CERN Accelerating science

Article
Report number hep-ex/0108007 ; CERN-EP-2001-057 ; CERN-EP-2001-057
Title Inclusive semileptonic branching ratios of b hadrons produced in Z decays
Author(s)

Heister, A. (Aachen, Tech. Hochsch.) ; Schael, S. (Aachen, Tech. Hochsch.) ; Barate, R. (Annecy, LAPP) ; De Bonis, I. (Annecy, LAPP) ; Decamp, D. (Annecy, LAPP) ; Goy, C. (Annecy, LAPP) ; Lees, J.P. (Annecy, LAPP) ; Merle, E. (Annecy, LAPP) ; Minard, M.N. (Annecy, LAPP) ; Pietrzyk, B. (Annecy, LAPP) ; Bravo, S. (Barcelona, Autonoma U.) ; Casado, M.P. (Barcelona, Autonoma U.) ; Chmeissani, M. (Barcelona, Autonoma U.) ; Crespo, J.M. (Barcelona, Autonoma U.) ; Fernandez, E. (Barcelona, Autonoma U.) ; Fernandez-Bosman, M. (Barcelona, Autonoma U.) ; Garrido, L. (Barcelona, Autonoma U.) ; Grauges, E. (Barcelona, Autonoma U.) ; Martinez, M. (Barcelona, Autonoma U.) ; Merino, G. (Barcelona, Autonoma U.) ; Miquel, R. (Barcelona, Autonoma U.) ; Mir, L.M. (Barcelona, Autonoma U.) ; Pacheco, A. (Barcelona, Autonoma U.) ; Ruiz, H. (Barcelona, Autonoma U.) ; Colaleo, A. (Bari U. ; INFN, Bari) ; Creanza, D. (Bari U. ; INFN, Bari) ; De Palma, M. (Bari U. ; INFN, Bari) ; Iaselli, G. (Bari U. ; INFN, Bari) ; Maggi, G. (Bari U. ; INFN, Bari) ; Maggi, M. (Bari U. ; INFN, Bari) ; Nuzzo, S. (Bari U. ; INFN, Bari) ; Ranieri, A. (Bari U. ; INFN, Bari) ; Raso, G. (Bari U. ; INFN, Bari ; Palermo U.) ; Ruggieri, F. (Bari U. ; INFN, Bari) ; Selvaggi, G. (Bari U. ; INFN, Bari) ; Silvestris, L. (Bari U. ; INFN, Bari) ; Tempesta, P. (Bari U. ; INFN, Bari) ; Tricomi, A. (Bari U. ; INFN, Bari ; Catania U. ; INFN, Catania) ; Zito, G. (Bari U. ; INFN, Bari) ; Huang, X. (Beijing, Inst. High Energy Phys.) ; Lin, J. (Beijing, Inst. High Energy Phys.) ; Ouyang, Q. (Beijing, Inst. High Energy Phys.) ; Wang, T. (Beijing, Inst. High Energy Phys.) ; Xie, Y. (Beijing, Inst. High Energy Phys.) ; Xu, R. (Beijing, Inst. High Energy Phys.) ; Xue, S. (Beijing, Inst. High Energy Phys.) ; Zhang, J. (Beijing, Inst. High Energy Phys.) ; Zhang, L. (Beijing, Inst. High Energy Phys.) ; Zhao, W. (Beijing, Inst. High Energy Phys.) ; Abbaneo, D. (CERN) ; Azzurri, P. (CERN) ; Boix, G. (CERN) ; Buchmuller, O. (CERN) ; Cattaneo, M. (CERN) ; Cerutti, F. (CERN) ; Clerbaux, B. (CERN) ; Dissertori, G. (CERN) ; Drevermann, H. (CERN) ; Forty, R.W. (CERN) ; Frank, M. (CERN) ; Greening, T.C. (CERN) ; Hansen, J.B. (CERN) ; Harvey, John (CERN) ; Janot, P. (CERN) ; Jost, B. (CERN) ; Kado, M. (CERN) ; Mato, P. (CERN) ; Moutoussi, A. (CERN) ; Ranjard, F. (CERN) ; Rolandi, Gigi (CERN) ; Schlatter, D. (CERN) ; Schneider, O. (CERN) ; Tejessy, W. (CERN) ; Teubert, F. (CERN) ; Tournefier, E. (CERN) ; Ward, J. (CERN) ; Ajaltouni, Z. (Clermont-Ferrand U.) ; Badaud, F. (Clermont-Ferrand U.) ; Falvard, A. (Clermont-Ferrand U.) ; Gay, P. (Clermont-Ferrand U.) ; Henrard, P. (Clermont-Ferrand U.) ; Jousset, J. (Clermont-Ferrand U.) ; Michel, B. (Clermont-Ferrand