Measurement of the (B)over-bar → D-(*)pi l(nu)over-bar(l) branching fraction

Abreu, P. et al. (2000) Measurement of the (B)over-bar → D-(*)pi l(nu)over-bar(l) branching fraction. Physics Letters B, 475(3-4), 407 -428. (doi: 10.1016/S0370-2693(00)00040-X)

Abstract

A study of b semileptonic decays into D, D pi(+/-) and D*pi(+/- ) final states is presented. The D-0, D+ and D*(+) mesons are exclusively reconstructed in Z decay data recorded from 1992 to 1995 in the DELPHI experiment at LEP. The overall branching fractions are measured to be: BR(b → D(0)l(-)[(upsilon)over bar]X-l) = (7.04 +/- 0.34(stat) +/- 0.36 (syst.exp) +/- 0.17(BRD))%, BR(b → D(+)l(-)[(upsilon)over bar]X-l) = (2.72 +/- 0.19(stat) +/- 0.16(syst.exp) +/- 0.18(BRD))%, BR(b → D*(+)l(-)[(upsilon)over bar]X-l) = (2.75 +/- 0.17(stat) +/- 0.13 (syst.exp) +/- 0.09 (BRD))%, where the D-0 and D+ results include also contributions from D*(0) and D*(+) decays. A fit to the distribution of the pi(+/-) impact parameter to the primary interaction vertex provides a measurement of the b semileptonic branching fractions into the D(0)pi(+/-)X, D(+)pi(+/-)X and D*(+)pi(+/-)X final states. Assuming that single pion decay modes of B mesons dominate, the partial rates for (B) over bar → D pi l(-)[(upsilon)over bar](l) and (B) over bar → D*pi l(-)[(upsilon)over bar](l) have been obtained, corresponding to a total branching fraction: BR((B) over bar → D pi l(-)[(upsilon)over bar](l)) + BR((B) over bar → D*pi l(-)[(upsilon)over bar](l)) = (3.40 +/- 0.52 (stat) +/- 0.32 (syst))%. This result agrees well with the observed difference between the total B semileptonic branching fraction and the sum of the (B) over bar → Dl(-) upsilon(l) and D* l(- )[(upsilon)over bar](l) branching fractions.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Battaglia, Dr Marina
• Authors: Abreu, P., Adam, W., Adye, T., Adzic, P., Ajinenko, I., Albrecht, Z., Alderweireld, T., Alekseev, G.D., Alemany, R., Allmendinger, T., Allport, P.P., Almehed, S., Amaldi, U., Amapane, N., Amato, S., Anassontzis, E.G., Andersson, P., Andreazza, A., Andringa, S., Antilogus, P., Apel, W.D., Arnoud, Y., Asman, B., Augustin, J.E., Augustinus, A., Baillon, P., Bambade, P., Barao, F., Barbiellini, G., Barbier, R., Bardin, D.Y., Barker, G., Baroncelli, A., Battaglia, M., Baubillier, M., Becks, K.H., Begalli, M., Behrmann, A., Beilliere, P., Belokopytov, Y., Benekos, N.C., Benvenuti, A.C., Berat, C., Berggren, M., Bertini, D., Bertrand, D., Besancon, M., Bigi, M., Bilenky, M.S., Bizouard, M.A., Bloch, D., Blom, H.M., Bonesini, M., Bonivento, W., Boonekamp, M., Booth, P.S.L., Borgland, A.W., Borisov, G., Bosio, C., Botner, O., Boudinov, E., Bouquet, B., Bourdarios, C., Bowcock, T.J.V., Boyko, I., Bozovic, I., Bozzo, M., Bracko, M., Branchini, P., Brenner, R.A., Bruckman, P., Brunet, J.M., Bugge, L., Buran, T., Buschbeck, B., Buschmann, P., Cabrera, S., Caccia, M., Calvi, M., Camporesi, T., Canale, V., Carena, F., Carroll, L., Caso, C., Gimenez, M.V.C., Cattai, A., Cavallo, F.R., Chabaud, V., Charpentier, P., Chaussard, L., Checchia, P., Chelkov, G.A., Chierici, R., Chliapnikov, P., Chochula, P., Chorowicz, V., Chudoba, J., Cieslik, K., Collins, P., Contri, R., Cortina, E., Cosme, G., Cossutti, F., Crawley, H.B., Crennell, D., Crepe, S., Crosetti, G., Maestro, J.C., Czellar, S., Davenport, M., Da Silva, W., Della Ricca, G., Delpierre, P., Demaria, N., De Angelis, A., De Boer, W., De Clercq, C., De Lotto, B., De Min, A., de Paula, L., Dijkstra, H., Di Ciaccio, L., Dolbeau, J., Doroba, K., Dracos, M., Drees, J., Dris, M., Duperrin, A., Durand, J.D., Eigen, G., Ekelof, T., Ekspong, G., Ellert, M., Elsing, M., Engel, J.P., Santo, M.E., Fanourakis, G., Fassouliotis, D., Fayot, J., Feindt, M., Ferrari, P., Ferrer, A., Ferrer-Ribas, E., Ferro, F., Fichet, S., Firestone, A., Flagmeyer, U., Foeth, H., Fokitis, E., Fontanelli, F., Franek, B., Frodesen, A.G., Fruhwirth, R., Fulda-Quenzer, F., Fuster, J., Galloni, A., Gamba, D., Gamblin, S., Gandelman, M., Garcia, C., Gaspar, C., Gaspar, M., Gasparini, U., Gavillet, P., Gazis, E.N., Gele, D., Gerdyukov, L., Ghodbane, N., Gil, I., Glege, F., Gokieli, R., Golob, B., Gomez-Ceballos, G., Goncalves, P., Caballero, I.G., Gopal, G., Gorn, L., Gracco, V., Grahl, J., Graziani, E., Gris, P., Grosdidier, G., Grzelak, K., Guy, J., Hahn, F., Hanh, S., Haider, S., Hallgren, A., Hamacher, K., Hansen, J., Harris, F.J., Hedberg, V., Heising, S., Hernandez, J.J., Herquet, P., Herr, H., Hessing, T.L., Heuser, J.M., Higon, E., Holmgren, S.O., Holt, P.J., Hoorelbeke, S., Houlden, M., Hrubec, J., Huber, M., Huet, K., Hughes, G.J., Hultqvist, K., Jackson, J.N., Jacobsson, R., Jalocha, P., Janik, R., Jarlskog, C., Jarlskog, G., Jarry, P., Jean-Marie, B., Jeans, D., Johansson, E.K., Jonsson, P., Joram, C., Juillot, P., Jungermann, L., Kapusta, F., Karafasoulis, K., Katsanevas, S., Katsoufis, E.C., Keranen, R., Kernel, G., Kersevan, B.P., Khokhlov, Y., Khomenko, B.A., Khovanski, N.N., Kiiskinen, A., King, B., Kinvig, A., Kjaer, N.J., Klapp, O., Klein, H., Kluit, P., Kokkinias, P., Kostioukhine, V., Kourkoumelis, C., Kouznetsov, O., Krammer, M., Kriznic, E., Krumstein, Z., Kubinec, P., Kurowska, J., Kurvinen, K., Lamsa, J.W., Lane, D.W., Lapin, V., Laugier, J.P., Lauhakangas, R., and Leder, G.
• Subjects: Q Science > QC Physics
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Physics Letters B
• Publisher: Elsevier BV
• ISSN: 0370-2693
• ISSN (Online): 1873-2445