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15 results on '"Silvester, I. M."'

1. A measurement of muon pair production ine + e − annihilation at centre of mass energies 35.0≤ $$\sqrt s $$ ≤46.8 GeV

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., Bernardi, E., Chwastowski, J., Eskreys, A., Gather, K., Genser, K., Hultschig, H., Joos, P., Kowalski, H., Ladage, A., Löhr, B., Lüke, D., Mättig, P., Notz, D., Pawlak, J. M., Pösnecker, K. -U., Ros, E., Trines, D., Walczak, R., Wolf, G., Kolanoski, H., Kracht, T., Krüger, J., Lohrmann, E., Poelz, G., Zeuner, W., Hassard, J., Shulman, J., Su, D., Barreiro, F., Hervas, L., Leites, A., del Peso, J., Traseira, M., Balkwill, C., Bowler, M. G., Burrows, P. N., Cashmore, R. J., Hawkes, C. M., 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., Duchovni, E., Eisenberg, Y., Karshon, U., Mikenberg, G., Montag, A., Revel, D., Ronat, E., Wainer, A. N., Yekutieli, G., Muller, D., Ritz, S., Strom, D., Takashima, M., Wu, Sau Lan, Zobernig, G., and TASSO Collaboration

Published
1988
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2. Measurement of the average lifetime ofB hadrons

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., Löhr, B., Lüke, D., Mättig, P., Notz, D., Pawlak, J. M., Pösnecker, K. -U., Ros, E., Trines, D., Walczak, R., Wolf, G., Kolanoski, H., Kracht, T., Krüger, J., Lohrmann, E., Poelz, G., Zeuner, W., Belk, A., Binnie, D. M., Hassard, J., Shulman, J., Su, D., Leites, A., del Peso, J., Balkwill, C., Bowler, M. G., Burrows, P. N., Cashmore, R. J., 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., Wu, Sau Lan, Zobernig, G., and TASSO Collaboration

Published
1989
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3. A measurement of electroweak effects in the reactione + e − → τ+τ− at 35.0 and 42.4 GeV

Author

Braunschweig, W., Gerhards, R., Kirschfink, F. J., Martyn, H. -U., Fischer, H. M., Partmann, H., Hartmann, J., Hilger, E., Jocksch, A., Wedemeyer, R., Foster, B., Martin, A. J., Bernardi, E., Chwastowski, J., Gather, K., Genser, K., Kowalski, H., Löhr, B., Lüke, D., Notz, D., Pawlak, J. M., Pösnecker, K. -U., Ros, E., Walczak, R., Wolf, G., Kolanoski, H., Krüger, J., Lohrmann, E., Poelz, G., Zeuner, W., Hassard, J., Shulman, J., Su, D., Tomalin, I. R., Barreiro, F., Leites, A., del Peso, J., Traseira, M., Balkwill, C., Bowler, M. G., Burrows, P. N., Cashmore, R. J., Heath, G. P., Ratoff, P. N., Silvester, I. M., Veitch, M. E., Hart, J. C., Saxon, D. H., Brandt, S., Holder, M., Eisenberg, Y., Karshon, U., Mikenberg, G., Montag, A., Revel, D., Ronat, E., Wainer, A. N., Yekutieli, G., Muller, D., Ritz, S., Takashima, M., Wu, Sau Lan, Zobernig, G., and TASSO Collaboration

Published
1989
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4. Measurement of the two-photon reactionγγ →π + π − π + π − at large values ofQ 2

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., Löhr, B., Lüke, D., Mättig, P., Notz, D., Pawlak, J. M., Pösnecker, K. -U., Ros, E., Trines, D., Walczak, R., Wolf, G., Kolanoski, H., Kracht, T., Krüger, J., Lohrmann, E., Poelz, G., Zeuner, W., Binnie, D. M., Hassard, J., Shulman, J., Su, D., Leites, A., del Peso, J., Balkwill, C., Bowler, M. G., Burrows, P. N., 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., Wu, Sau Lan, Zobernig, G., and TASSO Collaboration

Published
1988
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5. Jet fragmentation and QCD models ine + e − annihilation at c.m. energies between 12.0 and 41.5 GeV

