1. Measuremént of the b baryon lifetime and branching fractions in Z decays
- Author
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Barate, R., Buskulic, D., Decamp, D., Ghez, P., Goy, G., Lees, J. P., Lucotte, A., Minard, M. N., Nief, J. Y., Pietrzyk, B., Casado, M. P., Chmeissani, M., Comas, P., Crespo, J. M., Delfino, M., Fernandez, E., Fernandez Bosman, M., Garrido, L., Juste, A., Martinez, M., Merino, G., Miquel, R., Mir, L. M., Padilla, C., Park, I. C., Pascual, A., Perlas, J. A., Riu, I., Sanchez, F., Colaleo, A., Creanza, D., Palma, M. d., Gelao, G., Iaselli, G., Maggi, G., Maggi, M., Marinelli, N., Nuzzo, S., Ranieri, A., Raso, G., Ruggieri, F., Selvaggi, G., Silvestris, L., Tempesta, P., Tricomi, A., Zito, G., Huang, X., Lin, J., Ouyang, Q., Wang, T., Xie, Y., Xu, R., Xue, S., Zhang, J., Zhang, L., Zhao, W., Abbaneo, D., Alemany, R., Becker, U., Bazarko, A. O., Bright Thomas, P., Cattaneo, M., Cerutti, F., Dissertori, G., Drevermann, H., Forty, R. W., Frank, M., Hagelberg, R., Hansen, J. B., Harvey, J., Janot, P., Jost, B., Kneringer, E., Knobloch, J., Lehraus, I., Mato, P., Minten, A., Moneta, L., Pacheco, A., Pusztaszeri, J. F., Ranjard, F., Rizzo, G., Rolandi, L., Rousseau, D., Schlatter, D., Schmitt, M., Schneider, O., Tejessy, W., Teubert, F., Tomalin, I. R., Wachsmuth, H., Wagner, A., Ajaltouni, Z., Barres, A., Boyer, C., Falvard, A., Ferdi, C., Gay, P., Guicheney, C., Henrard, P., Jousset, J., Michel, B., Monteil, S., Montret, J. C., Pallin, D., Perret, P., Podlyski, F., Proriol, J., Rosnet, P., Rossignol, J. M., Fearnley, T., Hansen, J. D., Hansen, J. R., Hansen, P. H., Nilsson, B. S., Rensch, B., Waananen, A., Daskalakis, G., Kyriakis, A., Markou, C., Simopoulou, E., Siotis, I., Vayaki, A., Blondel, A., Bonneaud, G., Brient, J. C., Bourdon, P., Rouge, A., Rumpf, M., Valassi, A., Verderi, M., Videau, H., Candlin, D. J., Parsons, M. I., Focardi, E., Parrini, G., Zachariadou, K., Corden, M., Georgiopoulos, C., Jaffe, D. E., Antonelli, A., Bencivenni, G., Bologna, G., Bossi, F., Campana, P., Capon, G., Casper, D., Chiarella, V., Felici, G., Laurelli, P., Mannocchi, G., Murtas, F., Murtas, G. P., Passalacqua, L., Pepe Altarelli, M., Curtis, L., Dorris, S. J., Halley, A. W., Knowles, I. G., Lynch, J. G., O'Shea, V., Raine, C., Scarr, J. M., Smith, K., Teixeira Dias, P., Thompson, A. S., Thomson, E., Thomson, F., Turnbull, R. M., Buchmuller, O., Dhamotharan, S., Geweniger, C., Graefe, G., Hanke, P., Hansper, G., Hepp, V., Kluge, E. E., Putzer, A., Sommer, J., Tittel, K., Werner, S., Wunsch, M., Beuselinck, R., Binnie, D. M., Cameron, W., Dornan, P. J., Girone, M., Goodsir, S., Martin, E. B., Moutoussi, A., Nash, J., Sedgbeer, J. K., Spagnolo, P., Stacey, A. M., Williams, M. D., Ghete, V. M., Girtler, P., Kuhn, D., Rudolph, G., Betteridge, A. P., Bowdery, C. K., Buck, P. G., Colrain, P., Crawford, G., Finch, A. J., Foster, F., Hughes, G., R. W. L., Sloan, T., Williams, M. I., Giehl, I., Greene, A. M., Hoffmann, C., Jakobs, K., Kleinknecht, K., Quast, G., Renk, B., Rohne, E., Sander, H. G., Gemmeren, P. v., Zeitnitz, C., Aubert, J. J., Benchouk, C., Bonissent, A., Bujosa, G., Carr, J., Coyle, P., Diaconu, C., Etienne, F., Konstantinidis, N., Leroy, O., Motsch, F., Payre, P., Talby, M., Sadouki, A., Thulasidas, M., Trabelsi, K., Aleppo, M., Antonelli, M., Ragusa, F., Berlich, R., Blum, W., Buscher, V., Dietl, H., Ganis, G., Gotzhein, C., Kroha, H., Lutjens, G., Lutz, G., Manner, W., Moser, H. G., Richter, R., Rosado