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The authors measure the asymmetry between positive and negative same-sign muon pairs originating from semileptonic decays of pairs of B hadrons. Low transverse momentum dimuon pairs are evaluated to determine B hadron content using a log likelihood fit to two-dimensional impact parameter significance templates. Corrections are made for asymmetries arising from the detector, trigger, and hadrons which are reconstructed as muons. Using 1.1 million muon pairs from data corresponding to an integrated luminosity of 1.6 fb{sup -1}, they find 210,000 same-sign muon pairs with both muon candidates coming from B decays. After corrections, they measure a semileptonic asymmetry from neutral B mixing of A{sub SL} = 0.0080 {+-} 0.0090(stat) {+-} 0.0068(syst). This asymmetry can be interpreted as a constraint on the complex phase of the CKM matrix element V{sub ts} by using the B{sup 0} neutral mixing contribution measured at the B factories. They measure the CP violating asymmetry from B{sub s} mixing to be A{sub SL}{sup s} = 0.020 {+-} 0.028

Measurement of the cp asymmetry in semimuonic b decays produced in ppbar collision at √s= 1.96 TeV