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$Z$ boson production in $p+$Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV measured with the ATLAS detector

The ATLAS collaboration
Phys.Rev. C92 (2015) 044915, 2015

Abstract (data abstract)
The ATLAS Collaboration has measured the inclusive production of $Z$ bosons via their decays into electron and muon pairs in $p+$Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV at the Large Hadron Collider. The measurements are made using data corresponding to integrated luminosities of 29.4 nb$^{-1}$ and 28.1 nb$^{-1}$ for $Z \rightarrow ee$ and $Z \rightarrow \mu\mu$, respectively. The results from the two channels are consistent and combined to obtain a cross section times the $Z \rightarrow \ell\ell$ branching ratio, integrated over the rapidity region $|y^{*}_{Z}|<3.5$, of 139.8 $\pm$ 4.8 (stat.) $\pm$ 6.2 (syst.) $\pm$ 3.8 (lumi.) nb. Differential cross sections are presented as functions of the $Z$ boson rapidity and transverse momentum, and compared with models based on parton distributions both with and without nuclear corrections. The centrality dependence of $Z$ boson production in $p+$Pb collisions is measured and analyzed within the framework of a standard Glauber model and the model's extension for fluctuations of the underlying nucleon-nucleon scattering cross section.

  • Table 1

    Data from Figure 1


    The centrality bias factors derived from data as explained in the text. Model calculations shown in the Figure are found...

  • Table 2

    Data from Figures 3(a)&4(a)


    The differential $Z$ boson production cross section, $d\sigma/dy^\mathrm{*}_{Z}$, as a function of $Z$ boson rapidity in the center-of-mass frame $y^\mathrm{*}_{Z}$,...

  • Table 3

    Data from Figure 5(a)


    The differential cross section of $Z$ boson production multiplied by the Bjorken $x$ of the parton in the lead nucleus,...

  • Table 4

    Data from Figure 6(a)


    The differential cross section of $Z$ boson production scaled by 1/$p_\mathrm{T}^{Z}$, (1/$p_\mathrm{T}^{Z}$) $d\sigma /dp_\mathrm{T}^{Z}$, for $-3<y^\mathrm{*}_{Z}<2$.

  • Table 5

    Data from Figure 6(c)


    The differential cross section of $Z$ boson production scaled by 1/$p_\mathrm{T}^{Z}$, (1/$p_\mathrm{T}^{Z}$) $d\sigma /dp_\mathrm{T}^{Z}$, for $-2<y^\mathrm{*}_{Z}<0$ and $0<y^\mathrm{*}_{Z}<2.

  • Table 6

    Data from Figure 7


    Centrality bias corrected $Z$ boson yields per event for $-3<y^\mathrm{*}_{Z}<2$ scaled by by $\langle N_{coll}\rangle$. (To remove the centrality bias...

  • Table 7

    Data from Figure 9(a)


    The rapidity differential Z boson yields per event scaled by $\langle N_{coll}\rangle$ for three centrality ranges.

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