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Observation of B ̄ (s) 0 → J / ψ f 1 (1285) decays and measurement of the f 1 (1285) mixing angle

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FIG. 1 (color online).Invariant mass distribution for J=ψ πþ π−πþ π− combinations. The data are fit with Crystal Ball functionsfor B¯0 [(red) dashed curve] and B¯0s [(purple) dot-dashed curve]signals, an exponential function for combinatoric background(bla
FIG. 2 (color online).Background subtracted invariant mass distributions of the four pions in (a) B¯0s and (b) B¯0 decays are shown in thehistogram overlaid with the (black) solid points with the error bars indicating the uncertainties
TABLE I.Fit results for B¯0s → J=ψ f1ð1285Þ and B¯0 → J=ψf1ð1285Þ decays.
TABLE III.Branching fractions used for normalization.

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