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XI-(1320) AND XI-(1530) PRODUCTION IN K-P INTERACTIONS AT 4.2 GEV-C

NUCLEAR PHYSICS B 178:1 (1981) 1-30

Authors:

M MAZZUCATO, D PENNINO, M AGUILARBENITEZ, R ARMENTEROS, C DIONISI, P GAVILLET, M LOSTY, PF LOVERRE, R BLOKZIJL, B JONGEJANS, JC KLUYVER, J ENGELEN, WK KITTEL, W METZGER, R VANDEWALLE, B FOSTER, P GROSSMAN, J WELLS
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Evidence for a spin-1 gluon in three-jet events

Physics Letters B 97:3-4 (1980) 453-458

Authors:

R Brandelik, W Braunschweig, K Gather, V Kadansky, FJ Kirschfink, K Lübelsmeyer, HU Martyn, G Peise, J Rimkus, HG Sander, D Schmitz, AS von Dratzig, D Trines, W Wallraff, H Boerner, HM Fischer, H Hartmann, E Hilger, W Hillen, G Knop, L Koepke, H Kolanoski, P Leu, B Löhr, R Wedemeyer, N Wermes, M Wollstadt, H Burkhardt, DG Cassel, D Heyland, H Hultschig, P Joos, W Koch, P Koehler, U Kötz, H Kowalski, A Ladage, D Lüke, HL Lynch, P Mättig, G Mikenberg, D Notz, J Pyrlik, R Riethmüller, M Schliwa, P Söding, BH Wiik, G Wolf, R Fohrmann, M Holder, G Poelz, O Römer, R Rüsch, P Schmüser, I Al-Agil, DM Binnie, PJ Dornan, MA Downie, DA Garbutt, WG Jones, SL Lloyd, D Pandoulas, J Sedgbeer, RA Stern, S Yarker, C Youngman, RJ Barlow, IC Brock, RJ Cashmore, R Devenish, P Grossmann, J Illingworth, M Ogg, B Roe, GL Salmon, TR Wyatt, KW Bell, B Foster, JC Hart, J Proudfoot, DR Quarrie, DH Saxon, PL Woodworth, E Duchovni, Y Eisenberg, U Karshon, D Revel, E Ronat, A Shapira, T Barklow, J Freeman, P Lecomte, T Meyer, G Rudolph, E Wicklund, SL Wu, G Zobernig

Abstract:

High-energy e+e--annihilation events obtained in the TASSO detector at PETRA have been used to determine the spin of the gluon in the reaction e+e- → qqg. We analysed angular correlations between the three jet axes. While vector gluons are consistent with the data (55% confidence limit), scalar gluons are disfavoured by 3.8 standard deviations, corresponding to a confidence level of about 10-4. Our conclusion is free of possible biases due to uncertainties in the fragmentation process or in determining the qqg kinematics from the observed hadrons. © 1980.
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RHO-RHO production by two photon scattering

Physics Letters B 97:3-4 (1980) 448-452

Authors:

R Brandelik, W Braunschweig, K Gather, V Kadansky, K Lübelsmeyer, HU Martyn, G Peise, J Rimkus, HG Sander, D Schmitz, AS von Dratzig, D Trines, W Wallraff, H Boerner, HM Fischer, H Hartmann, E Hilger, W Hillen, G Knop, L Koepke, H Kolanoski, P Leu, B Löhr, R Wedemeyer, N Wermes, M Wollstadt, H Burkhardt, DG Cassel, D Heyland, H Hultschig, P Joos, W Koch, P Koehler, U Kötz, H Kowalski, A Ladage, D Lüke, HL Lynch, P Mättig, G Mikenberg, D Notz, J Pyrlik, R Riethmüller, M Schliwa, P Söding, BH Wiik, G Wolf, R Fohrmann, M Holder, G Poelz, O Römer, R Rüsch, P Schmüser, DM Binnie, PJ Dornan, NA Downie, DA Garbutt, WG Jones, SL Lloyd, D Pandoulas, J Sedgbeer, S Yarker, C Youngman, RJ Barlow, I Brock, RJ Cashmore, R Devenish, P Grossmann, J Illingworth, M Ogg, B Roe, GL Salmon, T Wyatt, KW Bell, B Foster, JC Hart, J Proudfoot, DR Quarrie, DH Saxon, PL Woodworth, E Duchovni, Y Eisenberg, U Karshon, D Revel, E Ronat, A Shapira, J Freeman, P Lecomte, T Meyer, SL Wu, G Zobernig
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Production and properties of the τ-lepton in e+e- annihilation at C.M. energies from 12 to 31.6 GeV

