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Observation of hard processes in collisions of two quasi-real photons

Physics Letters B 138:1-3 (1984) 219-224

Authors:

M Althoff, W Braunschweig, FJ Kirschfink, K Lübelsmeyer, HU Martyn, G Peise, J Rimkus, P Rosskamp, HG Sander, D Schmitz, H Siebke, W Wallraff, HM Fischer, H Hartmann, W Hillen, A Jocksch, G Knop, L Köpke, H Kolanoski, H Kück, V Mertens, R Wedemeyer, N Wermes, M Wollstadt, Y Eisenberg, K Gather, H Hultschig, P Joos, W Koch, U Kötz, H Kowalsi, A Ladage, B Löhr, D Lüke, P Mättig, D Notz, RJ Nowak, J Pyrlik, DR Quarrie, M Rushton, W Schütte, D Trines, G Wolf, C Xiao, R Fohrmann, E Hilger, T Kracht, HL Krasemann, P Leu, E Lohrmann, D Pandoulas, G Poelz, BH Wiik, R Beuselinck, DM Binnie, AL Campbell, PJ Dornan, B Foster, DA Garbutt, C Jenkins, TD Jones, WG Jones, J McCardle, JK Sedgbeer, J Thomas, WAT Wan Abdullah, KW Bell, MG Bowler, P Bull, RJ Cashmore, PEL Clarke, R Devenish, P Grossmann, CM Hawkes, SL Lloyd, GL Salmon, TR Wyatt, C Youngman, GE Forden, JC Hart, J Harvey, DK Hasell, J Proudfoot, DH Saxon, PL Woodworth, F Barreiro, M Dittmar, M Holder, B Neumann, E Duchovni, U Karshon, G Mikenberg, R Mir, D Revel, E Ronat, A Shapira, G Yekutieli, T Barklow, A Caldwell, M Cherney

Abstract:

Hard processes in photon-photon collisions are studied using high statistics data without requiring an electron tag. A high yield of hadrons with pt in the range 1.5-3.0 GeV/c is observed. This yield exceeds the expectation of the Born term by a factor of four. © 1984.
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On the measurement of sin2θw at HERA

Nuclear Physics B Elsevier 233:3 (1984) 365-374
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Observation of F meson production in high energy e+e- annihilation

Physics Letters B 136:1-2 (1984) 130-134

Authors:

M Althoff, W Braunschweig, FJ Kirschfink, K Lübelsmeyer, HU Martyn, G Peise, J Rimkus, P Rosskamp, HG Sander, D Schmitz, H Siebke, W Wallraff, HM Fischer, H Hartmann, W Hillen, A Jocksch, G Knop, L Köpke, H Kolanoski, H Kück, V Mertens, R Wedemeyer, N Wermes, M Wollstadt, Y Eisenberg, K Gather, H Hultschig, P Joos, W Koch, U Kötz, H Kowalski, A Ladage, B Löhr, D Lüke, P Mättig, D Notz, RJ Nowak, J Pyrlik, DR Quarrie, M Rushton, W Schütte, D Trines, G Wolf, C Xiao, R Fohrmann, E Hilger, T Kracht, HL Krasemann, P Leu, E Lohrmann, D Pandoulas, G Poelz, BH Wiik, R Beuselinck, DM Binnie, AJ Campbell, PJ Dornan, B Foster, DA Garbutt, C Jenkins, TD Jones, WG Jones, J McCardle, JK Sedgbeer, J Thomas, WAT Wan Abdullah, KW Bell, MG Bowler, P Bull, RJ Cashmore, PEL Clarke, R Devenish, P Grossmann, CM Hawkes, SL Lloyd, GL Salmon, TR Wyatt, C Youngman, GE Forden, JC Hart, J Harvey, DK Hasell, J Proudfoot, DH Saxon, PL Woodworth, F Barreiro, M Dittmar, M Holder, B Neumann, E Duchovni, U Karshon, G Mikenberg, R Mir, D Revel, E Ronat, A Shapira, G Yekutieli, G Baranko, T Barklow, A Caldwell

Abstract:

Production of the F meson by e+e- annihilation at high energies has been obsrved in the φ{symbol}π final state with a mass of 1.975 ± 0.009 ± 0.010 GeV and a width consistent with the mass resolution. The yield of F production times branching ratio relative to μ pair production is RF(x ≥ 0.3) B (F± → φ{symbol}π±) = 0.061 ± 0.012 ± 0.018. © 1984.
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Properties of charm jets produced in e+e- annihilation near 34 GeV

Physics Letters B 135:1-3 (1984) 243-249

Authors:

