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Observation of the time dependence of B(d)0 - anti-B(d)0 mixing

Research output: Contribution to journalJournal article

  • ALEPH Collaboration
<mark>Journal publication date</mark>1993
<mark>Journal</mark>Physics Letters B
Issue number3-4
Number of pages11
Pages (from-to)498-508
<mark>Original language</mark>English


The time dependence of oscillations has been observed using events with a d∗, decaying into a D0π+, and a lepton in opposite hemispheres. The time dependence of the oscillations is derived from the displacement of the D0 vertex and the D∗-lepton charge correlation. From a fit for the oscillation frequency the mass difference of the B0d states is measured: Δm = [3.44+0.65−0.70(stat.)+0.26−0.20(syst.)] × 10−4 eV/c2.