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Measurements of $BR(b \to \tau ^{-}\overline{\nu}_{\tau}X)$ and $BR(b \to \tau ^{-}\overline{\nu}_{\tau} D^{*\pm}X)$ and Upper Limits on $BR(B^{-} \to \tau^{-}\overline{\nu}_\tau)$ and $BR(b \to s\nu\overline{\nu})$

R. Barate 1 D. Decamp 1 P. Ghez 1 C. Goy 1 J P. Lees 1 E. Merle 1 M N. Minard 1 P. Perrodo 1 B. Pietrzyk 1 S. Bravo M P. Casado M. Chmeissani J M. Crespo E. Fernandez M. Fernandez-Bosman L. Garrido E. Grauges M. Martinez G. Merino R. Miquel L M. Mir A. Pacheco A. Pascual H. Ruiz A. Colaleo D. Creanza M. de Palma G. Iaselli G. Maggi M. Maggi S. Nuzzo A. Ranieri G. Raso F. Ruggieri G. Selvaggi L. Silvestris P. Tempesta A. Tricomi G. Zito X. Huang Jiali Lin Q. Ouyang T. Wang Y. Xie R. Xu S. Xue J. Zhang L. Zhang W. Zhao D. Abbaneo G. Boix O. Buchmuller M. Cattaneo F. Cerutti G. Dissertori H. Drevermann R W. Forty M. Frank T C. Greening J B. Hansen J. Harvey P. Janot B. Jost I. Lehraus P. Mato A. Minten A. Moutoussi F. Ranjard L. Rolandi D. Schlatter M. Schmitt O. Schneider P. Spagnolo W. Tejessy F. Teubert E. Tournefier a E. Wright Ziad Ajaltouni 2 F. Badaud 2 G. Chazelle 2 O. Deschamps 2 Alain Falvard 2 Pascal Gay 2 C. Guicheney 2 Pierre Henrard 2 J. Jousset 2 B. Michel 2 S. Monteil 2 Jean-Claude Montret 2 D. Pallin 2 Pascal Perret 2 F. Podlyski 2 J D. Hansen J R. Hansen P H. Hansen B S. Nilsson A. Waananen G. Daskalakis A. Kyriakis C. Markou E. Simopoulou A. Vayaki A. Blondel 3 G. Bonneaud 3 J C. Brient 3 A. Rouge 3 M. Rumpf 3 M. Swynghedauw 3 M. Verderi 3 H. Videau 3 E. Focardi G. Parrini K. Zachariadou A. Antonelli M. Antonelli G. Bencivenni G. Bologna F. Bossi P. Campana G. Capon V. Chiarella P. Laurelli G. Mannocchi F. Murtas G P. Murtas L. Passalacqua M. Pepe-Altarelli a W. Halley J G. Lynch P. Negus V. O'Shea C. Raine P. Teixeira-Dias a S. Thompson R. Cavanaugh S. Dhamotharan C. Geweniger P. Hanke G. Hansper V. Hepp E E. Kluge A. Putzer J. Sommer K. Tittel S. Werner M. Wunsch R. Beuselinck D M. Binnie W. Cameron P J. Dornan M. Girone N. Marinelli J K. Sedgbeer J C. Thompson E. Thomson V M. Ghete P. Girtler E. Kneringer D. Kuhn G. Rudolph C K. Bowdery P G. Buck a J. Finch F. Foster G. Hughes R W L. Jones N A. Robertson I. Giehl K. Jakobs K. Kleinknecht G. Quast B. Renk E. Rohne H G. Sander H. Wachsmuth C. Zeitnitz A. Bonissent 4 J. Carr 4 P. Coyle 4 O. Leroy 4 P. Payre 4 D. Rousseau 4 M. Talby 4 M. Aleppo F. Ragusa H. Dietl G. Ganis A. Heister K. Huttmann G. Lutjens C. Mannert W. Manner H G. Moser S. Schael R. Settles H. Stenzel W. Wiedenmann G. Wolf P. Azzurri J. Boucrot 5 O. Callot 5 S. Chen 5 A. Cordier 5 M. Davier 5 L. Duflot 5 J F. Grivaz 5 P. Heusse 5 A. Jacholkowska 5 F. Le Diberder 5 J. Lefrancois 5 a M. Lutz 5 M H. Schune 5 J J. Veillet 5 I. Videau 5 C. Yuan 5 D. Zerwas 5 G. Bagliesi T. Boccali G. Calderini V. Ciulli L. Foa A. Giassi F. Ligabue A. Messineo F. Palla G. Sanguinetti A. Sciaba G. Sguazzoni R. Tenchini A. Venturi P G. Verdini G A. Blair G. Cowan M G. Green T. Medcalf J A. Strong J H. von Wimmersperg-Toller R W. Clifft T R. Edgecock P R. Norton I R. Tomalin B. Bloch-Devaux P. Colas S. Emery W. Kozanecki E. Lancon M C. Lemaire E. Locci P. Perez J. Rander J F. Renardy A. Roussarie J P. Schuller J. Schwindling A. Trabelsi B. Vallage S N. Black J H. Dann R P. Johnson H Y. Kim N P. Konstantinidis a M. Litke M A. Mcneil G. Taylor C N. Booth S. Cartwright F. Combley M H. Lehto L F. Thompson K. Affholderbach A. Bohrer S. Brandt C. Grupen A. Misiejuk G. Prange U. Sieler G. Giannini B. Gobbo J E. Rothberg S. Wasserbaech S R. Armstrong K. Cranmer P. Elmer D P S. Ferguson Y. Gao S. Gonzalez O J. Hayes H. Hu S. Jin J. Kile P A. Mcnamara J. Nielsen W. Orejudos y B. Pan Y. Saadi I J. Scott J. Walsh S L. Wu X. Wu G. Zobernig
Abstract : Inclusive branching ratios involving b to tau transitions are measured in approximately four million hadronic Z decays collected by the ALEPH detector at LEP. The fully-inclusive branching ratio b -> tau nu X and the semi-inclusive branching ratio b -> tau nu D*+/- X are measured to be (2.43 +/- 0.20 +/- 0.25)% and (0.88 +/- 0.31 +/- 0.28)%, in agreement with the standard model predictions. Upper limits on the branching fractions b -> tau nu and b -> s nu nubar are set to 8.3 10**-4 and 6.4 10**-4 at the 90\%~C.L. These results allow a 90\% C.L. lower limit of 0.40 (GeV/c**2)**-1 to be set on the tan(beta)/mH+/- ratio, in the framework of type-II two-Higgs-doublet models.
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Submitted on : Tuesday, May 15, 2001 - 6:19:07 PM
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R. Barate, D. Decamp, P. Ghez, C. Goy, J P. Lees, et al.. Measurements of $BR(b \to \tau ^{-}\overline{\nu}_{\tau}X)$ and $BR(b \to \tau ^{-}\overline{\nu}_{\tau} D^{*\pm}X)$ and Upper Limits on $BR(B^{-} \to \tau^{-}\overline{\nu}_\tau)$ and $BR(b \to s\nu\overline{\nu})$. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2001, 19, pp.213-227. ⟨in2p3-00007914⟩

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