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Lambda c production from e+e- annihilation in the Upsilon energy region.

Physical review letters 55:9 (1985) 923-926

Authors:

T Bowcock, RT Giles, J Hassard, K Kinoshita, FM Pipkin, R Wilson, P Haas, M Hempstead, T Jensen, H Kagan, R Kass, S Behrends, T Gentile, JM Guida, JA Guida, F Morrow, G Parkhurst, R Poling, C Rosenfeld, EH Thorndike, P Tipton, D Besson, J Green, R Namjoshi, F Sannes, P Skubic, R Stone, D Bartoletto, A Chen, M Goldberg, N Horwitz, A Jawahery, P Lubrano, GC Moneti, CG Trahern, van Hecke H, SE Csorna, L Garren, MD Mestayer, RS Panvini, GB Word, X Yi, MS Alam, A Bean, T Ferguson, P Avery, C Bebek, K Berkelman, DG Cassel, T Copie, R DeSalvo, JW DeWire, R Ehrlich, RS Galik, MG Gilchriese, B Gittelman, SW Gray, AM Halling, DL Hartill, BK Heltsley, S Holzner, M Ito, J Kandaswamy, DL Kreinick
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Search for two-photon production of resonances decaying into K {Mathematical expression} and K {Mathematical expression}π

Zeitschrift für Physik C Particles and Fields 29:2 (1985) 189-196

Authors:

M Althoff, W Braunschweig, FJ Kirschfink, HU Martyn, R Rosskamp, H Siebke, W Wallraff, J Eisenmann, HM Fischer, H Hartmann, A Jocksch, G Knop, H Kolanoski, H Kück, V Mertens, R Wedemeyer, B Foster, A Wood, E Bernardi, Y Eisenberg, A Eskreys, K Gather, H Hultschig, P Joos, B Klima, H Kowalski, A Ladage, B Löhr, D Lüke, P Mättig, G Mikenberg, D Notz, D Revel, D Trines, T Tymieniecka, R Walczak, G Wolf, W Zeuner, E Hilger, T Kracht, HL Krasemann, E Lohrmann, G Poelz, KU Pösnecker, DM Binnie, PJ Dornan, DA Garbutt, C Jenkins, WG Jones, JK Sedgbeer, D Su, J Thomas, WAT Wan Abdullah, F Barreiro, L Labarga, E Ros, MG Bowler, P Bull, RJ Cashmore, P Dauncey, R Devenish, CM Hawkes, G Heath, DJ Mellor, SL Lloyd, KW Bell, GE Forden, JC Hart, DK Hasell, DH Saxon, S Brandt, M Dittmar, M Holder, G Kreutz, B Neumann, E Duchovni, U Karshon, A Montag, R Mir, E Ronat, G Yekutieli, A Shapira, G Baranko, A Caldwell, M Cherney, M Hildebrandt, JM Izen, M Mermikides, S Ritz, D Strom, M Takashima, H Venkataramania, E Wicklund, SL Wu, G Zobernig

Abstract:

An analysis of the production of KS0KS0 and K±Ks0π∓ by two quasi-real photons is presented. The cross section for γγ→K0 {Mathematical expression}, which is given for the γγ invariant mass range from K {Mathematical expression} threshold to 2.5 GeV, is dominated by the f′(1525) resonance and an enhancement near the K {Mathematical expression} threshold. Upper limits on the product of the two-photon width times the branching ratio into K {Mathematical expression} pairs are given for Θ(1700), h(2030), and ξ(2220). For exclusive two-photon production of K±Ks0π∓ no significant signal was observed. Upper limits are given on the cross section of γγ→K+ {Mathematical expression}π- or K-K0π+ between 1.4 and 3.2 GeV and on the product of the γγ width times the branching ratio into the K {Mathematical expression}π final states for the ηc(2980) and the ι(1440), yielding Γ(γγ)→i(1440))·BR(i(1440)→K {Mathematical expression}π<2.2 keV at 95% C.L. © 1985 Springer-Verlag.
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Search for spinless bosons in e+e- annihilation

Physics Letters B 154:2-3 (1985) 236-242

Authors:

M Althoff, W Braunschweig, FJ Kirschfink, HU Martyn, R Rosskamp, D Schmitz, H Siebke, W Wallraff, J Eisenmann, HM Fischer, H Hartmann, A Jocksch, G Knop, H Kolanoski, H Kück, V Mertens, R Wedemeyer, B Foster, A Eskreys, R Fohrmann, K Gather, H Hultschig, P Joos, B Klima, U Kötz, H Kowalski, A Ladage, B Löhr, D Lüke, P Mättig, D Notz, RJ Nowak, J Pyrlik, M Rushton, W Schütte, D Trines, T Tymieniecka, G Wolf, G Yekutieli, W Zeuner, E Hilger, T Kracht, HL Krasemann, P Leu, E Lohrmann, D Pandoulas, G Poelz, KU Pösnecker, R Beuselinck, DM Binnie, PJ Dornan, DA Garbutt, C Jenkins, TD Jones, WG Jones, J McCardle, JK Sedgbeer, J Thomas, WAT Wan Abdullah, MG Bowler, P Bull, RJ Cashmore, PEL Clarke, P Dauncey, R Devenish, P Grossmann, CM Hawkes, DJ Mellor, C Youngman, SL Lloyd, KW Bell, GE Forden, JC Hart, J Harvey, DK Hasell, DH Saxon, F Barreiro, S Brandt, M Dittmar, M Holder, G Kreutz, B Neumann, E Duchovni, Y Eisenberg, U Karshon, G Mikenberg, R Mir, D Revel, E Ronat, A Shapira, G Baranko, A Caldwell, M Cherney, JM Izen, M Mermikides, S Ritz, G Rudolph, D Strom, M Takashima, H Venkataramania