U.) ; Monteil, S. (Clermont-Ferrand U.) ; Montret, J.C. (Clermont-Ferrand U.) ; Pallin, D. (Clermont-Ferrand U.) ; Perret, P. (Clermont-Ferrand U.) ; Podlyski, F. (Clermont-Ferrand U.) ; Hansen, J.D. (Bohr Inst.) ; Hansen, J.R. (Bohr Inst.) ; Hansen, P.H. (Bohr Inst.) ; Nilsson, B.S. (Bohr Inst.) ; Waananen, A. (Bohr Inst.) ; Kyriakis, A. (Democritos Nucl. Res. Ctr.) ; Markou, C. (Democritos Nucl. Res. Ctr.) ; Simopoulou, E. (Democritos Nucl. Res. Ctr.) ; Vayaki, A. (Democritos Nucl. Res. Ctr.) ; Zachariadou, K. (Democritos Nucl. Res. Ctr.) ; Blondel, A. (Ecole Polytechnique) ; Bonneaud, G. (Ecole Polytechnique) ; Brient, J.C. (Ecole Polytechnique) ; Rouge, A. (Ecole Polytechnique) ; Rumpf, M. (Ecole Polytechnique) ; Swynghedauw, M. (Ecole Polytechnique) ; Verderi, M. (Ecole Polytechnique) ; Videau, H. (Ecole Polytechnique) ; Ciulli, V. (Florence U. ; INFN, Florence) ; Focardi, E. (Florence U. ; INFN, Florence) ; Parrini, G. (Florence U. ; INFN, Florence) ; Antonelli, A. (Frascati) ; Antonelli, M. (Frascati) ; Bencivenni, G. (Frascati) ; Bologna, G. (Frascati) ; Bossi, F. (Frascati) ; Campana, P. (Frascati) ; Capon, G. (Frascati) ; Chiarella, V. (Frascati) ; Laurelli, P. (Frascati) ; Mannocchi, G. (Frascati ; Turin, Cosmo-Geofisica Lab) ; Murtas, F. (Frascati) ; Murtas, G.P. (Frascati) ; Passalacqua, L. (Frascati) ; Pepe-Altarelli, M. (Frascati) ; Spagnolo, P. (Frascati) ; Halley, A.W. (Glasgow U.) ; Lynch, J.G. (Glasgow U.) ; Negus, P. (Glasgow U.) ; O'Shea, V. (Glasgow U.) ; Raine, C. (Glasgow U.) ; Thompson, A.S. (Glasgow U.) ; Wasserbaech, S. (Haverford Coll.) ; Cavanaugh, R. (Heidelberg U.) ; Dhamotharan, S. (Heidelberg U.) ; Geweniger, C. (Heidelberg U.) ; Hanke, P. (Heidelberg U.) ; Hansper, G. (Heidelberg U.) ; Hepp, V. (Heidelberg U.) ; Kluge, E.E. (Heidelberg U.) ; Putzer, A. (Heidelberg U.) ; Sommer, J. (Heidelberg U.) ; Tittel, K. (Heidelberg U.) ; Werner, S. (Heidelberg U.) ; Wunsch, M. (Heidelberg U.) ; Beuselinck, R. (Imperial Coll., London) ; Binnie, D.M. (Imperial Coll., London) ; Cameron, W. (Imperial Coll., London) ; Dornan, P.J. (Imperial Coll., London) ; Girone, M. (Imperial Coll., London ; CERN) ; Marinelli, N. (Imperial Coll., London) ; Sedgbeer, J.K. (Imperial Coll., London) ; Thompson, J.C. (Imperial Coll., London ; Rutherford) ; Ghete, V.M. (Innsbruck U.) ; Girtler, P. (Innsbruck U.) ; Kneringer, E. (Innsbruck U.) ; Kuhn, D. (Innsbruck U.) ; Rudolph, G. (Innsbruck U.) ; Bouhova-Thacker, E. (Lancaster U.) ; Bowdery, C.K. (Lancaster U.) ; Finch, A.J. (Lancaster U.) ; Foster, F. (Lancaster U.) ; Hughes, G. (Lancaster U.) ; Jones, R.W.L. (Lancaster U. ; CERN) ; Pearson, M.R. (Lancaster U.) ; Robertson, N.A. (Lancaster U.) ; Giehl, I. (Mainz U., Inst. Phys.) ; Jakobs, K. (Mainz U., Inst. Phys.) ; Kleinknecht, K. (Mainz U., Inst. Phys.) ; Quast, G. (Mainz U., Inst. Phys.) ; Renk, B. (Mainz U., Inst. Phys.) ; Rohne, E. (Mainz U., Inst. Phys.) ; Sander, H.G. (Mainz