B ∗ production in Z decays at LEP

• Published in: Physics letters. B Vol. 345; no. 4; pp. 589 - 597
• Main Authors: Aloisio, A., Ambrosi, G., Alkhazov, G., Bakken, J.A., Ball, R.C., Banerjee, S., Barillér, R., Bay, A., Bilei, G.M., Böhm, A., Bouwens, B., Brambilla, E., Cai, X.D., Casaus, J., Castello, R., Chen, H.F., Chien, C.Y., Cifarelli, L., Clare, I., Cohn, H.O., Dénes, E., Duhem, F., El Mamouni, H., Engler, A., Eppling, F.J., Falciano, S., Fesefeldt, H., Field, J.H., Forconi, G., Gailloud, M., Gerald, J., Gheordanescu, N., Goldstein, J., He, J.T., Hebert, M., Hervé, A., Hilgers, K., Jin, B.N., Kaur, M., Kirsch, S., Kittel, W., Klimentov, A., Koulbardis, A., Lanske, D., Lee, D.M., Li, C., Lieb, E., Lin, W.T., Lohmann, W., Lu, Y.S., Malinin, A., Massaro, G.G.G., McNally, D., Merk, M., Metzger, W.J., Mihul, A., Mills, G.B., Mirabelli, G., Monteleoni, B., Morand, R., Paolucci, P., Passaleva, G., Pensotti, S., Plyaskin, V., Pojidaev, V., Read, K., Reucroft, S., Ricker, A., Rodriguez, F.J., Röhner, S., Rosselet, Ph, van Rossum, W., Roth, S., Rubbia, A., Salicio, J.M., Sanchez, E., Sassowsky, M., Schäfer, C., Sehgal, R., Servoli, L., Shi, X.R., Sopczak, A., Soulimov, V., Spickermann, T., Stickland, D.P., Stone, H., Swain, J.D., Ting, S.M., Tonutti, M., Vetlitsky, I., Vikas, P., Vorobyov, A.A., Vuilleumier, L., Wallraff, W., Yang, G., Zaccardelli, C., Zhang, D.H., Zhou, B., Zhu, R.Y., Zichichi, A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 23-02-1995
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/0370-2693(95)01611-S

The production of B
∗ mesons in Z decays has been measured at LEP with the L3 detector. A sample of Z → b
b
events was obtained by tagging muons in 1.6 million hadronic Z decays collected in 1991, 1992 and 1993. A signal with a peak value of
E
γ
= 46.3 ± 1.9 (stat) MeV in the B rest frame energy spectrum was interpreted to come from the decay B
∗ → γB. The inclusive production ratio of B
∗ mesons relative to B mesons was determined from a fit to the spectrum to be
N
B
∗
(N
B
∗
+ N
B
)
= 0.76 ± 0.08 ± 0.06
, where the first error is statistical and the second is systematic.