Search

Your search keyword '"Ahme, J."' showing total 2 results
Start Over Author "Ahme, J." Topic physics
2 results on '"Ahme, J."'

1. Determination of αs and sin2θw from measurements of the total hadronic cross section in e+e− annihilation

Author

Behrend, H. -J, Bürger, J., Criegee, L., Dainton, J. B., Fenner, H., Field, J. H., Franke, G., Fuster, J., Holler, Y., Meyer, J., Schröder, V., Sindt, H., Timm, U., Winter, G. G., Zimmermann, W., Bussey, P. J., Buttar, C., Campbell, A. J., Hendry, D., Mccurrach, G., Scarr, J. M., Skillicorn, I. O., Smith, K. M., Ahme, J., Blobel, V., Feindt, M., Harjes, J., Poppe, M., Spitzer, H., Apel, W. -D, Böhrer, A., Engler, J., Flügge, G., Fries, D. C., Fues, W., Gamerdinger, K., Grosse-Wiesmann, P., Hansmeyer, J., Hopp, G., Jung, H., Johannes Knapp, Krüger, M., Küster, H., Mayer, P., Müller, H., Ranitzsch, K. H., Schneider, H., Wolf, J., Boer, W., Buschhorn, G., Grindhammer, G., Gunderson, B., Kiesling, Ch, Kotthaus, R., Kroha, H., Lüers, D., Oberlack, H., Sack, B., Schacht, P., Shooshtari, G., Wiedenmann, W., Cordier, A., Davier, M., Fournier, D., Gaillard, M., Grivaz, J. F., Haissinski, J., Janot, P., Journé, V., Le Diberder, F., Ros, E., Spadafora, A., Veillet, J. -J, Fatah, B., George, R., Goldberg, M., Hamon, O., Kapusta, F., Kovacs, F., Poggioli, L., Rivoal, M., D Agostini, G., Ferrarotto, F., Gaspero, M., Stella, B., Aleksan, R., Cozzika, G., Ducros, Y., Lavagne, Y., Ould Saada, F., Pamela, J., Pierre, F., Žačék, J., Alexander, G., Bella, G., Gnat, Y., Grunhaus, J., and Levy, A.

Subjects
Nuclear physics, Quantum chromodynamics, Quark, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Luminosity (scattering theory), Electron–positron annihilation, Electroweak interaction, Hadron, Weinberg angle
Abstract

We have measured the total normalized cross section R for the process e+e− → hadrons at centre-of-mass energies between 14.0 and 46.8 GeV based on an integrated luminosity of 60.3 pb−1. The data are well described by the standard SU(3)c⊗SU(2)L⊗U(1) model with the production of the five known quarks. No open production of a sixth quark with charge 2/3 or 1/3 occurs below a centre-of-mass energy of 46.6 or 46.3 GeV, respectively. A fitting procedure which takes the correlations between measurements into account was used to determine the electroweak mixing angle sin2θw and the strong coupling constant αs(S) in second-order QCD. We applied this procedure to the CELLO data and in addition included the data from other experiments at PETRA and PEP. Both fits give consistent results. The fit to the combined data yields αs(342 GeV2) = 0.165±0.030, and sin2θw = 0.236±0.020. Fixing sin2θw at the world average value of 0.23 yields αs(342GeV2) = 0.169±0.025.

Published
1987
Full Text
View/download PDF

2. 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
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results