U., Inst. Phys.) ; Wachsmuth, H. (Mainz U., Inst. Phys.) ; Zeitnitz, C. (Mainz U., Inst. Phys.) ; Bonissent, A. (Marseille, CPPM) ; Carr, J. (Marseille, CPPM) ; Coyle, P. (Marseille, CPPM) ; Leroy, O. (Marseille, CPPM) ; Payre, P. (Marseille, CPPM) ; Rousseau, D. (Marseille, CPPM) ; Talby, M. (Marseille, CPPM) ; Aleppo, M. (Milan U. ; INFN, Milan) ; Ragusa, F. (Milan U. ; INFN, Milan) ; David, A. (Munich, Max Planck Inst.) ; Dietl, H. (Munich, Max Planck Inst.) ; Ganis, G. (Munich, Max Planck Inst.) ; Huttmann, K. (Munich, Max Planck Inst.) ; Lutjens, G. (Munich, Max Planck Inst.) ; Mannert, C. (Munich, Max Planck Inst.) ; Manner, W. (Munich, Max Planck Inst.) ; Moser, H.G. (Munich, Max Planck Inst.) ; Settles, R. (Munich, Max Planck Inst.) ; Stenzel, H. (Munich, Max Planck Inst.) ; Wiedenmann, W. (Munich, Max Planck Inst.) ; Wolf, G. (Munich, Max Planck Inst.) ; Boucrot, J. (Orsay, LAL) ; Callot, O. (Orsay, LAL) ; Davier, M. (Orsay, LAL) ; Duflot, L. (Orsay, LAL) ; Grivaz, J.F. (Orsay, LAL) ; Heusse, P. (Orsay, LAL) ; Jacholkowska, A. (Orsay, LAL) ; Lefrancois, J. (Orsay, LAL) ; Veillet, J.J. (Orsay, LAL) ; Videau, I. (Orsay, LAL) ; Yuan, C. (Orsay, LAL) ; Bagliesi, Giuseppe (Pisa U. ; INFN, Pisa ; Pisa, Scuola Normale Superiore) ; Boccali, T. (Pisa U. ; INFN, Pisa ; Pisa, Scuola Normale Superiore) ; Foa, L. (Pisa U. ; INFN, Pisa ; Pisa, Scuola Normale Superiore) ; Giammanco, A. (Pisa U. ; INFN, Pisa ; Pisa, Scuola Normale Superiore) ; Giassi, A. (Pisa U. ; INFN, Pisa ; Pisa, Scuola Normale Superiore) ; Ligabue, F. (Pisa U. ; INFN, Pisa ; Pisa, Scuola Normale Superiore) ; Messineo, A. (Pisa U. ; INFN, Pisa ; Pisa, Scuola Normale Superiore) ; Palla, F. (Pisa U. ; INFN, Pisa ; Pisa, Scuola Normale Superiore) ; Sanguinetti, G. (Pisa U. ; INFN, Pisa ; Pisa, Scuola Normale Superiore) ; Sciaba, A. (Pisa U. ; INFN, Pisa ; Pisa, Scuola Normale Superiore) ; Sguazzoni, G. (Pisa U. ; INFN, Pisa ; Pisa, Scuola Normale Superiore) ; Tenchini, R. (Pisa U. ; INFN, Pisa ; Pisa, Scuola Normale Superiore ; CERN) ; Venturi, A. (Pisa U. ; INFN, Pisa ; Pisa, Scuola Normale Superiore) ; Verdini, P.G. (Pisa U. ; INFN, Pisa ; Pisa, Scuola Normale Superiore) ; Blair, G.A. (Royal Holloway, U. of London) ; Cowan, G. (Royal Holloway, U. of London) ; Green, M.G. (Royal Holloway, U. of London) ; Medcalf, T. (Royal Holloway, U. of London) ; Misiejuk, A. (Royal Holloway, U. of London) ; Strong, J.A. (Royal Holloway, U. of London) ; Teixeira-Dias, P. (Royal Holloway, U. of London) ; Von Wimmersperg-Toeller, J.H. (Royal Holloway, U. of London) ; Clifft, R.W. (Rutherford) ; Edgecock, T.R. (Rutherford) ; Norton, P.R. (Rutherford) ; Tomalin, I.R. (Rutherford) ; Bloch-Devaux, Brigitte (DAPNIA, Saclay ; CERN) ; Colas, P. (DAPNIA, Saclay) ; Emery, S. (DAPNIA, Saclay) ; Kozanecki, W. (DAPNIA, Saclay) ; Lancon, E. (DAPNIA, Saclay) ; Lemaire, M.C. (DAPNIA, Saclay) ; Locci, E. (DAPNIA, Saclay) ; Perez, P. (DAPNIA, Saclay) ; Rander, J. (DAPNIA, Saclay) ; Renardy, J.F. (DAPNIA, Saclay) ; Roussarie, A. (DAPNIA, Saclay) ; Schuller, J.P. (DAPNIA, Saclay) ; Schwindling, J. (DAPNIA, Saclay) ; Trabelsi, A. (DAPNIA, Saclay) ; Vallage, B. (DAPNIA, Saclay) ; Konstantinidis, N. (UC, Santa Cruz) ; Litke, A.M. (UC, Santa Cruz) ; Taylor, G. (UC, Santa Cruz) ; Booth, C.N. (Sheffield U.) ; Cartwright, S. (Sheffield U.) ; Combley, F. (Sheffield U.) ; Lehto, M. (Sheffield U.) ; Thompson, L.F. (Sheffield U.) ; Affholderbach, K. (Siegen U.) ; Boehrer, Armin (Siegen U.) ; Brandt, S. (Siegen U.) ; Grupen, C. (Siegen U.) ; Ngac, A. (Siegen U.) ; Prange, G. (Siegen U.) ; Sieler, U. (Siegen U.) ; Giannini, G. (Trieste U. ; INFN, Trieste) ; Rothberg, J. (Washington U., Seattle) ; Armstrong, S.R. (Wisconsin U., Madison) ; Cranmer, K. (Wisconsin U., Madison) ; Elmer, P. (Wisconsin U., Madison) ; Ferguson, D.P.S. (Wisconsin U., Madison) ; Gao, Y. (Wisconsin U., Madison ; Tsinghua U., Beijing) ; Gonzalez, S. (Wisconsin U., Madison) ; Hayes, O.J. (Wisconsin U., Madison) ; Hu, H. (Wisconsin U., Madison) ; Jin, S. (Wisconsin U., Madison) ; Kile, J. (Wisconsin U., Madison) ; McNamara, P.A., III (Wisconsin U., Madison) ; Nielsen, J. (Wisconsin U., Madison) ; Orejudos, W. (Wisconsin U., Madison) ; Pan, Y.B. (Wisconsin U., Madison) ; Saadi, Y. (Wisconsin U., Madison) ; Scott, I.J. (Wisconsin U., Madison) ; Walsh, J. (Wisconsin U., Madison) ; Wu, Sau Lan (Wisconsin U., Madison) ; Wu, X. (Wisconsin U., Madison) ; Zobernig, G. (Wisconsin U., Madison)

Affiliation (CERN)
Publication 2002
Imprint 26 Jul 2001
Number of pages 24
Series (ALEPH Papers)
Note Revised version number 1 submitted on 2001-08-01 09:41:04
24 pages, 7 figures Report-no: CERN-EP/2001-057
In: Eur. Phys. J. C 22 (2002) 613-626
DOI 10.1007/s100520100851
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LEP ; ALEPH
Abstract A measurement of the inclusive semileptonic branching ratios of b hadrons produced in Z decay is presented, using four million hadronic events collected by the ALEPH detector from 1991 to 1995. Electrons and muons are selected opposite to b-tagged hemispheres. Two different methods are explored to distinguish the contributions from direct $\bl$ and cascade $\bcl$ dec ays to the total lepton yield. One is based on the lepton transverse momentum spectrum, the other makes use of the correlation between the charge of the lepton and charge estimators built from tracks in the opposite hemisphere of the event. The latter method reduces the dependence on the modelling of semileptonic b decays. The results obtained by averaging the two techniques are BR(b->l) = 0.1070 +- 0.0010 +- 0.0023 +- 0.0026 BR(b->c->l) = 0.0818 +- 0.0015 +- 0.0022 + 0.0022 -0.0014
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 Journalen skapades 2001-07-27, och modifierades senast 2024-08-24


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