We have over 12,000 students, from over 100 countries, within one of the safest campuses in the UK


93% of Lancaster students go into work or further study within six months of graduating

Home > Research > Publications & Outputs > Observation of doubly charmed B decays at LEP
View graph of relations

« Back

Observation of doubly charmed B decays at LEP

Research output: Contribution to journalJournal article


Journal publication date07/1998
JournalThe European Physical Journal C (EPJ C) - Particles and Fields
Number of pages21
Original languageEnglish


A search for doubly-charmed B decays with both charmed mesons reconstructed is performed, using about 3.8 million hadronic Z decays recorded with the ALEPH detector at LEP. A clear signal is observed in the channels B→DsD¯(X) and B→DD¯(X) (where D can be either a D 0 , a D + or a D ∗+ ), providing the first direct evidence for doubly-charmed B decays involving no Ds production. Evidence for associated K0S and K± production in the decays B→DD¯(X) is also presented and some candidates for completely reconstructed decays B→DsD¯(nπ) , B→DD¯K0S and B→DD¯K± are observed. Furthermore, candidates for the two-body Cabibbo suppressed decays B0→D∗−D∗+ and B−→D(∗)0D(∗)− are also observed. Measurements of the corresponding branching fractions are extracted.