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., Bernardi, E., Chwastowski, J., Eskreys, A., Gather, K., Genser, K., Hultschig, H., Joos, P., Kowalski, H., Ladage, A., Löhr, B., Lüke, D., Mättig, P., Notz, D., Pawlak, J. M., Pösnecker, K. -U., Ros, E., Trines, D., Walczak, R., Wolf, G., Kolanoski, H., Kracht, T., Krüger, J., Lohrmann, E., Poelz, G., Zeuner, W., Hassard, J., Shulman, J., Su, D., Barreiro, F., Leites, A., del Peso, J., Balkwill, C., Bowler, M. G., Burrows, P. N., Cashmore, R. J., 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., Muller, D., Ritz, S., Strom, D., Takashima, M., Wu, Sau Lan, Zobernig, G., and TASSO Collaboration

Published
1988
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6. A study of jets fromb quarks produced ine + e − annihilations at $$\sqrt s = 35 - 46$$ GeV

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., Bernardi, E., Chwastowski, J., Eskreys, A., Gather, K., Genser, K., Hultschig, H., Joos, P., Kowalski, H., Ladage, A., Löhr, B., Lüke, D., Mattig, P., Notz, D., Pawlak, J., Pösnecker, K. -U., Ros, E., Schütte, W., Trines, D., Walczak, R., Wolf, G., Kolanoski, H., Kracht, T., Krüger, J., Lohrmann, E., Poelz, G., Zeuner, W., Belk, A. T., Binnie, D. M., Hassard, J. F., Shulman, J., Su, D., Barreiro, F., Leites, A., del Peso, J., Balkwill, C., Bowler, M. G., Burrows, P. N., Cashmore, R. J., Heath, G. P., Ratoff, P., Silvester, I. M., Tomalin, I., Veitch, M. E., Yelton, J. M., Lloyd, S. L., 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., Muller, D., Ritz, S., Strom, D., Takashima, M., Wu, Sau Lan, Zobernig, G., and TASSO Collaboration

Published
1989
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7. 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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8. Strange baryon production ine + e − annihilation

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., Bernardi, E., Chwastowski, J., Eskreys, A., Gather, K., Genser, K., Hultschig, H., Joos, P., Kowalski, H., Ladage, A., Löhr, B., Lüke, D., Mattig, P., Notz, D., Pawlak, J. M., Posnecker, K. -U., Ros, E., Schütte, W., Trines, D., Walczak, R., Wolf, G., Kolanoski, H., Kracht, T., Krüger, J., Lohrmann, E., Poelz, G., Zeuner, W., Binnie, D. M., Hassard, J., Shulman, J., Su, D., Barreiro, F., Leites, A., Hervas, L., del Peso, J., Traseira, M., Balkwill, C., Bowler, M. G., Burrows, P. N., Cashmore, R. J., Heath, G. P., Ratoff, P. N., Silvester, I. M., Tomalin, I. R., Veitch, M. E., Yelton, J. M., Lloyd, S. L., 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., Muller, D., Ritz, S., Strom, D., Takashima, M., Wu, Sau Lan, Zobernig, G., and TASSO Collaboration

Published
1989
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9. A measurement of muon pair production ine + e − annihilation at centre of mass energies $$35.0 \leqq \sqrt s \leqq 46.8$$ GeV

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., Bernardi, E., Chwastowski, J., Eskreys, A., Gather, K., Genser, K., Hultschig, H., Joos, P., Kowalski, H., Ladage, A., Löhr, B., Lüke, D., Mättig, P., Notz, D., Pawlak, J. M., Pösnecker, K. -U., Ros, E., Trines, D., Walczak, R., Wolf, G., Kolanoski, H., Kracht, T., Krüger, J., Lohrmann, E., Poelz, G., Zeuner, W., Hassard, J., Shulman, J., Su, D., Barreiro, F., Hervas, L., Leites, A., del Peso, J., Traseira, M., Balkwill, C., Bowler, M. G., Burrows, P. N., Cashmore, R. J., Hawkes, C. M., 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., Duchovni, E., Eisenberg, Y., Karshon, U., Mikenberg, G., Montag, A., Revel, D., Ronat, E., Wainer, A. N., Yekutieli, G., Muller, D., Ritz, S., Strom, D., Takashima, M., Wu, Sau Lan, Zobernig, G., and TASSO Collaboration

Published
1989
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10. A measurement of electroweak effects in the reactione+e− → τ+τ− at 35.0 and 42.4 GeV

