ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2002, vol. 89, p. 251803/1-251803/6
Measurement of the B0-B̄0 mixing parameter Δmd using semileptonic B0 decays
The Β0-̄Β0 mixing parameter Δmd was measured using Β0→D*-ℓ+ν decays in a 29.1 fb-1 data sample collected with the Belle detector at the KEKB e+e- collider operating at the Υ(4s) resonance. From an unbinned maximum-likelihood fit to the Δt distribution for Β pairs with the same and opposite flavors, it was possible to obtain Δmd=0.494±0.012(stat)±0.015(syst) ps-1.