Z boson production in Pb+Pb collisions at sNN=5.02 TeV measured by the ATLAS experiment

Nuclear parton distributions from lepton-nucleus scattering and the impact of an electron-ion collider

“…In fact, until a few years ago, most nPDF analyses [17][18][19][20][21][22] were largely based on fixed-target DIS structure functions in lepton-nucleus scattering (with kinematic coverage restricted to x ∼ > 0.01) supplemented by some Drell-Yan cross-sections. A major improvement in this respect has been the recent availability of data on hard-scattering cross-sections from proton-lead collisions at the LHC, with processes ranging from jet [23][24][25][26][27] and electroweak boson production [28][29][30][31][32], to heavy quark production [33][34][35][36][37][38][39][40] among several others. Indeed, measurements of hard probes in p+Pb collisions provide useful information to constrain the nPDFs, as was demonstrated by a few recent studies [41,42].…”

Z-boson production in p-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}} $$ = 8.16 TeV and Pb-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}} $$ = 5.02 TeV

“…The production of electroweak bosons at the LHC has already been studied in several collision systems, at various energies and rapidities [19][20][21][22][23][24][25][26][27][28][29][30][31][32]. At midrapidity, the data in different collision systems are generally well described by theoretical calculations both with and without nuclear modification of the PDFs [21][22][23][24][25][26][27][28][29][30][31]. In fact, the covered Bjorken-x range at midrapidity extends over the antishadowing and shadowing region (depending on the transition value, even into the EMC region).…”

Measurements of electroweak-boson-tagged jet energy loss and modification by ATLAS

“…Z boson candidates were reconstructed in a way similar to that in the previous measurement of their yield in 2015 Pb+Pb collision data [5]. Z bosons were identified through their di-muon and di-electron decay channels by selecting two opposite-charge-sign leptons, which were required to pass identification criteria and have p T > 20 GeV.…”