Bounds on the Cabibbo-Kobayashi-Maskawa matrix elements |V$_{td}$| and |V$_{ts}$| from experiments on B0 - $\overline{B}$0 mixings

We present a theoretical analysis of the process p p ̄ → μ ± X, μ ± μ ± X′, μ + μ − X′ due to heavy flavour production and decays, based on perturbative quantum chromodynamics, QCD. We find reasonable agreement for the inclusive rates and distributions between the UA1 measurement and our calculations, with the exception of the dimuon ratio R( ±± +−− ) , which is found typically a factor ∼ 1.8 smaller than the UA1 data. We interpret this excess in terms of B s 0 −B̄ s 0 mixing and obtain a lower bound on the mixing probability, r s > 0.14. In the standard model this implies a lower bound on the Cabibbo-Kobayashi-Maskawa matrix element | V ts | given the top quark mass. The lower bound | V ts | and the upper bound on | V td |, obtained from the (upper bound) B d 0 −B̄ d 0 mixing probability, r d , from e + e − experiments are worked out.