Study of the fragmentation of b quarks into B mesons at the Z peak

Study of the fragmentation of b quarks into B mesons at the Z peak

The fragmentation of b quarks into B mesons is studied with four million hadronic Z decays collected by the ALEPH experiment during the years 1991–1995. A semi-exclusive reconstruction of B→ℓ νD (★) decays is performed, by combining lepton candidates with fully reconstructed D (★) mesons while the n...

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Veröffentlicht in:Physics letters. B 2001-07, Vol.512 (1), p.30-48
Hauptverfasser: Merle, E., Fernandez-Bosman, M., Miquel, R., Pacheco, A., Iaselli, G., Ruggieri, F., Ouyang, Q., Xie, Y., Xu, R., Zhang, J., Abbaneo, D., Buchmüller, O., Kado, M., Mato, P., Ranjard, F., Schlatter, D., Tejessy, W., Teubert, F., Henrard, P., Jousset, J., Podlyski, F., Hansen, J.R., Hansen, P.H., Nilsson, B.S., Markou, C., Brient, J.-C., Verderi, M., Focardi, E., Bencivenni, G., Mannocchi, G., Halley, A.W., Negus, P., O'Shea, V., Raine, C., Wasserbaech, S., Cavanaugh, R., Geweniger, C., Hanke, P., Hansper, G., Hepp, V., Sommer, J., Wunsch, M., Girone, M., Thompson, J.C., Girtler, P., Kuhn, D., Rudolph, G., Foster, F., Hughes, G., Robertson, N.A., Kleinknecht, K., Renk, B., Leroy, O., Talby, M., Ragusa, F., David, A., Lütjens, G., Männer, W., Stenzel, H., Wiedenmann, W., Wolf, G., Boucrot, J., Callot, O., Heusse, Ph, Boccali, T., Calderini, G., Giammanco, A., Giassi, A., Palla, F., Tenchini, R., Venturi, A., Strong, J.A., von Wimmersperg-Toeller, J.H., Clifft, R.W., Bloch-Devaux, B., Colas, P., Kozanecki, W., Locci, E., Renardy, J.-F., Schuller, J.-P., Schwindling, J., Konstantinidis, N., Litke, A.M., Taylor, G., Cartwright, S., Lehto, M., Thompson, L.F., Brandt, S., Grupen, C., Ngac, A., Giannini, G., Cranmer, K., Elmer, P., Hu, H., McNamara, P.A., Orejudos, W., Pan, Y.B., Saadi, Y., Walsh, J., Wu, Sau Lan
Format: Artikel
Sprache:eng
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High Energy Physics - Experiment
Physics
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Zusammenfassung:The fragmentation of b quarks into B mesons is studied with four million hadronic Z decays collected by the ALEPH experiment during the years 1991–1995. A semi-exclusive reconstruction of B→ℓ νD (★) decays is performed, by combining lepton candidates with fully reconstructed D (★) mesons while the neutrino energy is estimated from the missing energy of the event. The mean value of x B wd, the energy of the weakly-decaying B meson normalised to the beam energy, is found to be 〈x B wd 〉=0.716±0.006 ( stat)±0.006 ( syst), using a model-independent method; the corresponding value for the energy of the leading B meson is 〈x B L 〉=0.736±0.006 ( stat)±0.006 ( syst) . The reconstructed spectra are compared with different fragmentation models.
ISSN:0370-2693
1873-2445
DOI:10.1016/S0370-2693(01)00690-6