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(a) Single-muon transverse-momentum spectrum for $\abs{\eta^\Pgm}<$2.1 in PbPb data (red-filled circles). Signal (green-hatched histogram) and background (blue-dashed histogram) contributions are fitted (black solid line) to the data. (b) Mean value of \PTm\ for charged tracks as a function of centrality, before any event selection is applied on the muon-triggered data (black squares) and after it (red-filled circles), together with predictions from the \PYTHIA{}+\HYDJET samples (green triangles). (c) Transverse mass distribution for selected events in PbPb (red-filled circles) and \Pp\Pp\ (blue open squares) data, compared to simulation (green-hatched histogram). The error bars represent statistical uncertainties. (See the text for more details).

(a) Single-muon transverse-momentum spectrum for $\abs{\eta^\Pgm}<$2.1 in PbPb data (red-filled circles). Signal (green-hatched histogram) and background (blue-dashed histogram) contributions are fitted (black solid line) to the data. (b) Mean value of \PTm\ for charged tracks as a function of centrality, before any event selection is applied on the muon-triggered data (black squares) and after it (red-filled circles), together with predictions from the \PYTHIA{}+\HYDJET samples (green triangles). (c) Transverse mass distribution for selected events in PbPb (red-filled circles) and \Pp\Pp\ (blue open squares) data, compared to simulation (green-hatched histogram). The error bars represent statistical uncertainties. (See the text for more details).

(a) Single-muon transverse-momentum spectrum for $\abs{\eta^\Pgm}<$2.1 in PbPb data (red-filled circles). Signal (green-hatched histogram) and background (blue-dashed histogram) contributions are fitted (black solid line) to the data. (b) Mean value of \PTm\ for charged tracks as a function of centrality, before any event selection is applied on the muon-triggered data (black squares) and after it (red-filled circles), together with predictions from the \PYTHIA{}+\HYDJET samples (green triangles). (c) Transverse mass distribution for selected events in PbPb (red-filled circles) and \Pp\Pp\ (blue open squares) data, compared to simulation (green-hatched histogram). The error bars represent statistical uncertainties. (See the text for more details).

Centrality dependence of normalised \PW $\rightarrow \mu \Pgngm$ cross sections $(1/T_\mathrm{AA}) (N_\PW/\Delta\eta)$ in PbPb collisions, for all \PW\ candidates (red-filled points) and, separated by charge, \PWp\ (violet-filled squares) and \PWm\ (green-filled stars). The open symbols at $N_\text{part} \approx 120 $ represent the MB events. At $N_\text{part} = 2$, the corresponding cross sections are displayed for \Pp\Pp\ collisions divided by $\Delta \eta$, for the same $\sqrt{s}$. For clarity, both \PWp\ and \PWm\ points are slightly shifted on the horizontal axis. The cross sections are given for the phase space region $|\eta^\Pgm|<2.1$ and $\pt^\Pgm > 25$\GeVc. The error bars represent the statistical, and the horizontal lines the systematic, uncertainties.

Charge asymmetry $(N_{\PWp} - N_{\PWm}) / (N_{\PWp} + N_{\PWm})$ as a function of muon pseudorapidity for PbPb (red-filled circles) and \Pp\Pp\ (blue open squares) collisions at $\sqrt{s} = 2.76\TeV$. Overlaid are predictions for \Pp\Pp\ collisions from \MCFM calculations with MSTW2008 PDF (blue solid curve), as well as expectations for PbPb collisions from \MCFM with MSTW2008 and EPS09 PDF, that include isospin and nuclear effects (red dashed curve). Each prediction has an additional uncertainty of 5\%, estimated by the uncertainty from the choice of PDF. The experimental points have an additional 1.1\% systematic uncertainty that is not shown in the figure. The dot-dashed horizontal line is drawn only for reference.