Author

Braunschweig, W., Gerhards, R., Kirschfink, F. J., Martyn, H. -U., Fischer, H. M., Partmann, H., Hartmann, J., Hilger, E., Jocksch, A., Wedemeyer, R., Foster, B., Martin, A. J., Bernardi, E., Chwastowski, J., Gather, K., Genser, K., Kowalski, H., Löhr, B., Lüke, D., Notz, D., Pawlak, J. M., Pösnecker, K. -U., Ros, E., Walczak, R., Wolf, G., Kolanoski, H., Krüger, J., Lohrmann, E., Poelz, G., Zeuner, W., Hassard, J., Shulman, J., Su, D., Tomalin, I. R., Barreiro, F., Leites, A., del Peso, J., Traseira, M., Balkwill, C., Bowler, M. G., Burrows, P. N., Cashmore, R. J., Heath, G. P., Ratoff, P. N., Silvester, I. M., Veitch, M. E., Hart, J. C., Saxon, D. H., Brandt, S., Holder, M., Eisenberg, Y., Karshon, U., Mikenberg, G., Montag, A., Revel, D., Ronat, E., Wainer, A. N., Yekutieli, G., Muller, D., Ritz, S., Takashima, M., Wu, Sau Lan, and Zobernig, G.

Abstract

We report on total cross section and forward backward charge asymmetry measurements of the reactione+e- ? t+t- 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 reactionse+e-?l+l- has been performed.

Published
1989
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11. 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, and Zobernig, G.

Abstract

The inclusive production of p± andK± mesons and of protons and antiprotons ine+e- annihilations has been measured at 34 GeV and 44 GeV center of mass energy; in addition p± mesons have been measured at 44 GeV c.m. energy. Differential cross sections and particle yields are given. At 34 GeV average multiplicities are: $$\begin{gathered} \left\langle {n\left( {\pi ^ \pm } \right)} \right\rangle = 10.9 \pm 0.5,\left\langle {n\left( {K^ \pm } \right)} \right\rangle = 1.76 \pm 0.20, \hfill \\ \left\langle {n\left( {p + \bar p} \right)} \right\rangle = 0.67 \pm 0.06 \hfill \\ \end{gathered} $$ and at 44 GeV: $$\left\langle {n\left( {\pi ^ \pm } \right)} \right\rangle = 11.1 \pm 0.5,\left\langle {n\left( {\pi ^0 } \right)} \right\rangle = 5.4 \pm 1.0.$$

Published
1989
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12. A study of jets fromb quarks produced ine+e− annihilations at <img src="/fulltext-image.asp?format=htmlnonpaginated&src=M158034825661433_html\10052_2005_Article_BF01565125_TeX2GIFIE1.gif" border="0" alt=" $$

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., Bernardi, E., Chwastowski, J., Eskreys, A., Gather, K., Genser, K., Hultschig, H., Joos, P., Kowalski, H., Ladage, A., Löhr, B., Lüke, D., Mattig, P., Notz, D., Pawlak, J., Pösnecker, K. -U., Ros, E., Schütte, W., Trines, D., Walczak, R., Wolf, G., Kolanoski, H., Kracht, T., Krüger, J., Lohrmann, E., Poelz, G., Zeuner, W., Belk, A. T., Binnie, D. M., Hassard, J. F., Shulman, J., Su, D., Barreiro, F., Leites, A., del Peso, J., Balkwill, C., Bowler, M. G., Burrows, P. N., Cashmore, R. J., Heath, G. P., Ratoff, P., Silvester, I. M., Tomalin, I., Veitch, M. E., Yelton, J. M., Lloyd, S. L., 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., Muller, D., Ritz, S., Strom, D., Takashima, M., Wu, Sau Lan, and Zobernig, G.

Abstract

Ab enrichment technique using the longB lifetime has been developed, by which ∼600 hadronic events with >65%b purity are obtained. The properties of the associated jets are studied, with comparisons made between them and those in hadronic data in whichb quarks make up only 10% of the total, and jets in Monte Carlo events. The distributions in rapidity and multiplicity yield two new determinations of the fragmentation variablez forb hadrons and confirm that theb fragmentation function is hard. We also present the first measurement of the relative strength of the strong interaction coupling of theb quark compared with the average of all flavours.