Abstract:

We have measured the cross sections for e+e- → e+e-, e+e- → μ+μ-, e+e- → γγ and e+e- → hadrons in an energy scan at center of mass energies between 39.79 and 46.72 GeV in 30 MeV steps. New spinless bosons, whose existence has been postulated as a possible means to explain the anomalously large radiative width of the Z0 found at the CERN SPS pp collider, are ruled out in the scan region. The data are used to set limits on the couplings to lepton, photon and quark pairs of bosons with masses above 46.72 GeV. © 1985.
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A study of 3-jet events in e+e- annihilation into hadrons at 34.6 GeV c.m. energy

Zeitschrift für Physik C Particles and Fields 29:1 (1985) 29-40

Authors:

M Althoff, W Braunschweig, FJ Kirschfink, HU Martyn, R Rosskamp, D Schmitz, H siebke, W Wallraff, J Eisenmann, HM Fischer, H Hartmann, J Jocksch, G Knop, H Kolanoski, H Kück, V Mertens, R Wedemeyer, B Foster, A Wood, E Bernardi, Y Eisenberg, A Eskreys, R Fohrmann, K Gather, H Hultschig, P Joos, U Karshon, B Klima, U Kötz, H Kowalski, A Ladage, B Löhr, D Lüke, P Mättig, G Mikenberg, D Notz, J Pyrlik, W Schütte, D Trines, T Tymieniecka, G Wolf, W Zeuner, E Hilger, T Kracht, HL Krasemann, E Lohrmann, D Pandoulas, G Poelz, KU Pösnecker, DM Binnie, PJ Dornan, DA Garbutt, C Jenkins, WG Jones, JK Sedgbeer, D Su, J Thomas, WAT Wan Abdullan, F Barreiro, L Labarga, E Ros, MG Bowler, P Bull, RJ Cashmore, P Dauncey, R Devenish, CM Hawkes, G Heath, DJ Mellor, SL Lloyd, KW Bell, GE Forden, JC Hart, DK Hasell, DH Saxon, S Brandt, M Dittmar, M Holder, G Kreutz, B Neumann, E Duchovni, A Montag, R Mir, D Revel, E Ronat, G Yekutieli, A Shapira, G Baranko, A Caldwell, M Cherney, M Hildebrandt, JM Izen, M Mermikides, S Ritz, G Rudolph, D Strom, M Takashima, H Venkataramania, E Wicklund, SL Wu

Abstract:

Three-jet events produced by e+e- annihilation into hadrons at 34.6 GeV c.m. energy were studied by comparing them with 2nd order QCD and two different models of fragmentation. The distribution of low energy particles in the 3-jet plane is found to be better described by the LUND color string model than by the independent jet model. The opposite is true for more energetic particles flowing between the 3 jets. The average transverse momenta in jets can be described with values of σq between 350 and 500 MeV/c for the gluon jet. © 1985 Springer-Verlag.
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The production and decay of Tau leptons in e+e- annihilation at PETRA energies

Zeitschrift für Physik C Particles and Fields 26:4 (1985) 521-530

Authors:

M Althoff, W Braunschweig, FJ Kirschfink, K Lübelsmeyer, HU Martyn, P Rosskamp, D Schmitz, H Siebke, W Wallraff, J Eisenmann, HM Fischer, H Hartmann, A Jocksch, G Knop, H Kolanoski, H Kück, V Mertens, R Wedemeyer, B Foster, A Eskreys, K Gather, M Hildebrandt, H Hultschig, P Joos, U Kötz, H Kowalski, A Ladage, B Löhr, D Lüke, P Mättig, D Notz, RJ Nowak, J Pyrlik, E Ronat, M Rushton, W Schütte, D Trines, T Tymieniecka, G Wolf, G Yekutieli, C Xiao, R Fohrmann, E Hilger, T Kracht, HL Krasemann, P Leu, E Lohrmann, D Pandoulas, G Poelz, KU Pösnecker, BH Wiik, R Beuselinck, DM Binnie, AJ Campbell, PJ Dornan, 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, P Dauncey, R Devenish, P Grossmann, CM Hawkes, SL Lloyd, DJ Mellor, C Youngman, GE Forden, JC Hart, J Harvey, DK Hasell, DH Saxon, PL Woodworth, F Barreiro, S Brandt, M Dittmar, M Holder, G Kreutz, B Neumann, E Duchovni, Y Eisenberg, U Karshon, G Mikenberg, R Mir, D Revel, A Shapira, G Baranko, A Caldwell, M Cherney, JM Izen, M Mermikides, S Ritz

Abstract:

We have observed τ pair production at average CM energies of 13.9, 22.3, 34.5 and 43.1 GeV. The cross-sections are consistent with QED, the cut off parameters being Λ+>161 GeV and Λ-169 GeV (95% CL). The topological branching fraction of the τ to 1 charged particle, B1, is 0.847±0.011 (stat)-0.013+0.016(syst) and no decays to 5 charged particles were observed resulting in B5<0.007 (95% CL). Within the 3 charged track final state B(τ-→π-π+π- v)/(B(τ-→π- π+π- v)+B(τ-→π-π+π -π0v))=0.37-0.20+0.35 © 1985 Springer-Verlag.
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