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8 results on '"Lohr B"'

1. JET FRAGMENTATION AND QCD MODELS IN EPSILON+EPSILON- ANNIHILATION AT CM ENERGIES BETWEEN 12.0 AND 41.5 GEV

Author

Braunschweig, W, Gerhards, R, Kirschfink, F, Martyn, H, Bock, B, Fischer, H, Hartmann, H, Hartmann, J, Hilger, E, Jocksch, A, Wedemeyer, R, Foster, B, Martin, A, Sephton, A, Bernardi, E, Chwastowski, J, Eskreys, A, Gather, K, Genser, K, Hultschig, H, Joos, P, Kowalski, H, Ladage, A, Lohr, B, and Luke, D

Abstract

The large amount of data accumulated by the TASSO detector at 35 GeV c.m. energy has been compared with the predictions of the latest generation of perturbative QCD+fragmentation models. By adjustment of the arbitrary parameters of these models, a very good description of the global properties of hadronic events was obtained. No one model gave the best description of all features of the data, each model being better than the others for some observables and worse in other quantities. We interpret these results in terms of the underlying QCD and hadronisation schemes. The trends of the data across the energy range 12.0≦W≦41.5 GeV are generally well reproduced by the models with the parameters optimised at 35 GeV. © 1988 Springer-Verlag.

Published
2016

2. EXPERIMENTAL-STUDY OF THE ORIENTATION OF 3-JET EVENTS IN E+E- ANNIHILATION AT PETRA

Author

Braunschweig, W, Gerhards, R, Kirschfink, F, Martyn, H, Fischer, H, Hartmann, H, Hartmann, J, Hilger, E, Jocksch, A, Wedemeyer, R, Foster, B, Martin, A, Barreiro, F, Bernardi, E, Chwastowski, J, Eskreys, A, Gather, K, Genser, K, Hultschig, H, Joos, P, Korner, J, Kowalski, H, Ladage, A, Lohr, B, and Luke, D

Abstract

The full TASSO data have been used to study the orientation of three-jet events in e+e- annihilation. The polar angle distributions of the normal to the three-jet plane as well as the polar angle distribution of the most energetic jet have been measured as a function of the thrust cut-off used to select the three-jet sample. The data corrected for radiation and detector effects are compared to QCD predictions and fair agreement is found. As a consistency check we also present measurements of the azimuthal correlations between the lepton and hadron planes. A significant azimuthal dependence is found, consistent again with the QCD predictions. © 1990 Springer-Verlag.

Published
2016

3. A MEASUREMENT OF ELECTROWEAK EFFECTS IN THE REACTION E+E--]TAU+TAU- AT 35.0 AND 42.4-GEV

Author

Braunschweig, W, Gerhards, R, Kirschfink, F, Martyn, H, Fischer, H, Hartmann, H, Hartmann, J, Hilger, E, Jocksch, A, Wedemeyer, R, Foster, B, Martin, A, Bernardi, E, Chwastowski, J, Gather, K, Genser, K, Kowalski, H, Lohr, B, Luke, D, Notz, D, Pawlak, J, Posnecker, K, Ros, E, Walczak, R, and Wolf, G

Abstract

We report on total cross section and forward backward charge asymmetry measurements of the reaction e+e- → τ+τ- at centre of mass energies of 35.0 GeV and 42.4 GeV using the TASSO detector. Including previous data an analysis in terms of electroweak parameters of the standard model is presented, and lower limits on mass scale parameters of residual contact interactions are given. A combined analysis of electroweak couplings using all our results on leptonic reactions e+e-→l+l- has been performed. © 1989 Springer-Verlag.

Published
2016

4. STUDY OF ETA-C PRODUCTION IN 2-PHOTON COLLISIONS

Author

Braunschweig, W, Gerhards, R, Kirschfink, F, Martyn, H, Bock, B, Fischer, H, Hartmann, H, Hartmann, J, Hilger, E, Jocksch, A, Mertens, V, Wedemeyer, R, Foster, B, Martin, A, Sephton, A, Bernardi, E, Chwastowski, J, Eskreys, A, Gather, K, Genser, K, Hultschig, H, Joos, P, Kowalski, H, Ladage, A, and Lohr, B

Abstract

Production of the ηc meson in e+e- quasireal two photon collisions has been looked for in three channels. The data were obtained from an integrated luminosity of 189 pb-1. An ηc signal is observed in two decay modes (Ks0K±π∓,π+π-π+π-) with a combined statistical significance of 3.5 standard deviations. Using the known ηc branching ratios to these channels and to K+K-π+π- the combined partial ηc width to γγ is Γγγ(ηc). The first error is statistical, and the second one includes the systematic and branching ratio errors. Calculated as an upper limit we obtain Γγγ(ηc) (95% C.L., including the systematic error). © 1989 Springer-Verlag.