Physics Letters B 92:1-2 (1980) 199-205

Authors:

R Brandelik, W Braunschweig, K Gather, V Kadansky, K Lübelsmeyer, P Mättig, HU Martyn, G Peise, J Rimkus, HG Sander, D Schmitz, AS von Dratzig, D Trines, W Wallraff, H Boerner, HM Fischer, H Hartmann, E Hilger, W Hillen, G Knop, P Leu, B Löhr, R Wedemeyer, N Wermes, M Wollstadt, DG Cassel, D Heyland, H Hultschig, P Joos, W Koch, P Koehler, U Kötz, H Kowalski, A Ladage, D Lüke, HL Lynch, G Mikenberg, D Notz, J Pyrlik, R Riethmüller, M Schliwa, P Söding, BH Wiik, G Wolf, R Fohrmann, M Holder, G Poelz, O Römer, R Rüsch, P Schmüser, DM Binnie, PJ Dornan, NA Downie, DA Garbutt, WG Jones, SL Lloyd, D Pandoulas, J Sedgbeer, S Yarker, C Youngman, RJ Barlow, I Brock, RJ Cashmore, R Devenish, P Grossmann, J Illingworth, M Ogg, B Roe, GL Salmon, T Wyatt, KW Bell, B Foster, JC Hart, J Proudfoot, DR Quarrie, DH Saxon, PL Woodworth, Y Eisenberg, U Karshon, D Revel, E Ronat, A Shapira, J Freeman, P Lecomte, T Meyer, SL Wu, G Zobernig

Abstract:

We have observed τ production in e+e- annihilation at centre-of-mass energies between 12 and 31.6 GeV with cross sections in agreement with the QED τ-pair cross section. Branching ratios for τ decay have been measured and are consistent with the world averages. We have determined the cutoff parameters of QED Λ+ (Λ-) to be > 73 GeV (82 GeV) and have obtained an upper limit on the τ lifetime of 1.4 × 10-12 s(95% CL). © 1980.
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Rapid growth of charged particle multiplicity in high energy e+e- annihilations

Physics Letters B 89:3-4 (1980) 418-422

Authors:

R Brandelik, W Braunschweig, K Gather, V Kadansky, K Lübelsmeyer, P Mättig, HU Martyn, G Peise, J Rimkus, HG Sander, D Schmitz, AS von Dratzig, D Trines, W Wallraff, H Boerner, HM Fischer, H Hartmann, E Hilger, W Hillen, G Knop, P Leu, B Löhr, R Wedemeyer, N Wermes, M Wollstadt, DG Cassel, D Heyland, H Hultschig, P Joos, W Koch, P Koehler, U Kötz, H Kowalski, A Ladage, D Lüke, HL Lynch, G Mikenberg, D Notz, J Pyrlik, R Riethmüller, M Schliwa, P Söding, BH Wiik, G Wolf, R Fohrmann, M Holder, G Poelz, J Ringel, O Römer, R Rüsch, P Schmüser, DM Binnie, PJ Dornan, NA Downie, DA Garbutt, WG Jones, SL Lloyd, D Pandoulas, A Pevsner, J Sedgbeer, S Yarker, C Youngman, RJ Barlow, RJ Cashmore, J Illingworth, M Ogg, B Roe, GL Salmon, KW Bell, W Chinowsky, B Foster, JC Hart, J Proudfoot, DR Quarrie, DH Saxon, PL Woodworth, Y Eisenberg, U Karshon, D Revel, E Ronat, A Shapira, J Freeman, P Lecomte, T Meyer, Sau Lan Wu, G Zobernig

Abstract:

Hadron production by e+e- annihilation has been studied for c.m. energies W between 13 and 31.6 GeV. As a function of 1n W the charged particle multiplicity grows faster at high energy than at lower energies. This is correlated with a rise in the plateau of the rapidity distribution. The cross section sdσ/dx is found to scale within ±30% for x > 0.2 and 5 ≤ W ≤ 31.6 GeV. © 1980.
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