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High pT hadron production in photon-photon collisions

Physics Letters B 107:4 (1981) 290-296

Authors:

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

Abstract:

We have studied the properties of hadron production in photon-photon scattering with tagged photons at the e+e- storage ring PETRA. A tail in the pT distribution of particles consistent with pT-4 has been observed. We show that this tail cannot be due to the hadronic part of the photon. Selected events with high pT particles are found to be consistent with a two-jet structure as expected from a point-like coupling of the photons to quarks. The lowest-order cross section predicted for γγ → qq, σ = 3 Σ eq4 · σγγ → μμ, is approached from above by the data at large transverse momenta. © 1981.
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Λ, Λ production in e+e- annihilation at 33 GeV centre of mass energy

Physics Letters B 105:1 (1981) 75-80

Authors:

R Brandelik, W Braunschweig, K Gather, 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 Köpke, H Kolanoski, P Leu, R Wedemeyer, N Wermes, M Wollstadt, H Burkhardt, S Cooper, D Heyland, H Hultschig, P Joos, W Koch, U Kötz, H Kowalski, A Ladage, D Lüke, HL Lynch, P Mättig, KH Mess, D Notz, J Pyrlik, DR Quarrie, R Riethmüller, P Söding, BH Wiik, G Wolf, R Fohrmann, M Holder, HL Krasemann, G Poelz, O Römer, R Rüsch, P Schmüser, I Al-Agil, R Beuselinck, DM Binnie, AJ Campbell, PJ Dornan, DA Garbutt, TD Jones, WG Jones, SL Lloyd, D Pandoulas, JK Sedgbeer, RA Stern, S Yarker, MG Bowler, IC Brock, RJ Cashmore, R Devenish, P Grossmann, J Illingworth, M Ogg, GL Salmon, J Thomas, TR Wyatt, C Youngman, KW Bell, B Foster, JC Hart, J Proudfoot, DH Saxon, PL Woodworth, E Duchovni, Y Eisenberg, U Karshon, G Mikenberg, D Revel, E Ronat, A Shapira, T Barklow, J Freeman, P Lecomte, T Meyer, G Rudolph, E Wicklund, S Lan Wu, G Zobernig
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Partial-wave analysis of backwardly produced three-pion systems in K-p interactions at 4.2 GeV/c

Nuclear Physics, Section B 187:2 (1981) 231-253

Authors:

B Foster, P Grossmann, PR Lamb, WL McDowell, J Wells, R Blokzijl, GF Wolters, R Armenteros, C Dionisi, P Gavillet, PF Loverre, M Mazzucato, JJ Engelen, W Kittel, JSM Vergeest, RT Van De Walle

Abstract:

We report on the results of a partial-wave analysis of the 3π system produced by baryon exchange in the reaction K-p→Σ-π+π+π- at 4.2 GeV/c. We confirm the existence of an enhancement in the 1+S(ρ{variant}π) wave as previously established from a Dalitz plot analysis of the same data. The phase variation of this wave is found to be consistent with that expected for a resonance and thus the enhancement is identified with A1 production. No clear signal for this state is found in either the reaction K-p→Σ+π+π+π-π- or K-p→Λπ+π-π0. We also find production via baryon exchange of the A2 in all three reactions and the ω and ω* (1975) in the third reaction. © 1981.
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Evidence for charged primary partons in e+e- → 2 jets

Physics Letters B 100:4 (1981) 357-363

Authors:

R Brandelik, W Braunschweig, K Gather, V Kadansky, FJ Kirschfink, K Lübelsmeyer, HU Martyn, G Peise, J Rimkus, HG Sander, D Schmitz, A Schultz von Dratzig, D Trines, W Wallraff, H Boerner, HM Fischer, H Hartmann, E Hilger, W Hillen, G Knop, L Koepke, H Kolanoski, P Leu, 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, D Notz, J Pyrlik, R Riethmüller, P Söding, BH Wiik, G Wolf, R Fohrmann, M Holder, G Poelz, O Römer, R Rüsch, P Schmüser, I Al-Agil, R Beuselink, DM Binnie, PJ Dornan, DA Garbutt, WG Jones, SL Lloyd, D Pandoulas, J Sedgbeer, RA Stern, S Yarker, IC Brock, RJ Cashmore, R Devenish, P Grossmann, J Illingworth, M Ogg, GL Salmon, TR Wyatt, C Youngman, KW Bell, B Foster, JC Hart, J Proudfoot, DR Quarrie, DH Saxon, PL Woodworth, E Duchovni, Y Eisenberg, U Karshon, G Mikenberg, D Revel, E Ronat, A Shapira, T Barklow, J Freeman, P Lecomte, T Meyer, G Rudolph, E Wicklund, S Lan Wu, G Zobernig
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Search for new sequential leptons in e+e- annihilation at petra energies

Physics Letters B 99:2 (1981) 163-168

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, 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, D Notz, J Pyrlik, R Riethmüller, 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, IC Brock, RJ Cashmore, R Devenish, P Grossmann, J Illingworth, M Ogg, GL Salmon, TR Wyatt, KW Bell, B Foster, JC Hart, J Proudfoot, DR Quarrie, DH Saxon, PL Woodworth, E Duchovni, Y Eisenberg, U Karshon, G Mikenberg, D Revel, E Ronat, A Shapira, T Barklow, J Freeman, P Lecomte, T Meyer, G Rudolph, E Wicklund, S Lan Wu, G Zobernig
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