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Experimental study of jet masses in e+e- annihilation at c.m. energies between 12 and 43.5 GeV

Zeitschrift Fur Physik C Particles and Fields 45:1 (1989) 11-23

Authors:

W Braunschweig, R Gerhards, FJ Kirschfink, HU Martyn, HM Fischer, H Hartmann, J Hartmann, E Hilger, A Jocksch, R Wedemeyer, B Foster, AJ Martin, F Barreiro, E Bernardi, J Chwastowski, K Genser, H Kowalski, B Löhr, D Lüke, D Notz, JM Pawlak, KU Pösnecker, E Ros, R Walczak, G Wolf, H Kolanoski, T Kracht, J Krüger, E Lohrmann, G Poelz, W Zeuner, A Hassard, J Shulman, D Su, I Tomalin, A Leites, J del Peso, L Hervas, M Traseira, MG Bowler, PN Burrows, RJ Cashmore, GP Heath, ME Veitch, JC Hart, DH Saxon, S Brandt, M Holder, L Labarga, Y Eisenberg, U Karshon, G Mikenberg, A Montag, D Revel, E Ronat, AN Wainer, G Yekutieli, D Muller, S Ritz, M Takashima, SL Wu, G Zobernig, A Caldwell

Abstract:

Data on jet masses, resulting from the decomposition of e+e- hadronic final states into two hemispheres, are presented at centre of mass energies between 12 and 43.5 GeV. Comparisons are made with bare O(αs2) QCD predictions as well as with QCD based fragmentation models. Values for αs and {Mathematical expression} are determined, both with and without hadronization effects included. Upper and lower limits for {Mathematical expression} independent of fragmentation models have been determined to be 0.480±0.025 GeV and 0.047±0.007 GeV respectively. © 1989 Springer-Verlag.
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Observation of the Charmed Strange Baryon Ξc0

Physical Review Letters American Physical Society (APS) 62:8 (1989) 863-865

Authors:

P Avery, D Besson, L Garren, J Yelton, T Bowcock, K Kinoshita, FM Pipkin, M Procario, Richard Wilson, J Wolinski, D Xiao, A Jawahery, CH Park, R Poling, R Fulton, P Haas, M Hempstead, T Jensen, DR Johnson, H Kagan, R Kass, F Morrow, J Whitmore, P Baringer, RL McIlwain, DH Miller, CR Ng, EI Shibata, W-M Yao, D Bortoletto, M Goldberg, N Horwitz, P Lubrano, MD Mestayer, GC Moneti, V Sharma, IPJ Shipsey, T Skwarnicki, SE Csorna, T Letson, MS Alam, D Chen, N Katayama, IJ Kim, WC Li, XC Lou, CR Sun, V Tanikella, IC Brock, T Ferguson, M Artuso, C Bebek, K Berkelman, E Blucher, J Byrd, DG Cassel, E Cheu, DM Coffman, T Copie, G Crawford, R DeSalvo, JW DeWire, P Drell, R Ehrlich, RS Galik, B Gittelman, SW Gray, AM Halling, DL Hartill, BK Heltsley, J Kandaswamy, R Kowalewski, DL Kreinick, Y Kubota, JD Lewis, NB Mistry, J Mueller, R Namjoshi, S Nandi, E Nordberg, C O'Grady, D Perticone, D Peterson, M Pisharody, D Riley, M Sapper, A Silverman, S Stone, H Worden, M Worris, AJ Sadoff
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Search for the Charmless Decays B→pp¯π and pp¯ππ

Physical Review Letters American Physical Society (APS) 62:1 (1989) 8-11

Authors:

C Bebek, K Berkelman, E Blucher, J Byrd, DG Cassel, E Cheu, DM Coffman, T Copie, G Crawford, R DeSalvo, JW DeWire, P Drell, R Ehrlich, RS Galik, B Gittelman, SW Gray, AM Halling, DL Hartill, BK Heltsley, J Kandaswamy, R Kowalewski, DL Kreinick, Y Kubota, JD Lewis, NB Mistry, J Mueller, R Namjoshi, S Nandi, E Nordberg, C O'Grady, D Perticone, D Peterson, M Pisharody, D Riley, M Sapper, A Silverman, S Stone, H Worden, M Worris, AJ Sadoff, P Avery, D Besson, L Garren, J Yelton, T Bowcock, K Kinoshita, FM Pipkin, M Procario, Richard Wilson, J Wolinski, D Xiao, A Jawahery, CH Park, R Poling, R Fulton, P Haas, M Hempstead, T Jensen, DR Johnson, H Kagan, R Kass, F Morrow, J Whitmore, P Baringer, RL McIlwain, DH Miller, R Ng, EI Shibata, MS Alam, D Chen, N Katayama, IJ Kim, WC Li, XC Lou, CR Sun, V Tanikella, D Bortoletto, M Goldberg, R Holmes, N Horwitz, P Lubrano, MD Mestayer, GC Moneti, V Sharma, IPJ Shipsey, T Skwarnicki, SE Csorna, T Letson, IC Brock, T Ferguson, H Vogel
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A study of jets from b quarks produced in e+e- annihilations at {Mathematical expression} GeV

