Observation of orbitally excited B mesons

Experimental evidence for the existence of orbitally excited B meson states is presented in an analysis of the Bπ and B ∗π distribution of Q = m(B ∗∗) − m(B (∗)) − m(π) using Z 0 decay data taken with the DELPHI detector at LEP. The mean Q-value of the decays B ∗∗ → B (∗)π is measured to be 284 ± 5...

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Veröffentlicht in:	Physics letters. B 1995, Vol.345 (4), p.598-608
Hauptverfasser:	Adye, T., Aleksan, R., Almehed, S., Amaldi, U., Baubillier, M., Begalli, M., Bilenky, M.S., Bozzo, M., Brand, K.D., Brunet, J.-M., Buran, T., Camporesi, T., Cankocak, K., Carrilho, P., Cassio, V., Dahl-Jensen, E., Dam, M., Dauncey, P.D., De Brabandere, S., Dijkstra, H., Ekspong, G., Engel, J.-P., Ershaidat, N., Foeth, H., Franek, B., Fruhwirth, R., Gaspar, C., Gavillet, Ph, Gopal, G., Gorski, M., Gracco, V., Graziani, E., Harris, F.J., Hernando, J.A., Herr, H., Houlden, M., Huet, K., Jarlskog, G., Jonsson, L., Koratzinos, M., Kouznetsov, O., Kucewicz, W., Kulka, K., Lacasta, C., Lamsa, J.W., Lane, D.W., Last, I., Leder, G., Legan, C.K., Leitner, R., Lindner, R., Maehlum, G., Maio, A., Marco, J., Martinez-Rivero, C., Meyer, W.T., Mikulec, I., Naraghi, F., Olshevski, A.G., Orava, R., Osterberg, K., Paganini, P., Passeri, A., Pennanen, J., Pernegger, H., Perrotta, A., Piana, G., Pimenta, M., Plaszczynski, S., Read, A.L., Regler, M., Reid, D., Rinaudo, G., Ripp, I., Ronchese, P., Rosso, E., Sajot, G., Sannino, M., Schneider, H., Sciolla, G., Shellard, R.C., Smirnova, O., Souza-Santos, D., Squarcia, S., Stugu, B., Todorov, T., Tomaradze, A., Treille, D., Trischuk, W., Tuuva, T., Tyapkin, J.A., Van Eldik, J., Verlato, M., Weilhammer, P., Wickens, J.H., Williams, W.S.C., Zalewska, A., Zavrtanik, D., Zimin, N.I., Zontar, D.
Format:	Artikel
Sprache:	eng
Schlagworte:	High Energy Physics - Experiment Physics
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Zusammenfassung:	Experimental evidence for the existence of orbitally excited B meson states is presented in an analysis of the Bπ and B ∗π distribution of Q = m(B ∗∗) − m(B (∗)) − m(π) using Z 0 decay data taken with the DELPHI detector at LEP. The mean Q-value of the decays B ∗∗ → B (∗)π is measured to be 284 ± 5 (stat.) ± 15 (syst.) MeV/c 2, and the Gaussian width of the signal is 79 ± 5 (stat.) ± 8 (syst.) MeV/c 2. This signal can be described as a single resonance of mass m = 5732 ± 5 (stat.) ± 20 (syst.) MeV/c 2 and full width Γ = 145 ± 28 MeV/c 2. The observed shape is also consistent with the production of several broad and narrow states as predicted by the quark model and partly observed in the D-meson sector. The production rate of B ∗∗ per b-jet is found to be 0.27 ± 0.02 (stat.) ± 0.06 (syst.).
ISSN:	0370-2693 1873-2445
DOI:	10.1016/0370-2693(94)01696-A