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Abstract
The rate of like-charge dimuons has been measured with the MAC detector in hardonic events produced in e +e − annihilation at √ s=29 GeV. If the observed excess is attributed to B 0B̄ 0 mixing, the corresponding value of the mixing parameter χ= Γ(B→ μ −X)/ Γ(B→ μ ±X) is χ=0.21 +0.29 −0.15 and χ>0.02 at 90% CL.
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