Investigation of Inclusive CP Asymmetries in B$^{0}$ Decays

A search for CP violating effects in the mixing of neutral B mesons is performed using a sample of 4.1 million hadronic Z decays collected with the ALEPH detector from 1991 to 1995. By studying time-dependent asymmetries in flavour-tagged samples of semileptonic and fully inclusive b-hadron decays,...

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Published in:The European physical journal. C, Particles and fields Particles and fields, 2001, Vol.20, p.431-443
Main Authors: Barate, R., Decamp, D., Ghez, P., Goy, C., Lees, J P., Merle, E., Minard, M N., Pietrzyk, B., Bravo, S., Casado, M P., Chmeissani, M., Crespo, J M., Fernandez, E., Fernandez-Bosman, M., Garrido, L., Grauges, E., Martinez, M., Merino, G., Miquel, R., Mir, L M., Pacheco, A., Ruiz, H., Colaleo, A., Creanza, D., de Palma, M., Iaselli, G., Maggi, G., Maggi, M., Nuzzo, S., Ranieri, A., Raso, G., Ruggieri, F., Selvaggi, G., Silvestris, L., Tempesta, P., Tricomi, A., Zito, G., Huang, X., Lin, Jiali, Ouyang, Q., Wang, T., Xie, Y., Xu, R., Xue, S., Zhang, J., Zhang, L., Zhao, W., Abbaneo, D., Boix, G., Buchmuller, O., Cattaneo, M., Cerutti, F., Dissertori, G., Drevermann, H., Forty, R W., Frank, M., Greening, T C., Hansen, J B., Harvey, J., Janot, P., Jost, B., Lehraus, I., Mato, P., Minten, A., Moutoussi, A., Ranjard, F., Rolandi, L., Schlatter, D., Schmitt, M., Schneider, O., Spagnolo, P., Tejessy, W., Teubert, F., Tournefier, E., Wright, a E., Ajaltouni, Ziad Zj, Badaud, F., Chazelle, G., Deschamps, O., Falvard, Alain, Gay, Pascal, Guicheney, C., Henrard, Pierre, Jousset, J., Michel, B., Monteil, S., Montret, Jean-Claude, Pallin, D., Perret, Pascal, Podlyski, F., Hansen, J D., Hansen, J R., Hansen, P H., Nilsson, B S., Petersen, B., Waananen, A., Daskalakis, G., Kyriakis, A., Markou, C., Simopoulou, E.
Format: Article
Language:English
Subjects:
High Energy Physics - Experiment
Physics
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Summary:A search for CP violating effects in the mixing of neutral B mesons is performed using a sample of 4.1 million hadronic Z decays collected with the ALEPH detector from 1991 to 1995. By studying time-dependent asymmetries in flavour-tagged samples of semileptonic and fully inclusive b-hadron decays, two measurements of the semileptonic asymmetry a_cp are extracted. No evidence for CP violation is observed, and the combined value a_cp = -0.013 +- 0.026 is obtained.
ISSN:1434-6044
1434-6052
DOI:10.1007/s100520100644