G., Jung, H., Meyer, J., Podobrin, O., Schr�der, V., Winter, G. G., Bussey, P. J., Campbell, A. J., Hendry, D., Lumsdon, S. J., Skillicorn, I. O., Ahme, J., Blobel, V., Feindt, M., Fenner, H., Harjes, J., K�hne, J. H., Peters, J. H., Spitzer, H., Weihrich, T., Apel, W. -D., Engler, J., Fl�gge, G., Fries, D. C., Fuster, J., Gamerdinger, K., Grosse-Wiesmann, P., K�ster, H., M�ller, H., Ranitzsch, K. H., Schneider, H., Boer, W., Buschhorn, G., Grindhammer, G., Gunderson, B., Kiesling, C., Kotthaus, R., Kroha, H., L�ers, D., Oberlack, H., Schacht, P., Scholz, S., Wiedenmann, W., Davier, M., Grivaz, J. F., Haissinski, J., Journ�, V., Diberder, F., Veillet, J. -J., Blohm, K., George, R., Goldberg, M., Hamon, O., Kapusta, F., Poggioli, L., Rivoal, SOLENE PIERRE MARIE, D'Agostinis, Giovanni, Ferrarotto, F., Iacovacci, M., Shooshtari, G., Stella, B., Cozzika, G., Ducros, Y., Alexander, G., Beck, A., Bella, G., Grunhaus, J., Klatchko, A., Levy, A., and Milst�ne, C.

Subjects
Physics, Nuclear physics, Quantum chromodynamics, Particle physics, Physics and Astronomy (miscellaneous), Form factor (quantum field theory), Field theory (psychology), Elementary particle, Vector meson dominance, Quantum field theory, gamma-gamma physics, electromagnetic form factors, Engineering (miscellaneous)
Abstract

We present measurement of the π0γ*γ, ηγ*γ and η′γ*γ form factors. The π0-form factor is for the first time observed in the space-like region. The transition form factor of the η-meson is determined from its decay modes π+π-π0, π+π-γ and the neutral decay mode γγ. The decay of the η′ is observed in the decay channels ργ, ηπ+π- with η→γγ and in the four charged prong final state stemming from ηπ+π- with the η decaying into π+π-(π0/γ). All form factors agree well with a simple ρ-pole predicted by the vector meson dominance model and also with the QCD inspired Brodsky-Lepage model. © 1991 Springer-Verlag.

Published
1991
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33. Dielectrophoretic assembly of electrically functional microwires from nanoparticle suspensions.

Author

Hermanson KD, Lumsdon SO, Williams JP, Kaler EW, and Velev OD

Abstract

A new class of microwires can be assembled by dielectrophoresis from suspensions of metallic nanoparticles. The wires are formed in the gaps between planar electrodes and can grow faster than 50 micrometers per second to lengths exceeding 5 millimeters. They have good ohmic conductance and automatically form electrical connections to conductive islands or particles. The thickness and the fractal dimension of the wires can be controlled, and composite wires with a metallic core surrounded by a latex shell can be assembled. The simple assembly process and their high surface-to-volume ratio make these structures promising for wet electronic and bioelectronic circuits.

Published
2001
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