Schlosser, A., Schael, S., Settles, R., Seywerd, H., Denis, R. S., Stenzel, H., Wiedenmann, W., Wolf, G., Boucrot, J., Callot, O., Chen, S., Choi, Y., Cordier, A., Davier, M., Duflot, L., Grivaz, J. F., Heusse, P., Hocker, A., Jacholkowska, A., Jacquet, M., Kim, D. W., Diberder, F. L., Lefrancois, J., Lutz, A. M., Nikolic, I., Schune, M. H., Simion, S., Tournefier, E., Veillet, J. J., Videau, I., Zerwas, D., Azzurri, P., Bagliesi, G., Batignani, G., Bettarini, S., Bozzi, C., Calderini, G., Carpinelli, M., Ciocci, MARIA AGNESE, Ciulli, V., Dell'Orso, R., Fantechi, N., Ferrante, I., Foa, L., Forti, F., Giassi, A., Giorgi, M. A., Gregorio, A., Ligabue, F., Lusiani, A., Marrocchesi, PIER SIMONE, Messineo, A., Palla, F., Sanguinetti, G., Sciaba, A., Steinberger, J., Tenchini, R., Tonelli, G., Vannini, C., Venturi, A., Verdini, P. G., Blair, G. A., Bryant, L. M., Chambers, J. T., Gao, Y., Green, M. G., Medcalf, T., Perrodo, P., Strong, J. A., Von, J. H., Botterill, D. R., Clifft, R. W., Edgecock, T. R., Haywood, S., Norton, P. R., Thompson, J. C., Wright, A. E., Bloch Devaux, B., Colas, P., Emery, S., Kozanecki, W., Lancon, E., Lemaire, M. C., Locci, E., Perez, P., Rander, J., Renardy, J. F., Roussarie, A., Schuller, J. P., Schwindling, J., Trabelsi, A., Vallage, B., Black, S. N., Dann, J. H., Johnson, R. P., Kim, H. Y., Litke, A. M., Mcneil, M. A., Taylor, G., Booth, C. N., Boswell, R., C. A. J., Cartwright, S., Combley, F., Kelly, M. S., Lehto, M., Newton, W. M., Reeve, J., Thompson, L. F., Bohrer, A., Brandt, S., Cowan, G., Grupen, C., Lutters, G., Saraiva, P., Smolik, L., Stephan, F., Apollonio, M., Bosisio, L., Marina, R. D., Giannini, G., Gobbo, B., Musolino, G., Rothberg, J., Wasserbaech, S., Armstrong, S. R., Charles, E., Elmer, P., D. P. S., Gonzalez, S., Greening, T. C., Hayes, O. J., Hu, H., Jin, S., Mcnamara, P. A., Nachtman, J. M., Nielsen, J., Orejudos, W., Pan, Y. B., Saadi, Y., Scott, I. J., Walsh, J., S. L., Wu, Wu, X., Yamartino, J. M., Zobernig, G., Barate, R, Buskulic, D, Decamp, D, Ghez, P, Goy, G, Lees, J, Lucotte, A, Minard, M, Nief, J, Pietrzyk, B, Casado, M, Chmeissani, M, Comas, P, Crespo, J, Delfino, M, Fernandez, E, Fernandez Bosman, M, Garrido, L, Juste, A, Martinez, M, Merino, G, Miquel, R, Mir, L, Padilla, C, Park, I, Pascual, A, Perlas, J, Riu, I, Sanchez, F, Colaleo, A, Creanza, D, de Palma, M, Gelao, G, Iaselli, G, Maggi, G, Maggi, M, Marinelli, N, Nuzzo, S, Ranieri, A, Raso, G, Ruggieri, F, Selvaggi, G, Silvestris, L, Tempesta, P, Tricomi, A, Zito, G, Huang, X, Lin, J, Ouyang, Q, Wang, T, Xie, Y, Xu, R, Xue, S, Zhang, J, Zhang, L, Zhao, W, Abbaneo, D, Alemany, R, Becker, U, Bazarko, A, Bright