Measurement of the partial width of the decay of the Z 0 into charm quark pairs

Measurement of the partial width of the decay of the Z 0 into charm quark pairs

A determination of the partial width Γ c c ̄ of the Z 0 boson into charm quark pairs is presented, based on a total sample of 36 900 Z 0 hadronic decays measured with the DELPHI detector at the LEP collider. The production rate of cc̄ events is derived from the inclusive analysis of charged pions co...

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Veröffentlicht in:Physics letters. B 1990, Vol.252 (1), p.140-148
Hauptverfasser: Adye, T., Alvsvaag, S.J., Augustin, J.-E., Barao, F., Baroncelli, A., Baubillier, M., Beeston, C.J., Billoir, P., Bollini, D., Booth, P.S.L., Bozzo, M., Brand, K.D., Brown, R.C.A., Calvi, M., Camacho Rozas, A.J., Castillo Gimenez, M.V., Cavallo, F.R., Charpentier, P., Chelkov, G.A., Contreras, J.L., Czellar, S., Dalmagne, B., De Boer, W., De Fez Laso, M.D.M., De Groot, N., De La Vaissiere, C., Diddens, A.N., Engel, J.-P., Firestone, A., Frenkiel, P., Furstenau, H., Galeazzi, G., Garcia, J., Graziani, E., Gros, M.-H., Grosdidier, G., Grossetete, B., Hakansson, A., De Monchenault, G.Hamel, Herbst, I., Herr, H., Hilke, H.J., Holmes, R., Holmgren, S.-O., Hrubec, J., Hultqvist, K., Ioannou, P., Jarry, P., Jonker, M., Juillot, P., Kluit, P., Kokkinias, P., Kostrikov, M., Krupinski, W., Kucewicz, W., Lauhakangas, R., Leder, G., Lokajicek, M., Lucock, R., Lund-Jensen, B., Marco, J., Marin, J.-C., Markou, A., Matthiae, G., Moeller, R., Moenig, K., Nnau-Lorzen, U., Orava, R., Passeri, A., Pegoraro, M., Radojicic, D., Ratoff, P.N., Redaelli, N.G., Regler, M., Rosenberg, E.I., Roudeau, P., Segar, A.M., Sekulin, R., Sette, G., Shellard, R.C., Skaali, T.B., Sosnowski, R., Stichelbaut, F., Szczekowski, M., Theodosiou, G., Tilquin, A., Toet, D.Z., Tortora, L., Tzamarias, S., Ueberschaer, S., Van Dam, P., Van Doninck, W.K., Vegni, Velasco, J., Vrba, V., wayne, M., Wehr, A., Woschnagg, K., Yamdagni, N., Zalewski, P.
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Sprache:eng
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High Energy Physics - Experiment
Physics
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Zusammenfassung:A determination of the partial width Γ c c ̄ of the Z 0 boson into charm quark pairs is presented, based on a total sample of 36 900 Z 0 hadronic decays measured with the DELPHI detector at the LEP collider. The production rate of cc̄ events is derived from the inclusive analysis of charged pions coming from the decay of charmed meson D ∗+→ D 0π + and D ∗−→ D ̄ 0 π − where the π ± is constrained by kinematics to have a low p T with respect to the axis. The probability to produce these π ± from D ∗± decay in cc̄ events is taken to be 0.31 ±_0.05 as measured at √ s=10.55 GeV. The measured relative partial width Γ c c ̄ Γ h = 0.162± 0.030 ( stat.) ±0.050 ( syst.) is in good agreement with the standard moel value of 0.171. Together with our previous measurement of the total hadronic width Γ h this implies Γ c c ̄ = 282±53 ( stat.)±88( syst.) MeV .
ISSN:0370-2693
1873-2445
DOI:10.1016/0370-2693(90)91096-T