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Determination of the average lifetime of bottom hadrons

Physics Letters B 149:6 (1984) 524-532

Authors:

M Althoff, W Braunschweig, FJ Kirschfink, 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, R Fohrmann, 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, W Zeuner, E Hilger, T Kracht, HL Krasemann, P Leu, E Lohrmann, D Pandoulas, G Poelz, KU Pösnecker, R Beuselinck, DM Binnie, AJ Campbell, P 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, D Mellor, C Youngman, 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, A Shapira, G Baranko, A Caldwell, M Cherney, JM Izen, M Mermikides, S Ritz, G Rudolph, D Strom, M Takashima

Abstract:

We have determined the average lifetime of hadrons containing b quarks produced in e+e- annihilation to be τB = 1.83 +0.83 +0.37 - -0.34×10-12s. Our method uses charged decay products from both non-leptonic and semileptonic decay modes. © 1984.
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Measurement of the radiative width of the η′(958) in two-photon interactions

Physics Letters B 147:6 (1984) 487-492

Authors:

M Althoff, W Braunschweig, FJ Kirschfink, K Lübelsmeyer, HU Martyn, P Rosskamp, HG Sander, D Schmitz, H Siebke, W Wallraff, J Eisenmann, HM Fischer, H Hartmann, A Jocksch, G Knop, L Köpke, H Kolanoski, H Kück, V Mertens, R Wedemeyer, A Eskreys, K Gather, 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, P Dornan, B Foster, DA Garbutt, C Jenkins, TD Jones, WG Jones, J McCardle, KJ Sedgbeer, J Thomas, WAT Wan Abdullah, KW Bell, MG Bowler, P Bull, RJ Cashmore, PEL Clarke, R Devenish, P Grossmann, CM Hawkes, SL Lloyd, C Youngman, 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, A Shapira, M Winik, G Baranko, A Caldwell, M Cherney, JM Izen, M Mermikides, S Ritz, G Rudolph, D Strom

Abstract:

The reaction e+e-→e+e-η′(9 58) has been observed by detecting the final state π+π-γ. The two-photon width of the η′ has been measured to be Γ(η′→γγ) = 5.1±0.4±0.7 keV. A search for the ι(1440) has been made in the ρ{variant}0γ final state. An upper limit has been obtained for the product Γ(ι(1440) → γ)gg), B (ι→ρ{variant}0γ) < 1.5 keV (95%CL). © 1984.
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Inclusive electron production from heavy quarks in e+e- annihilation at 34.6 GeV center of mass energy

Physics Letters B 146:6 (1984) 443-449

Authors:

M Althoff, W Braunschweig, FJ Kirschfink, K Lübelsmeyer, HU Martyn, P Rosskamp, HG Sander, D Schmitz, H Siebke, W Wallraff, J Eisenmann, HM Fischer, H Hartmann, A Jocksch, G Knop, L Köpke, H Kolanoski, H Kück, V Mertens, R Wedemeyer, A Eskreys, K Gather, H Hultschig, P Joos, 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, 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, PJ Dornan, B Foster, DA Garbutt, C Jenkins, TD Jones, WG Jones, J McCardle, JK Sedgbeer, J Thomas, WATW Abdullah, KW Bell, MG Bowler, P Bull, RJ Cashmore, PEL Clarke, R Devenish, P Grossmann, CM Hawkes, SL Lloyd, C Youngman, 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, M Winik, G Baranko, T Barklow, A Caldwell, M Cherney, JM Izen, M Mermikides, S Ritz, G Rudolph

Abstract:

The production of electrons by bottom and charm hadrons has been studied in e+e- annihilation at 34.6 GeV center of mass energy. It is observed that the b quark fragmentation function is peaked at large values of the scaling variable z with 〈zb〉 = 0.84+0.15 + 0.15-0.10 - 0.11. For c quarks 〈zc〉 = 0.57+0.10 + 0.05-0.09 - 0.06 is observed. A forward-backward charge asymmetry of A = -0.25 ± 0.22 was measured in b production. © 1984.
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Photon pair production by e+e- annihilation and search for supersymmetric photinos at energies greater than 40 GeV

Zeitschrift Fur Physik C Particles and Fields 26:3 (1984) 337-342

Authors:

M Althoff, W Braunschweig, FJ Kirschfink, K Lübelsmeyer, 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, K Gather, H Hultschig, P Joos, 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, 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, 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, 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, M Winik, G Baranko, A Caldwell, M Cherney, JM Izen, M Mermikides, S Ritz, G Rudolph, D Strom

Abstract:

The cross section for the process e+e-→γγ has been measured for c.m. energies 39.5+>61 GeV and Λ+> GeV (95% confidence level) have been determined. A search for two photon final states with missing energy provided lower limits on the masses of the photino and selectron. © 1984 Springer-Verlag.
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Observation of the reaction γγ → ppπ+π-

Physics Letters B 142:1-2 (1984) 135-140

Authors:

M Althoff, W Braunschweig, FJ Kirschfink, K Lübelsmeyer, HU Martyn, J Rimkus, P Rosskamp, HG Sander, D Schmitz, H Siebke, W Wallraff, HM Fischer, H Hartmann, A Jocksch, G Knop, L Köpke, H Kolanoski, H Kück, V Mertens, R Wedemeyer, M Wollstadt, Y Eisenberg, A Eskreys, K Gather, H Hultschig, P Joos, 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, 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, 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, C Youngman, GE Forden, JC Hart, J Harvey, DK Hasell, J Proudfoot, DH Saxon, F Barreiro, M Dittmar, M Holder, G Kreutz, B Neumann, E Duchovni, U Karshon, G Mikenberg, R Mir, D Revel, E Ronat, A Shapira, G Yekutieli, G Baranko, T Barklow, A Caldwell, M Cherney, JM Izen, M Mermikides

Abstract:

Production of the ppπ+π- final state by two-photon scattering was observed. The cross section for γγ→ppπ+π- was determined assuming phase space production. No evidence was found for the production or formation of resonances. Upper limits are given for Λ and Δ pair production, for production of ppρ{variant}0 and for the two-photon excitation of cc bound states. © 1984.
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