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Charged hadron composition of the final state in e+e- annihilation at high energies

Zeitschrift für Physik C Particles and Fields 17:1 (1983) 5-15

Authors:

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

Abstract:

The inclusive production of π± and K± mesons and of protons and antiprotons in e+e- annihilation has been measured at c.m. energies of W=14, 22 and 34GeV. Using time of flight measurements and Cerenkov counters the full momentum range has been covered. Differential cross sections and total particle yields are given. At particle momenta of 0.4 GeV/c more than 90% of the charged hadrons are pions. With increasing momentum the fraction of pions among the charged hadrons decreases. At W=34 GeV and a momentum of 5 GeV/c the particle fractions are approximately π±:K±:p, {Mathematical expression}. On average an event at W=34 GeV contains 10.3±0.4π±, 2.0±0.2 K± and 0.8±0.1 p, {Mathematical expression}. In addition, we present results on baryon correlations using a sample of events where two or more protons and/or antiprotons are observed in the final state. © 1983 Springer-Verlag.
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Search for charged higgs and technipions at petra

Physics Letters B 122:1 (1983) 95-102

Authors:

M Althoff, R Brandelik, W Braunschweig, K Gather, FJ Kirschfink, K Lübelsmeyer, HU Martyn, G Peise, J Rimkus, HG Sander, D Schmitz, H Siebke, D Trines, W Wallraff, H Boerner, HM Fischer, H Hartmann, E Hilger, W Hillen, G Knop, L Köpke, H Kolanoski, H Kück, R Wedemeyer, N Wermes, M Wollstadt, H Burkhardt, S Cooper, J Franzke, H Hultschig, P Joos, W Koch, U Kötz, H Kowalski, A Ladage, B Löhr, D Lüke, P Mättig, KH Mess, D Notz, J Pyrlik, DR Quarrie, R Riethmüller, W Schütte, P Söding, G Wolf, G Yekutieli, R Fohrmann, HL Krasemann, P Leu, E Lohrmann, D Pandoulas, G Poelz, P Schmüser, BH Wiik, I Al-Agil, R Beuselinck, DM Binnie, AJ Campbell, PJ Dornan, B Foster, DA Garbutt, TD Jones, WG Jones, J McCardle, JK Sedgbeer, KW Bell, MG Bowler, IC Brock, RJ Cashmore, R Carnegie, PEL Clarke, R Devenish, P Grossmann, J Illingworth, SL Lloyd, GL Salmon, J Thomas, TR Wyatt, C Youngman, JC Hart, J Harvey, J Proudfoot, DH Saxon, PL Woodworth, D Heyland, M Holder, E Duchovni, Y Eisenberg, U Karshon, G Mikenberg, D Revel, E Ronat, A Shapira, T Barklow, M Cherney, T Meyer, G Rudolph, H Venkataramania, E Wicklund

Abstract:

We have searched for hadronic decay modes of unstable pointlike charged spin-zero particles such as charged Higgs bosons or technipions, produced in pairs in e+e- annihilation. Together with previous results on leptonic decay modes from other experiments, we conclude that at the 95% confidence level such particles do not exist in the mass range of 5 to 13 GeV. © 1983.
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Production of KK-pairs in photon-photon collisions and the excitation of the tensor meson f′(1515)

Physics Letters B 121:2-3 (1983) 216-222

Authors:

M Althoff, R Brandelik, W Braunschweig, K Gather, FJ Kirschfink, K Lübelsmeyer, HU Martyn, G Peise, J Rimkus, HG Sander, D Schmitz, H Siebke, D Trines, W Wallraff, H Boerner, HM Fischer, H Hartmann, E Hilger, W Hillen, G Knop, L Köpke, H Kolanoski, H Kück, R Wedemeyer, N Wermes, M Wollstadt, H Burkhardt, S Cooper, J Franzke, D Hochman, H Hultschig, P Joos, W Koch, U Kötz, H Kowalski, A Ladage, B Löhr, D Lüke, P Mättig, KH Mess, D Notz, J Pyrlik, DR Quarrie, R Riethmüller, W Schütte, P Söding, G Wolf, G Yekutieli, R Fohrmann, HL Krasemann, P Leu, E Lohrmann, D Pandoulas, G Poelz, P Schmüser, BH Wiik, I Al-Agil, R Beuselinck, DM Binnie, AJ Campbell, PJ Dornan, B Foster, DA Garbutt, TD Jones, WG Jones, J McCardle, JK Sedgebeer, KW Bell, MG Bowler, IC Brock, RJ Cashmore, R Carnegie, PEL Clarke, R Devenish, P Grossmann, J Illingworth, SL Lloyd, GL Salmon, J Thomas, TR Wyatt, C Youngman, JC Hart, J Harvey, J Proudfoot, DH Saxon, PL Woodworth, D Heyland, M Holder, E Duchovni, Y Eisenberg, U Karshon, G Mikenberg, D Revel, E Ronat, A Shapira, T Barklow, M Cherney, T Meyer, G Rudolph, H Venkataramania

