Measurement of the fraction of hadronic Z decays into charm quark pairs

R. Barate, D. Buskulic, D. Decamp, P. Ghez, C. Goy, J. P. Lees, A. Lucotte, E. Merle, M. N. Minard, J. Y. Nief, B. Pietrzyk, R. Alemany, G. Boix, M. P. Casado, M. Chmeissani, J. M. Crespo, M. Delfino, E. Fernandez, M. Fernandez-Bosman, L. GarridoE. Graugès, A. Juste, M. Martinez, G. Merino, R. Miquel, L. M. Mir, I. C. Park, A. Pascual, J. A. Perlas, I. Riu, F. Sanchez, A. Colaleo, D. Creanza, M. de Palma, G. Gelao, G. Iaselli, G. Maggi, M. Maggi, S. Nuzzo, A. Ranieri, G. Raso, F. Ruggieri, G. Selvaggi, L. Silvestris, P. Tempesta, A. Tricomi, G. Zito, X. Huang, J. Lin, Q. Ouyang, T. Wang, Y. Xie, R. Xu, S. Xue, J. Zhang, L. Zhang, W. Zhao, D. Abbaneo, U. Becker, P. Bright-Thomas, D. Casper, M. Cattaneo, V. Ciulli, G. Dissertori, H. Drevermann, R. W. Forty, M. Frank, R. Hagelberg, J. B. Hansen, J. Harvey, P. Janot, B. Jost, I. Lehraus, P. Mato, A. Minten, L. Moneta, A. Pacheco, J. F. Pusztaszeri, F. Ranjard, L. Rolandi, D. Rousseau, D. Schlatter, M. Schmitt, O. Schneider, W. Tejessy, F. Teubert, I. R. Tomalin, H. Wachsmuth, A. Wagner, Z. Ajaltouni, F. Badaud, G. Chazelle, O. Deschamps, A. Falvard, C. Ferdi, P. Gay, C. Guicheney, P. Henrard, J. Jousset, B. Michel

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10 Citations (Scopus)

Abstract

The full statistics of hadronic Z decays collected with the ALEPH detector are analysed to measure, by three methods, the ratio, Rc, of the partial decay width of the Z into cc̄ quarks to the total hadronic width. One method uses the inclusive p and p⊥ spectra of electrons. The other two use a double-tagging technique to measure Rc independently of the charm-tagging efficiency. In one, the tagging procedure uses the reconstruction of high momentum charmed mesons (D*+, D+ and D0) to detect the charm quarks. In the other, a charm quark is tagged from the D*'s reconstructed in the D*+ → π+D0 decay channel and the other from the slow pion from the D*- → π-D̄0 decay. The combination of these measurements leads to Rc = Γ(Z → cc̄)/Γ(Z → hadrons)) = 0.1681 ± 0.0054(stat) ± 0.0062(syst).
Original languageEnglish
Pages (from-to)557-570
JournalEuropean Physical Journal C
Volume4
Issue number4
Publication statusPublished - 1 Jan 1998

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