Thomas, P, Cattaneo, M, Cerutti, F, Dissertori, G, Drevermann, H, Forty, R, Frank, M, Hagelberg, R, Hansen, J, Harvey, J, Janot, P, Jost, B, Kneringer, E, Knobloch, J, Lehraus, I, Mato, P, Minten, A, Moneta, L, Pacheco, A, Pusztaszeri, J, Ranjard, F, Rizzo, G, Rolandi, L, Rousseau, D, Schlatter, D, Schmitt, M, Schneider, O, Tejessy, W, Teubert, F, Tomalin, I, Wachsmuth, H, Wagner, A, Ajaltouni, Z, Barres, A, Boyer, C, Falvard, A, Ferdi, C, Gay, P, Guicheney, C, Henrard, P, Jousset, J, Michel, B, Monteil, S, Montret, J, Pallin, D, Perret, P, Podlyski, F, Proriol, J, Rosnet, P, Rossignol, J, Fearnley, T, Hansen, P, Nilsson, B, Rensch, B, Waananen, A, Daskalakis, G, Kyriakis, A, Markou, C, Simopoulou, E, Siotis, I, Vayaki, A, Blondel, A, Bonneaud, G, Brient, J, Bourdon, P, Rouge, A, Rumpf, M, Valassi, A, Verderi, M, Videau, H, Candlin, D, Parsons, M, Focardi, E, Parrini, G, Zachariadou, K, Corden, M, Georgiopoulos, C, Jaffe, D, Antonelli, A, Bencivenni, G, Bologna, G, Bossi, F, Campana, P, Capon, G, Casper, D, Chiarella, V, Felici, G, Laurelli, P, Mannocchi, G, Murtas, F, Murtas, G, Passalacqua, L, Pepe Altarelli, M, Curtis, L, Dorris, S, Halley, A, Knowles, I, Lynch, J, O'Shea, V, Raine, C, Scarr, J, Smith, K, Teixeira Dias, P, Thompson, A, Thomson, E, Thomson, F, Turnbull, R, Buchmuller, O, Dhamotharan, S, Geweniger, C, Graefe, G, Hanke, P, Hansper, G, Hepp, V, Kluge, E, Putzer, A, Sommer, J, Tittel, K, Werner, S, Wunsch, M, Beuselinck, R, Binnie, D, Cameron, W, Dornan, P, Girone, M, Goodsir, S, Martin, E, Moutoussi, A, Nash, J, Sedgbeer, J, Spagnolo, P, Stacey, A, Williams, M, Ghete, V, Girtler, P, Kuhn, D, Rudolph, G, Betteridge, A, Bowdery, C, Buck, P, Colrain, P, Crawford, G, Finch, A, Foster, F, Hughes, G, Jones, R, Sloan, T, Giehl, I, Greene, A, Hoffmann, C, Jakobs, K, Kleinknecht, K, Quast, G, Renk, B, Rohne, E, Sander, H, van Gemmeren, P, Zeitnitz, C, Aubert, J, Benchouk, C, Bonissent, A, Bujosa, G, Carr, J, Coyle, P, Diaconu, C, Etienne, F, Konstantinidis, N, Leroy, O, Motsch, F, Payre, P, Talby, M, Sadouki, A, Thulasidas, M, Trabelsi, K, Aleppo, M, Antonelli, M, Ragusa, F, Berlich, R, Blum, W, Buscher, V, Dietl, H, Ganis, G, Gotzhein, C, Kroha, H, Lutjens, G, Lutz, G, Manner, W, Moser, H, Richter, R, Rosado Schlosser, A, Schael, S, Settles, R, Seywerd, H, St Denis, R, Stenzel, H, Wiedenmann, W, Wolf, G, Boucrot, J, Callot, O, Chen, S, Choi, Y, Cordier, A, Davier, M, Duflot, L, Grivaz, J, Heusse, P, Hocker, A, Jacholkowska, A, Jacquet, M, Kim, D, Le Diberder, F, Lefrancois, J, Lutz, A, Nikolic, I, Schune, M, Simion, S, Tournefier, E, Veillet, J, Videau, I, Zerwas, D, Azzurri, P, Bagliesi, G, Batignani, G, Bettarini, S, Bozzi, C, Calderini, G, Carpinelli, M, Ciocci, M, Ciulli, V, Dell'Orso, R, Fantechi, N, Ferrante, I, Foa, L, Forti, F, Giassi, A, Giorgi, M, Gregorio, A, Ligabue, F, Lusiani, A, Marrocchesi, P, Messineo, A, Palla, F, Sanguinetti, G, Sciaba, A, Steinberger, J, Tenchini, R, Tonelli, G, Vannini, C, Venturi, A, Verdini, P, Blair, G, Bryant, L, Chambers, J, Gao, Y, Green, M, Medcalf, T, Perrodo, P, Strong, J, von Wimmersperg Toeller, J, Botterill, D, Clifft, R, Edgecock, T, Haywood, S, Norton, P, Thompson, J, Wright, A, Bloch