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Measurement of Z$^0$-boson production at large rapidities in Pb-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV

The ALICE collaboration
Phys.Lett. B780 (2018) 372-383, 2018

Abstract (data abstract)
The production of Z-bosons at large rapidities in Pb-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV is reported. Z-boson candidates are reconstructed in the dimuon decay channel (${\rm Z}^{0} \rightarrow \mu^{+}\mu^{-}$), based on muons selected with pseudo-rapidity $-4.0<\eta_{\mu}<-2.5$ and $p_{\rm T}^\mu>20$ GeV/$c$. The invariant yield and the nuclear modification factor, $R_{AA}$, are presented as a function of rapidity and collision centrality. The value of $R_{\rm AA}$ for the 0-20% central Pb-Pb collisions is $0.67 \pm 0.11 \, \mbox{(stat.)} \, \pm 0.03 \, \mbox{(syst.)} \, \pm 0.06 \, \mbox{(corr. syst.)}$, exhibiting a deviation of $2.6 \sigma$ from unity. The results are well-described by calculations that include nuclear modifications of the parton distribution functions, while the predictions using vacuum PDFs deviate from data by $2.3\sigma$ in the 0-90% centrality class and by $3\sigma$ in the 0-20% central collisions.

  • Table 1

    Data from Figure 2

    10.17182/hepdata.82813.v1/t1

    Invariant yield of Z$^{0}$ production in 2.5 < y < 4.0 divided by the average nuclear overlap function in the...

  • Table 2

    Data from text

    10.17182/hepdata.82813.v1/t2

    Nuclear modification factor of Z$^{0}$ production in 2.5 < y < 4.0 in the 0-90% centrality class. The first uncertainty...

  • Table 3

    Data from Figure 3 (LEFT)

    10.17182/hepdata.82813.v1/t3

    Invariant yield of Z$^{0}$ production in 2.5 < y < 4.0 divided by the average nuclear overlap function as a...

  • Table 4

    Data from Figure 3 (RIGHT)

    10.17182/hepdata.82813.v1/t4

    Nuclear modification factor of Z$^{0}$ production as a function of rapidity in the 0-90% centrality class. The first uncertainty is...

  • Table 5

    Data from Figure 4 (LEFT)

    10.17182/hepdata.82813.v1/t5

    Invariant yield of Z$^{0}$ production in 2.5 < y < 4.0 divided by the average nuclear overlap function as a...

  • Table 6

    Data from Figure 4 (RIGHT)

    10.17182/hepdata.82813.v1/t6

    Nuclear modification factor of Z$^{0}$ production in 2.5 < y < 4.0 as a function of the average number of...

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