Published
2016

5. Pion, kaon and proton cross sections ine + e − annihilation at 34 GeV and 44 GeV c.m. energy

Author

Braunschweig, W., Gerhards, R., Kirschfink, F. J., Martyn, H. -U., Bock, B., Fischer, H. M., Hartmann, H., Hartmann, J., Hilger, E., Jocksch, A., Wedemeyer, R., Foster, B., Martin, A. J., Sephton, A. J., Barreiro, F., Bernardi, E., Chwastowski, J., Eskreys, A., Gather, K., Genser, K., Hultschig, H., Joos, P., Kowalski, H., Ladage, A., Lohr, B., Lüke, D., Mattig, P., Notz, D., Pawlak, J. M., Pösnecker, K. -U., Ros, E., Trines, D., Walczak, R., Wolf, G., Kolanoski, H., Gerhardt, W., Kracht, T., Krasemann, H. L., Krüger, J., Lohrmann, E., Poelz, G., Rehders, P., Tysarczyk, G., Winand, C., Zeuner, W., Binnie, D. M., Hassard, J., Shulman, J., Su, D., Leites, A., del Peso, J., Balkwill, C., Bowler, M. G., Burrows, P. N., Cashmore, R., Heath, G. P., Ratoff, P. N., Silvester, I. M., Tomalin, I. R., Veitch, M. E., Forden, G. E., Hart, J. C., Saxon, D. H., Brandt, S., Holder, M., Labarga, L., Eisenberg, Y., Karshon, U., Mikenberg, G., Montag, A., Revel, D., Ronat, E., Shapira, A., Wainer, N., Yekutieli, G., Caldwell, A., Muller, D., Ritz, S., Strom, D., Takashima, M., Wicklund, E., Lan Wu, Sau, Zobernig, G., and TASSO Collaboration

Published
1989
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6. An improved measurement of electroweak couplings frome + e −→e + e − ande + e −→μ + μ −

Author

Althoff, M., Braunschweig, W., Kirschfink, F. J., Lübelsmeyer, K., Martyn, H. -U., Peise, G., Rimkus, J., Rosskamp, P., Sander, H. G., Schmitz, D., Siebke, H., Wallraff, W., Fischer, H. M., Hartmann, H., Hillen, W., Jocksch, A., Knop, G., Köpke, L., Kolanoski, H., Kück, H., Wedemeyer, R., Wermes, N., Wollstadt, M., Burkhardt, H., Eisenberg, Y., Gather, K., Hultschig, H., Joos, P., Koch, W., Kötz, U., Kowalski, H., Ladage, A., Lohr, B., Lüke, D., Mättig, P., Notz, D., Pyrlik, J., Quarrie, D. R., Rushton, M., Schütte, W., Trines, D., Wolf, G., Xiao, Ch., Fohrmann, R., Hilger, E., Kracht, T., Krasemann, H. L., Leu, P., Lohrmann, E., Pandoulas, D., Poelz, G., Wiik, B. H., Beuselinck, R., Binnie, D. M., Campbell, A. J., Dornan, P. J., Foster, B., Garbutt, D. A., Jenkins, C., Jones, T. D., Jones, W. G., McCardle, J., Sedgbeer, J. K., Wan Abdullah, W. A. T., Bell, K. W., Bowler, M. G., Brock, I. C., Cashmore, R. J., Clarke, P. E. L., Devenish, R., Grossmann, P., Llyod, S. L., Salmon, G. L., Thomas, J., Wyatt, T. R., Youngman, C., Hart, J. C., Harvey, J., Hasell, D. K., Proudfoot, J., Saxon, D. H., Woodworth, P. L., Barreiro, F., Dittmar, M., Holder, M., Neumann, B., Duchovni, E., Karshon, U., Mikenberg, G., Mir, R., Revel, D., Ronat, E., Shapira, A., Yekutieli, G., Barklow, T., Caldwell, A., Cherney, M., Izen, J. M., Mermikides, M., Rudolph, G., Strom, D., Venkataramania, H., Wicklund, E., Wu, Sau Lan, Zobernig, G., and TASSO Collaboration

Published
1984
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