Measurement of the CP-violation parameter of B-0 mixing and decay with p(p)over-bar ->mu mu X data

We measure the dimuon charge asymmetryA in p (p) over bar collisions at a center of mass energy root s=1960 GeV. The data was recorded with the D0 detector and corresponds to an integrated luminosity of approximately 1.0 fb(-1). Assuming that the asymmetryA is due to asymmetric B-0 (B) over bar (0) mixing and decay, we extract the CP-violationparameter of B-0 mixing and decay: ((epsilon B0))/(1+ vertical barepsilon B0 vertical bar2)=(AB0)/(4)= -0.0023 +/- 0.0011(stat)+/- 0.0008(syst).A(B)(0) is the dimuon charge asymmetryfrom decays of B-0(B) over bar (0) pairs. The general case, with CP violationin both B-0 and B-s( 0) systems, is also considered. Finally we obtain the forward-backward asymmetrythat quantifies the tendency of mu(+) to go in the proton direction and mu(-) to go in the antiprotondirection. The results are consistent with the standard model and constrain new physics.