Evidence for b baryons in Z decays

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RESEARCH PRODUCT

Evidence for b baryons in Z decays

Decamp D Deschizeaux B Goy C Lees Jp Minard Mn Alemany R Ariztizabal F Crespo Jm Delfino M Fernandez E Gaitan V Garrido L Mir Lm Pacheco A Pascual A Catanesi Mg Creanza D Depalma M Farilla A Iaselli G Maggi G Maggi M Natali S Nuzzo S Quattromini M Ranieri A Raso G Romano F Ruggieri F Selvaggi G Silvestris L Tempesta P Zito G Gao Y Hu H Huang D Huang X Lin J Lou J Qiao C Wang T Xie Y Xu D Xu R Zhang J Zhao W Atwood Wb Bauerdick Lat Bird F Blucher E Bonvicini G Bossi F Boudreau J Burnett Th Drevermann H Forty Rw Grab C Hagelberg R Haywood S Hilgart J Jost E Kasemann M Knobloch J Lacourt A Lancon E Lehraus I Lohse T Alberto Lusiani Martinez M Mato P Menary S Meyer T Minten A Miotto A Miquel R Moser Hg Nash J Palazzi P Perlas Ja Ranjard F Redlinger G Roth A Rothberg J Ruan T Saich M Schlatter D Schmelling M Tejessy W Wachsmuth H Wiedenmann W Witzeling W Wotschack J Ajaltouni Z Badaud F Bardadinotwinowska M Bencheikh Am Elfellous R Falvard A Gay P Guicheney C Henrard P Jousset J Michel B Montret Jc Pallin D Perret P Pietrzyk B Proriol J Prulhiere F Stimpfl G Hansen Jd Hansen Jr Hansen Ph Mollerud R Nilsson Bs Efthymiopoulos I Simopoulou E Vayaki A Badier J Blondel A Bonneaud G Brient Jc Fouque G Gamess A Harvey J Orteu S Rosowsky A Rouge A Rumpf M Tanaka R Videau H Candlin Dj Parsons Mi Veitch E Moneta L Parrini G Corden M Georgiopoulos C Lkeda M Lannutti J Levinthal D Mermikides M Sawyer L Wasserbaech S Antonelli A Baldini R Bencivenni G Bologna G Campana P Capon G Cerutti F Chiarella V Dettorrepiazzoli B Felici G Laurelli P Mannocchi G Murtas F Murtas Gp Passalacqua L Pepealtarelli M Picchi P Zografou P Altoon B Boyle O Colrain P Halley Aw Tenhave I Lynch Jg Maitland W Morton Wt Raine C Scarr Jm Smith K Thompson As Turnbull Rm Brandl B Braun O Geiges R Geweniger C Hanke P Hepp V Kluge Ee Maumary Y Putzer A Rensch B Stahl A Tittel K Wunsch M Belk At Beuselinck R Binnie Dm Cameron W Cattaneo M Colling Dj Dornan Pj Dugeay S Greene Am Hassard Jf Lieske Nm Patton Sj Payne Dg Phillips Mj Sedgbeer Jk Taylor G Tomalin Ir Wright Ag Girtler P Kuhn D Rudolph G Bowdery Ck Brodbeck Tj Finch Aj Foster F Hughes G Jackson D Keemer Nr Nuttall M Patel A Sloan T Snow Sw Whelan Ep Barczewski T Kleinknecht K Raab J Renk B Roehn S Sander Hg Schmidt H Steeg F Walther Sm Wolf B Aubert Jj Benchouk C Bernard V Bonissent A Carr J Coyle P Drinkard J Etienne F Papalexiou S Payre P Qian Z Rousseau D Schwernling P Talby M Adlung S Becker H Blum W Brown D Cattaneo P Cowan G Dehning B Dietl H Dydak F Fernandezbosman M Hanslkozanecka T Jahn A Lange E Lauber J Lutjens G Lutz G Manner W Pan Y Richter R Rotscheidt H Schroder J Schwarz As Settles R Stierlin U Stiegler U Stdenis R Takashima M Thomas J Wolf G Bertin V Boucrot J Callot O Chen X Cordier A Davier M Grivaz Jf Heusse P Janot P Kim Dw Lediberder F Lefrancois J Lutz Am Schune Mh Veillet Jj Videau I Zhang Z Zomer F Abbaneo D Amendolia Sr Bagliesi G Batignani G Bosisio L Bottigli U Bradaschia C Carpinelli M Ciocci Ma Dellorso R Ferrante I Fidecaro F Foa L Focardi E Forti F Gatto C Giassi A Giorgi Ma Mannelli Eb Marrocchesi Ps Messineo A Palla F Sanguinetti G Steinberger J Tenchini R Tonelli G Triggiani G Vannini C Venturi A Verdini Pg Walsh J Carter Jm Green Mg March Pv Medcalf T Quazi Is Strong Ja West Lr Wildish T Botterill Dr Clifft Rw Edgecock Tr Edwards M Fisher Sm Jones Tj Norton Pr Salmon Dp Thompson Jc Blochdevaux B Colas P Kozanecki W Locci E Loucatos S Monnier E Perez P Perrier F Rander J Renardy Jf Roussarie A Schuller Jp Schwindling J Vallage B Johnson Rp Litke Am Wear J Ashman Jg Booth Cn Buttar C Carney Re Cartwright S Combley F Dogru M Hatfield F Martin J Parker D Reeves P Thompson Lf Barberio E Brandt S Grupen C Meinhard H Mirabito L Schafer U Seywerd H Ganis G Giannini G Gobbo B Ragusa F Bellantoni L Cinabro D Conway Js Cowen Df Feng Z Ferguson Dps Gao Ys Grahl J Harton Jl Jared Rc Leclaire Bw Lishka C Pan Yb Pater Jr Saadi Y Sharma V Schmitt M Shi Zh Tang Yh Walsh Am Weber Fv Whitney Mh Wu Sl Wu X Zobernig G Ri Perrier Frederic/a 5953 2011 Antonelli Antonella/c 6238 2011 Buttar Craig/d 3706 2011 Stahl Achim/e 8846 2011 Passalacqua Luca/f 5127 2011 Murtas Fabrizio/b 5729 2012 S.t. Denis Richard/c 8997 2012 Forti Francesco/h 3035 2011 Ferrante Isidoro/f 1017 2012 Luigi Rolandi Franco Ligabue

subject

Semileptonic decay Physics Nuclear and High Energy Physics Particle physics Branching fraction Physics Electron–positron annihilation High Energy Physics::Phenomenology Hadron Nuclear physics Baryon High Energy Physics::Experiment Charm (quantum number)Nuclear Experiment Particle Physics - Experiment

description

Abstract In 160 000 hadronic Z decays recorded with the ALEPH detector at LEP, the yields of Λl− and Λl+ combinations have been measured. The observed excess of Λl− over Λl+ of 53±13 is interpreted as evidence for b baryons and their semileptonic decay. Assuming that three body decay processes such as Λ b →Λ c + l − v dominate the semileptonic decay of b baryons, this ex cess corresponds to a product branching ratio BR ( b →Λ b )· BR (Λ b →Λ c + l − v )· BR (Λ c + →ΛX) = (0.95±0.22 ( stat. )±0.21( syst. ))% , where Λb and Λc+ denote the bottom and charm baryons respectively.

year	journal	country	edition	language
1992-01-01

10.1016/0370-2693(92)90736-n http://cds.cern.ch/record/229037