Measurement of the Bs0 lifetime

• Published in: Physics letters. B 1994-02, Vol.322 (3), p.275-286
• Main Authors: Buskulic, D., Goy, C., Pietrzyk, B., Crespo, J.M., Martinez, M., Mattison, T., Orteu, S., Pacheco, A., Creanza, D., Natali, S., Romano, F., Tempesta, P., Chai, Y., Huang, D., Huang, X., Xu, D., Casper, D., Drevermann, H., Knobloch, J., Lehraus, I., Pater, J.R., Ranjard, F., Veenhof, R., Wasserbaech, S., Witzeling, W., Bardadin-Otwinowska, M., Falvard, A., Henrard, P., Jousset, J., Michel, B., Montret, J.-C., Podlyski, F., Fearnley, T., Hansen, J.B., Hansen, J.R., Johnson, S.D., Møllerud, R., Simopoulou, E., Bourdon, P., Parsons, M.I., Jaffe, D.E., Bologna, G., Bossi, F., Capon, G., Murtas, F., Colrain, P., ten Have, I., Raine, C., Smith, K., Thorn, S., Hepp, V., Rensch, B., Tittel, K., Beuselinck, R., Colling, D.J., Nash, J., Kuhn, D., Brodbeck, T.J., Patel, A., Sander, H.-G., Wanke, R., Carr, J., Drinkard, J., Nicod, D., Ross, L., Bauer, C., Blum, W., Halley, A.W., Lauber, J., Lütjens, G., Lutz, G., Männer, W., Richter, R., Schröder, J., Cordier, A., Grivaz, J.-F., Carpinelli, M., Ciocci, M.A., Dell'Orso, R., Giassi, A., Lusiani, A., Rizzo, G., Spagnolo, P., Tonelli, G., Triggiani, G., Gao, Y., March, P.V., Bertin, V., Haywood, S., Norton, P.R., Emery, S., Lemaire, M.C., Locci, E., Schwindling, J., Smolik, L., Della Marina, R., Giannini, G., Harton, J.L., Shi, Z.H., Walsh, A.M.
• Format: Article
• Language: English
• Subjects: Decays of baryons; Exact sciences and technology; Leptonic and semileptonic decays; Physics; Specific reactions and phenomenology; The physics of elementary particles and fields
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/0370-2693(94)91120-7

The lifetime of the B s 0 has been measured in a data sample of 8890000 hadronic events recorded with the ALEPH detector at LEP. After background subtraction 30.8 ± 6.9 events are attributed to the semileptonic decay of the B s 0 to a D s − and an opposite-sign lepton. A maximum-likelihood fit to the distribution of the proper times of these events yields a B s 0 lifetime of τ B s = 1.92 −0.35 +0.45 ± 0.04 ps.