Devaux, B, Colas, P, Emery, S, Kozanecki, W, Lancon, E, Lemaire, M, Locci, E, Perez, P, Rander, J, Renardy, J, Roussarie, A, Schuller, J, Schwindling, J, Trabelsi, A, Vallage, B, Black, S, Dann, J, Johnson, R, Kim, H, Litke, A, Mcneil, M, Taylor, G, Booth, C, Boswell, R, Brew, C, Cartwright, S, Combley, F, Kelly, M, Lehto, M, Newton, W, Reeve, J, Thompson, L, Bohrer, A, Brandt, S, Cowan, G, Grupen, C, Lutters, G, Saraiva, P, Smolik, L, Stephan, F, Apollonio, M, Bosisio, L, Della Marina, R, Giannini, G, Gobbo, B, Musolino, G, Rothberg, J, Wasserbaech, S, Armstrong, S, Charles, E, Elmer, P, Ferguson, D, Gonzalez, S, Greening, T, Hayes, O, Hu, H, Jin, S, Mcnamara, P, Nachtman, J, Nielsen, J, Orejudos, W, Pan, Y, Saadi, Y, Scott, I, Walsh, J, Wu, S, Wu, X, Yamartino, J, Zobernig, G, Lees, Jp, Minard, Mn, Nief, Jy, Casado, Mp, Crespo, Jm, Mir, Lm, Park, Ic, Perlas, Ja, Bazarko, Ao, Forty, Rw, Hansen, Jb, Pusztaszeri, Jf, Rolandi, Luigi, Tomalin, Ir, Montret, Jc, Rossignol, Jm, Hansen, Jd, Hansen, Jr, Hansen, Ph, Brient, Jc, Candlin, Dj, Parsons, Mi, Jaffe, De, Murtas, Gp, Dorris, Sj, Halley, Aw, Knowles, Ig, Lynch, Jg, Scarr, Jm, Turnbull, Rm, Kluge, Ee, Binnie, Dm, Dornan, Pj, Martin, Eb, Sedgbeer, Jk, Stacey, Am, Williams, Md, Ghete, Vm, Betteridge, Ap, Bowdery, Ck, Buck, Pg, Finch, Aj, Jones, Rwl, Williams, Mi, Greene, Am, Sander, Hg, Aubert, Jj, Moser, Hg, Grivaz, Jf, Kim, Dw, Lutz, Am, Schune, Mh, Veillet, Jj, Ciocci, Ma, Giorgi, Ma, Ligabue, Franco, Lusiani, Alberto, Verdini, Pg, Blair, Ga, Bryant, Lm, Chambers, Jt, Green, Mg, Strong, Ja, von Wimmersperg Toeller, Jh, Botterill, Dr, Clifft, Rw, Edgecock, Tr, Norton, Pr, Thompson, Jc, Wright, Ae, Lemaire, Mc, Renardy, Jf, Schuller, Jp, Black, Sn, Dann, Jh, Johnson, Rp, Kim, Hy, Litke, Am, Mcneil, Ma, Booth, Cn, Brew, Caj, Newton, Wm, Thompson, Lf, Armstrong, Sr, Ferguson, Dp, Greening, Tc, Hayes, Oj, Mcnamara, Pa, Nachtman, Jm, Pan, Yb, Scott, Ij, Wu, Sl, Yamartino, Jm, Zobernig, G., Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Corpusculaire - Clermont-Ferrand (LPC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), ALEPH, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Physics and Astronomy (miscellaneous) ,Physics ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,High Energy Physics::Experiment ,Astrophysics::Earth and Planetary Astrophysics ,Engineering (miscellaneous) ,Particle Physics - Experiment - Abstract
Using approximately 4 million hadronic Z decays recorded with the ALEPH detector from 1991 through 1995, the lifetime of the b baryon is measured with three independent methods. From the impact parameter distribution of candidate leptons in 1063 events with Lambda l(-) combinations, the average b baryon lifetime is measured to be 1.20 +/- 0.08 +/- 0.06 ps. From a sample of 193 fully reconstructed Lambda(c)(+) candidates correlated with a lepton and a sample of 46 Lambda l(+)l(-) combinations the Lambda(b) lifetime is measured to be 1.21+/-0.11 ps. The product branching fractions to these final states are Br(b-->Lambda(b)) . Br(Lambda(b) --> Lambda l(-)(v) over bar X) = 0.326 +/- 0.016 +/- 0.039% for the first sample and Br(b --> Lambda(b)) . Br(Lambda(b) --> Lambda(c)(+)l(-)(v) over bar X) = 0.86 +/- 0.07 +/- 0.14% for the second and third samples combined.
- Published
- 1998