Published
1989
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13. A measurement of muon pair production ine+e− annihilation at centre of mass energies 35.0≤ <img src="/fulltext-image.asp?format=htmlnonpaginated&src=M4221N1LN3801R3W_html\10052_2005_Article_BF01555879_TeX2GIFIE1.gi

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., Bernardi, E., Chwastowski, J., Eskreys, A., Gather, K., Genser, K., Hultschig, H., Joos, P., Kowalski, H., Ladage, A., Löhr, B., Lüke, D., Mättig, P., Notz, D., Pawlak, J. M., Pösnecker, K. -U., Ros, E., Trines, D., Walczak, R., Wolf, G., Kolanoski, H., Kracht, T., Krüger, J., Lohrmann, E., Poelz, G., Zeuner, W., Hassard, J., Shulman, J., Su, D., Barreiro, F., Hervas, L., Leites, A., del Peso, J., Traseira, M., Balkwill, C., Bowler, M. G., Burrows, P. N., Cashmore, R. J., Hawkes, C. M., 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., Duchovni, E., Eisenberg, Y., Karshon, U., Mikenberg, G., Montag, A., Revel, D., Ronat, E., Wainer, A. N., Yekutieli, G., Muller, D., Ritz, S., Strom, D., Takashima, M., Wu, Sau Lan, and Zobernig, G.

Abstract

The reactione+e−→µ+µ− has been studied at centre of mass energies between 35.0 and 46.8 GeV using the TASSO detector at PETRA. We present measurements of the forward-backward charge asymmetry (Aμμ) and cross section σμμ for this reaction at three energies. At 35.0 GeV we obtain a cross section relative to the QED prediction ofRμμ=σμμ/σo=0.932±0.018±0.044 andAμμ=(−10.6−2.3+2.2±0.5)%. At 38.3 GeV we findRμμ=0.951±0.072−0.057+0.063 andAμμ=(+1.7−8.6+8.5±0.5)%. At 43.6 GeV we measureRμμ=0.921±0.037±0.055 andAμμ=(−17.6−4.3+4.4±0.5)%. Our results are in good agreement with the predictions of the standard model. Including previous TASSO data we present improved determinations of muonic electroweak parameters. We also report on lower limits of possible contributions from contact interactions.

Published
1988
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14. Measurement of the two-photon reactionγγ →π+π−π+π− at large values ofQ2

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., Löhr, B., Lüke, D., Mättig, P., Notz, D., Pawlak, J. M., Pösnecker, K. -U., Ros, E., Trines, D., Walczak, R., Wolf, G., Kolanoski, H., Kracht, T., Krüger, J., Lohrmann, E., Poelz, G., Zeuner, W., Binnie, D. M., Hassard, J., Shulman, J., Su, D., Leites, A., del Peso, J., Balkwill, C., Bowler, M. G., Burrows, P. N., 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., Wu, Sau Lan, and Zobernig, G.

Abstract

The process γγ→π+π−π+π− has been investigated in reactions of the typee+e−→e+e−π+π−π+π− in the single tag mode. The range of the four momentum squared of one of the virtual photons was 0.28 GeV2/c2≦Q2≦3.6 GeV2/c2, the average being 〈Q2〉=0.92 GeV2/c2; the other photon was quasi real. The reaction is mainly described by the channels γγ→ρ0ρ0 and γγ→4π (phase space), occuring with about equal probability. TheQ2-dependence of the cross section is in agreement with the ρ form factor.

Published
1988
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15. Jet fragmentation and QCD models ine+e− annihilation at c.m. energies between 12.0 and 41.5 GeV

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., Bernardi, E., Chwastowski, J., Eskreys, A., Gather, K., Genser, K., Hultschig, H., Joos, P., Kowalski, H., Ladage, A., Löhr, B., Lüke, D., Mättig, P., Notz, D., Pawlak, J. M., Pösnecker, K. -U., Ros, E., Trines, D., Walczak, R., Wolf, G., Kolanoski, H., Kracht, T., Krüger, J., Lohrmann, E., Poelz, G., Zeuner, W., Hassard, J., Shulman, J., Su, D., Barreiro, F., Leites, A., del Peso, J., Balkwill, C., Bowler, M. G., Burrows, P. N., Cashmore, R. J., 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., Muller, D., Ritz, S., Strom, D., Takashima, M., Wu, Sau Lan, and Zobernig, G.

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.

Published
1988
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