M Althoff, W Braunschweig, FJ Kirschfink, K Lübelsmeyer, HU Martyn, G Peise, J Rimkus, P Rosskamp, HG Sander, D Schmitz, H Siebke, W Wallraff, HM Fischer, H Hartmann, W Hillen, A Jocksch, G Knop, L Köpke, H Kolanoski, H Kück, R Wedemeyer, N Wermes, M Wollstadt, Y Eisenberg, K Gather, H Hultschig, P Joos, W Koch, U Kötz, H Kowalski, A Ladage, B Löhr, D Lüke, P Mättig, D Notz, RJ Nowak, J Pyrlik, DR Quarrie, M Rushton, W Schütte, D Trines, G Wolf, C Xiao, R Fohrmann, E Hilger, T Kracht, HL Krasemann, P Leu, E Lohrmann, D Pandoulas, G Poelz, BH Wiik, R Beuselinck, DM Binnie, AL Campbell, PJ Dornan, B Foster, DA Garbutt, C Jenkins, TD Jones, WG Jones, J McCardle, JK Sedgbeer, J Thomas, WAT Wan Abdullah, KW Bell, MG Bowler, P Bull, RJ Cashmore, PEL Clarke, R Devenish, P Grossmann, CM Hawkes, SL Lloyd, GL Salmon, TR Wyatt, C Youngman, GE Forden, JC Hart, J Harvey, DK Hasell, J Proudfoot, DH Saxon, PL Woodworth, F Barreiro, M Dittmar, M Holder, B Neumann, E Duchovni, U Karshon, G Mikenberg, R Mir, D Revel, E Ronat, A Shapira, G Yekutieli, T Barklow, A Caldwell, M Cherney, JM Izen

Abstract:

D*± production via e+e- → D*±X was studied at CM energies near 34 GeV. The charged particles produced in the hemisphere opposite to that of the D* were used to investigate the fragmentation of charm jets. All spectra studied show a close similarity between the charm jet and the average jet obtained by summing over all quark flavours. The spectra of particles produced in the D* hemisphere were used to study separately first rank and higher rank fragmentation. © 1984.
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Production and muonic decay of heavy quarks in e+e- annihilation at 34.5 GeV

Zeitschrift Fur Physik C Particles and Fields 22:3 (1984) 219-229

Authors:

M Althoff, W Braunschweig, FJ Kirschfink, K Lübelsmeyer, HU Martyn, G Peise, J Rimkus, P Rosskamp, HG Sander, D Schmitz, H Siebke, W Wallraff, HM Fischer, H Hartmann, W Hillen, W Jocksch, G Knop, L Köpke, H Kolanoski, H Kück, R Wedemeyer, N Wermes, M Wollstadt, Y Eisenberg, K Gather, H Hultschig, P Joos, W Koch, U Kötz, H Kowalski, A Ladage, B Löhr, D Lüke, P Mättig, D Notz, RJ Nowak, J Pyrlik, DR Quarrie, M Rushton, W Schütte, D Trines, G Wolf, C Xiao, R Fohrmann, E Hilger, T Kracht, HL Krasemann, P Leu, E Lohrmann, D Pandoulas, G Poelz, BH Wiik, R Beuselinck, DM Binnie, AL Campbell, PJ Dornan, B Foster, DA Garbutt, C Jenkins, TD Jones, WG Jones, J McCardle, JK Sedgbeer, WATW Abdullah, KW Bell, MG Bowler, P Bull, RJ Cashmore, PEL Clarke, R Devenish, P Grossmann, CM Hawkes, SL Lloyd, GL Salmon, J Thomas, TR Wyatt, C Youngman, GE Forden, JC Hart, J Harvey, DK Hasell, J Proudfoot, DH Saxon, PL Woodworth, F Barreiro, M Dittmar, M Holder, B Neumann, E Duchovni, U Karshon, G Mikenberg, R Mir, D Revel, D Ronat, A Shapira, G Yekutieli, T Barklow, A Caldwell, M Cherney, JM Izen

Abstract:

The production of prompt muons in e+e- annihilation has been studied at centre of mass energies near 34.5 GeV. The measured semi-muonic branching ratios of b and c quarks are B(b»Xμv) =0.117±0.028±0.01 and B(c→Xμv)=0.082 ±0.012a-0.01 +0.02. The fragmentation functions of heavy quarks are hard, b>=0.85a-0.12-0.07 +0.10+0.02 and c> =0.77a-0.07-0.11 +0.05+0.03. Limits have been set on flavour changing neutral current decays:B(b→Xμ+μ-) <0.02 and B(b→Xμ+μ- (95% confidence level). © 1984 Springer-Verlag.
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