Zeitschrift Fur Physik C Particles and Fields 42:1 (1989) 17-31

Authors:

W Braunschweig, R Gerhards, FJ Kirschfink, HU Martyn, B Bock, HM Fischer, H Hartmann, J Hartmann, E Hilger, A Jocksch, R Wedemeyer, B Foster, AJ Martin, AJ Sephton, E Bernardi, J Chwastowski, A Eskreys, K Gather, K Genser, H Hultschig, P Joos, H Kowalski, A Ladage, B Löhr, D Lüke, P Mattig, D Notz, J Pawlak, KU Pösnecker, E Ros, W Schütte, D Trines, R Walczak, G Wolf, H Kolanoski, T Kracht, J Krüger, E Lohrmann, G Poelz, W Zeuner, AT Belk, DM Binnie, JF Hassard, J Shulman, D Su, F Barreiro, A Leites, J del Peso, C Balkwill, MG Bowler, PN Burrows, RJ Cashmore, GP Heath, P Ratoff, IM Silvester, I Tomalin, ME Veitch, JM Yelton, SL Lloyd, GE Forden, JC Hart, DH Saxon, S Brandt, M Holder, L Labarga, Y Eisenberg, U Karshon, G Mikenberg, A Montag, D Revel, E Ronat, A Shapira, N Wainer, G Yekutieli, D Muller, S Ritz, D Strom, M Takashima, SL Wu, G Zobernig

Abstract:

A b enrichment technique using the long B lifetime has been developed, by which ∼600 hadronic events with >65%b purity are obtained. The properties of the associated jets are studied, with comparisons made between them and those in hadronic data in which b quarks make up only 10% of the total, and jets in Monte Carlo events. The distributions in rapidity and multiplicity yield two new determinations of the fragmentation variable z for b hadrons and confirm that the b fragmentation function is hard. We also present the first measurement of the relative strength of the strong interaction coupling of the b quark compared with the average of all flavours. © 1989 Springer-Verlag.
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Charged multiplicity distributions and correlations in e+e- annihilation at PETRA energies

Zeitschrift Fur Physik C Particles and Fields 45:2 (1989) 193-208

Authors:

W Braunschweig, R Gerhards, FJ Kirschfink, HU Martyn, HM Fischer, H Hartmann, J Hartmann, E Hilger, A Jocksch, R Wedemeyer, B Foster, AJ Martin, E Bernardi, J Chwastowski, A Eskreys, K Gather, K Genser, H Hultschig, P Joos, H Kowalski, A Ladage, B Löhr, D Lüke, P Mättig, D Notz, JM Pawlak, KU Pösnecker, E Ros, D Trines, R Walczak, G Wolf, H Kolanoski, T Kracht, J Krüger, E Lohrmann, G Poelz, W Zeuner, J Hassard, J Shulman, D Su, F Barreiro, A Leites, J del Peso, MG Bowler, PN Burrows, ME Veitch, GE Forden, JC Hart, DH Saxon, S Brandt, M Holder, Y Eisenberg, U Karshon, G Mikenberg, A Montag, D Revel, E Ronat, A Shapira, N Wainer, G Yekutieli, A Caldwell, D Muller, S Ritz, D Strom, M Takashima, SL Wu, G Zobernig

Abstract:

We report on an analysis of the multiplicity distributions of charged particles produced in e+e- annihilation into hadrons at c.m. energies between 14 and 46.8 GeV. The charged multiplicity distributions of the whole event and single hemisphere deviate significantly from the Poisson distribution but follow approximate KNO scaling. We have also studied the multiplicity distributions in various rapidity intervals and found that they can be well described by the negative binomial distribution only for small central intervals. We have also analysed forward-backward multiplicity correlations for different energies and selections of particle charge and shown that they can be understood in terms of the fragmentation properties of the different quark flavours and by the production and decay of resonances. These correlations are well reproduced by the Lund string model. © 1989 Springer-Verlag.
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