Figure 5

Opposite-sign dimuon invariant mass spectra, in bins of transverse momentum, for the p-Pband Pb-p data samples For the fits shown here, Crystal Ball functions (shown as dashed lines) and a variable-width Gaussian have been used for the resonances and the background, respectively The $\chi^{2}$/ndf refers to the goodness of the signal and background combined fit in the displayed mass range.