ALEPH Collaboration, The and Barate, R. and Betteridge, Andrew and Bowdery, Christopher and Colrain, Paul and Finch, Alexander and Foster, Frank and Hughes, Gareth and Jones, Roger and Williams, Mark (1998) Measurement of the fraction of hadronic Z decays into charm quark pairs. The European Physical Journal C (EPJ C) - Particles and Fields, 4 (4). pp. 557-570. ISSN 1434-6052
Full text not available from this repository.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 cc¯ 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−D¯0 decay. The combination of these measurements leads to Rc=Γ(Z→cc¯)/Γ(Z→hadrons))=0.1681±0.0054(stat)±0.0062(syst) .