Measurement of the fraction of hadronic Z decays into charm quark pairs
The full statistics of hadronic Z decays collected with the ALEPH detector are analysed to measure, by three methods, the ratio, RcRc, of the partial decay width of the Z into cc¯cc¯ quarks to the total hadronic width. One method uses the inclusive pp and p⊥p⊥ spectra of electrons. The other two use...
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| Format: | text |
| Language: | English |
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Institutional Knowledge at Singapore Management University
1998
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| Online Access: | https://ink.library.smu.edu.sg/sis_research/5846 https://ink.library.smu.edu.sg/context/sis_research/article/6849/viewcontent/CM_P00068167.pdf |
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| Institution: | Singapore Management University |
| Language: | English |
| Summary: | The full statistics of hadronic Z decays collected with the ALEPH detector are analysed to measure, by three methods, the ratio, RcRc, of the partial decay width of the Z into cc¯cc¯ quarks to the total hadronic width. One method uses the inclusive pp and p⊥p⊥ spectra of electrons. The other two use a double-tagging technique to measure RcRc independently of the charm-tagging efficiency. In one, the tagging procedure uses the reconstruction of high momentum charmed mesons (D∗+D∗+, D+D+ and \({\rm D^0}$) to detect the charm quarks. In the other, a charm quark is tagged from the D∗D∗'s reconstructed in the D∗+→π+D0D∗+→π+D0 decay channel and the other from the slow pion from the D∗−→π−D¯0D∗−→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)Rc=Γ(Z→cc¯)/Γ(Z→hadrons))=0.1681±0.0054(stat)±0.0062(syst). |
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