Abstract:

We have observed exclusive production of K+K- and KSOKSO pairs and the excitation of the f′(1515) tensor meson in photon-photon collisions. Assuming the f′ to be production in a helicity 2 state, we determine Λ(f′ → γγ) B(f′ → KK) = 0.11 ± 0.02 ± 0.04 keV. The non-strange quark of the f′ is found to be less than 3% (95% CL). For the θ(1640) we derive an upper limit for the product Λ(θ rarr; γγ KK) < 0.03 keV (95% CL). © 1983.
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DSTAR+/- PRODUCTION BY E+E- ANNIHILATION NEAR 34.4 GEV CM ENERGY

PHYSICS LETTERS B 126:6 (1983) 493-498

Authors:

M ALTHOFF, W BRAUNSCHWEIG, K GATHER, FJ KIRSCHFINK, K LUBELSMEYER, HU MARTYN, G PEISE, J RIMKUS, HG SANDER, D SCHMITZ, H SIEBKE, D TRINES, W WALLRAFF, HM FISCHER, H HARTMANN, E HILGER, W HILLEN, G KNOP, L KOPKE, H KOLANOSKI, H KUCK, R WEDEMEYER, N WERMES, M WOLLSTADT, H BURKHARDT, H HULTSCHIG, P JOOS, W KOCH, U KOTZ, H KOWALSKI, A LADAGE, B LOHR, D LUKE, P MATTIG, KH MESS, D NOTZ, J PYRLIK, D QUARRIE, R RIETHMULLER, AM RUSHTON, W SCHUTTE, G WOLF, G YEKUTIELI, R FOHRMANN, HL KRASEMANN, P LEU, E LOHRMANN, D PANDOULAS, G POELZ, BH WIIK, I ALAGIL, R BEUSELINCK, DM BINNIE, AJ CAMPBELL, PJ DORNAN, B FOSTER, DA GARBUTT, TD JONES, WG JONES, J MCCARDLE, JK SEDGBEER, KW BELL, MG BOWLER, IC BROCK, RJ CASHMORE, PEL CLARKE, R DEVENISH, P GROSSMANN, SL LLOYD, GL SALMON, J THOMAS, TR WYATT, C YOUNGMAN, JC HART, J HARVEY, J PROUDFOOT, DH SAXON, PL WOODWORTH, D HEYLAND, M HOLDER, M DITTMAR, E DUCHOVNI, Y EISENBERG, D HOCHMAN, U KARSHON, G MIKENBERG, R MIR, D REVEL, E RONAT, A SHAPIRA, T BARKLOW, M CHERNEY, JM IZEN, G RUDOLPH, D STROM, H VENKATARAMANIA, E WICKLUND, SL WU, G ZOBERNIG
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Electroweak coupling constants in the leptonic reactions e+e- → e+e- and e+e- → μ+μ- and search for scalar leptons

Physics Letters B 117:5 (1982) 365-371

Authors:

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

Abstract:

A high statistics experiment was performed on Bhabha scattering at energies between 14 and 34 GeV. Good agreement with QED was observed. The combined data on Bhabha scattering and μ pair production were found to agree with the standard theory of electroweak interaction giving sin2 θ = 0.27-0.07+0.06. Assuming for the Z0 mass a value of 90 GeV the leptonic weak coupling constants were determined to gV2 = -0.04 ± 0.06 and gA2 = 0.35 ± 0.09. A search for scalar leptons sets lower limits on the mass of scalar electrons ofMse > 16.6 GeV and of scalar muons of Msμ > 16.4 GeV. © 1982.
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