Measurements of the b baryon lifetime

Buskulic, D; Casper, D; Debonis, I; Decamp, D; Ghez, P; Goy, C; Lees, J; Minard, M; Odier, P; Pietrzyk, B; Ariztizabal, F; Chmeissani, M; Crespo, J; Efthymiopoulos, I; Fernandez, E; Fernandezbosman, M; Gaitan, V; Garrido, L; Martinez, M; Orteu, S; Pacheco, A; Padilla, C; Palla, F; Pascual, A; Perlas, J; Sanchez, F; Teubert, F; Colaleo, A; Creanza, D; Depalma, M; Farilla, A; Gelao, G; Girone, M; Iaselli, G; Maggi, G; Marinelli, N; Natali, S; Nuzzo, S; Ranieri, A; Raso, G; Romano, F; Ruggieri, F; Selvaggi, G; Silvestris, L; Tempesta, P; Zito, G; Huang, X; Lin, J; Ouyang, Q; Wang, T; Xie, Y; R, X; Xue, S; Zhang, J; Zhang, L; Zhao, W; Bonvicini, G; Cassel, D; Cattaneo, M; Comas, P; Coyle, P; Drevermann, H; Engelhardt, A; Forty, R; Frank, M; Hagelberg, R; Harvey, J; Jacobsen, R; Janot, P; Jost, B; Knobloch, J; Lehraus, I; Maggi, M; Markou, C; Martin, E; Mato, P; Meinhard, H; Minten, A; Miquel, R; Oest, T; Palazzi, P; Pater, J; Pusztaszeri, J; Ranjard, F; Rensing, P; Rolandi, L; Schlatter, D; Schmelling, M; Schneider, O; Tejessy, W; Tomalin, I; Venturi, A; Wachsmuth, H; Wiedenmann, W; Wildish, T; Witzeling, W; Wotschack, J; Ajaltouni, Z; Bardadinotwinowska, M; Barres, A; Boyer, C; Falvard, A; Gay, P; Guicheney, C; Henrard, P; Jousset, J; Michel, B; Monteil, S; Montret, J; Pallin, D; Perret, P; Podlyski, F; Proriol, J; Rossignol, J; Saadi, F; Fearnley, T; Hansen, J; Hansen, J; Hansen, J; Hansen, P; Nilsson, B; Kyriakis, A; Simopoulou, E; Siotis, I; Vayaki, A; Zachariadou, K; Blondel, A; Bonneaud, G; Brient, J; Bourdon, P; Passalacqua, L; Rouge, A; Rumpf, M; Tanaka, R; Valassi, A; Verderi, M; Videau, H; Candlin, D; Parsons, M; Focardi, E; Parrini, G; Corden, M; Delfino, M; Georgiopoulos, C; Jaffe, D; Antonelli, A; Bencivenni, G; Bologna, G; Bossi, F; Campana, P; Capon, G; Chiarella, V; Felici, G; Laurelli, P; Mannocchi, G; Murtas, F; Murtas, G; Pepealtarelli, M; Dorris, S; Halley, A; Tenhave, I; Knowles, I; Lynch, J; Morton, W; Oshea, V; Raine, C; Reeves, P; Scarr, J; Smith, K; Smith, M; Thompson, A; Thomson, F; Thorn, S; Turnbull, R; Becker, U; Braun, O; Geweniger, C; Graefe, G; Hanke, P; Hepp, V; Kluge, E; Putzer, A; Rensch, B; Schmidt, M; Sommer, J; Stenzel, H; Tittel, K; Werner, S; Wunsch, M; Beuselinck, R; Binnie, D; Cameron, W; Colling, D; Dorman, P; Konstantinidis, N; Moneta, L; Moutoussi, A; Nash, J; Sanmartin, G; Sedgbeer, J; Stacey, A; Dissertori, G; Girtler, P; Kneringer, E; Kuhn, D; Rudolph, G; Bowdery, C; Brodbeck, T; Colrain, P; Crawford, G; Finch, A; Foster, F; Hughes, G; Sloan, T; Whelan, E; Williams, M; Galla, A; Greene, A; Kleinknecht, K; Quast, G; Raab, J; Renk, B; Sander, H; Wanke, R; Zeitnitz, C; Aubert, J; Bencheikh, A; Benchouk, C; Bonissent, A; Bujosa, G; Calvet, D; Carr, J; Diaconu, C; Etienne, F; Thulasidas, M; Nicod, D; Payre, P; Rousseau, D; Talby, M; Abt, L; Assmann, R; Bauer, C; Blum, W; Brown, D; Dietl, H; Dydak, F; Ganis, G; Gotzhein, C; Jakobs, K; Kroha, H; Lutjens, G; Lutz, G; Manner, W; Moser, H; Richter, R; Rosadoschlosser, A; Settles, R; Seywerd, H; Stierlin, U; Stdenis, R; Wolf, G; Alemany, R; Boucrot, J; Callot, O; Cordier, A; Courault, F; Davier, M; Duflot, L; Grivaz, J; Heusse, P; Jacquet, M; Kim, D; Lediberder, F; Lefrancois, J; Lutz, A; Musolino, G; Nikolic, I; Park, H; Park, I; Schune, M; Simion, S; Veillet, J; Videau, I; Abbaneo, D; Azzurri, P; Bagliesi, G; Batignani, G; Bettarini, S; Bozzi, C; Calderini, G; Carpinelli, M; Ciocci, M; Ciulli, V; Dellorso, R; Fantechi, R; Ferrante, I; Foa, L; Forti, F; Gambino, D; Giassi, A; Giorgi, M; Gregorio, A; Ligabue, F; Lusiani, A; Marrocchesi, P; Messineo, A; Rizzo, G; Sanguinetti, G; Sciaba, A; Spagnolo, P; Steinberger, J; Tenchini, R; Tonelli, G; Triggiani, G; Vannini, C; Verdini, P; Walsh, J; Betteridge, A; Blair, G; Bryant, L; Cerutti, F; Gao, Y; Green, M; Johnson, D; Medcalf, T; Mir, L; Perrodo, P; Strong, J; Bertin, V; Botterill, D; Clifft, R; Edgecock, T; Haywood, S; Edwards, M; Maley, P; Norton, P; Thompson, J; Blochdevaux, B; Colas, P; Duarte, H; Emery, S; Kozanecki, W; Lancon, E; Lemaire, M; Locci, E; Marx, B; Perez, P; Rander, J; Renardy, J; Rosowsky, A; Roussarie, A; Schuller, J; Schwindling, J; Simohand, D; Trabelsi, A; Vallage, B; Johnson, R; Kim, H; Litke, A; Mcneil, M; Taylor, G; Beddall, A; Booth, C; Boswell, R; Cartwright, S; Combley, F; Dawson, I; Koksal, A; Letho, M; Newton, W; Rankin, C; Thomspon, L; Bohrer, A; Brandt, S; Cowan, G; Feigl, E; Grupen, C; Lutters, G; Minguetrodriguez, J; Rivera, F; Saraiva, P; Smolik, L; Stephan, F; Apollonio, M; Bosisio, L; Dellamarina, R; Giannini, G; Gobbo, B; Ragusa, F; Rothberg, J; Wasserbaech, S; Armstrong, S; Bellantoni, L; Elmer, P; Feng, Z; Dps, F; Gao, Y; Gonzalez, S; Grahl, J; Harton, J; Hayes, O; H, H; Mcnamara, P; Nachtman, J; Orejudos, W; Pan, Y; Saadi, Y; Schmitt, M; Scott, I; Sharma, V; Turk, J; Walsh, A; Sl, W; X, W; Yamartino, J; Zheng, M; Zobernig, G

doi:10.1016/0370-2693(95)00980-Y

Using about 1.5 million hadronic Z decays recorded with the aleph detector, the lifetime of the b baryons has been measured using two independent data samples. From a maximum likelihood fit to the impact parameter distribution of leptons in 519 Λℓ- combinations containing a b baryon sample of 290 decays, the measured b baryon lifetime is τb-baryon = 1.05-0.11 +0.12(stat)±0.09(syst) ps. The lifetime of the Λb 0 baryon from a maximum likelihood fit to the proper time distribution of 58 Λc +ℓ- candidates containing a Λb 0 sample of 44 decays, is τΛ = 1.02-0.18 +0.23(stat) ± 0.06(syst) ps.

Buskulic, D., Casper, D., Debonis, I., Decamp, D., Ghez, P., Goy, C., et al. (1995). Measurements of the b baryon lifetime. PHYSICS LETTERS. SECTION B, 357(4), 685-698 [10.1016/0370-2693(95)00980-Y].