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

Abstract

Measurement of 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 is reported. It is performed in the dimuon decay channel, through the detection of muons with pseudorapidity $-4<{\eta }_{\mu }<-2.5$ and transverse momentum $p_{\mathrm{T}}^{\mu }>20$ GeV/$c$ in the laboratory frame. The invariant yield and nuclear modification factor are measured for opposite-sign dimuons with invariant mass $60<m^{\mu \mu }<120$ GeV$c^2$ and rapidity $2.5<y_{cms}^{\mu \mu }<4$. They are presented as a function of rapidity and, for the Pb-Pb collisions, of centrality as well. The results are compared with theoretical calculations, both with and without nuclear modifications to the Parton Distribution Functions (PDFs). In p-Pb collisions the center-of-mass frame is boosted with respect to the laboratory frame, and the measurements cover the backward ($-4.46<y_{cms}^{\mu \mu }<-2.96$) and forward ($2.03<y_{cms}^{\mu \mu }<3.53$) rapidity regions. For the p-Pb collisions, the results are consistent within experimental and theoretical uncertainties with calculations that include both free-nucleon and nuclear-modified PDFs. For the Pb-Pb collisions, a $3.4\sigma$ deviation is seen in the integrated yield between the data and calculations based on the free-nucleon PDFs, while good agreement is found once nuclear modifications are considered.

arXiv comment22 pages, 5 captioned figures, 2 tables, authors from page 17, published version, figures at http://alice-publications.web.cern.ch/node/6216

References in corpus (44)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• Parton distributions for the LHC
• New parton distributions for collider physics
• PDF4LHC recommendations for LHC Run II
• New parton distribution functions from a global analysis of quantum chromodynamics
• Parton distributions in the LHC era: MMHT 2014 PDFs
• Performance of the ALICE Experiment at the CERN LHC
• High-precision QCD at hadron colliders: electroweak gauge boson rapidity distributions at NNLO
• EPS09 - a New Generation of NLO and LO Nuclear Parton Distribution Functions
• Vector boson production at hadron colliders: a fully exclusive QCD calculation at NNLO
• FEWZ 2.0: A code for hadronic Z production at next-to-next-to-leading order
• nCTEQ15 - Global analysis of nuclear parton distributions with uncertainties in the CTEQ framework
• EPPS16: Nuclear parton distributions with LHC data
• NLO vector-boson production matched with shower in POWHEG
• Centrality determination of Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV with ALICE
• Performance of the ALICE VZERO system
• Alignment of the ALICE Inner Tracking System with cosmic-ray tracks
• Color singlet production at NNLO in MCFM
• Nuclear shadowing
• Rapidity and transverse momentum dependence of inclusive J/$\psi$ production in pp collisions at $\sqrt{s}=7$ TeV
• Proton-Nucleus Collisions at the LHC: Scientific Opportunities and Requirements
• Impact-parameter dependent nuclear parton distribution functions: EPS09s and EKS98s and their applications in nuclear hard processes
• Study of W boson production in PbPb and pp collisions at sqrt(s[NN]) = 2.76 TeV
• Study of Z boson production in PbPb collisions at nucleon-nucleon centre of mass energy = 2.76 TeV
• Measurement of Z boson Production in Pb+Pb Collisions at sqrt(s_NN)=2.76 TeV with the ATLAS Detector
• Constraints for the nuclear parton distributions from Z and W production at the LHC
• Measurement of the production and lepton charge asymmetry of $\text{W}$ bosons in Pb+Pb collisions at $\sqrt{s_{\mathbf{NN}}}=$ 2.76 TeV with the ATLAS detector
• Parton Distributions and the LHC: W and Z Production
• Initial transverse-momentum broadening of Breit-Wheeler process in relativistic heavy-ion collisions
• Observation of centrality-dependent acoplanarity for muon pairs produced via two-photon scattering in Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ATLAS detector
• $Z$ boson production in $p+$Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV measured with the ATLAS detector
• Study of Z boson production in pPb collisions at sqrt(s[NN]) = 5.02 TeV
• Observation of $Z$ production in proton-lead collisions at LHCb
• Study of Z production in PbPb and pp collisions at sqrt(s[NN]) = 2.76 TeV in the dimuon and dielectron decay channels
• Shadowing Effects on Vector Boson Production
• Observation of nuclear modifications in W${}^{\pm }$ boson production in pPb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 8.16 TeV
• W and Z boson production in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Vector boson production in proton-lead and lead-lead collisions at the LHC and its impact on nCTEQ15 PDFs
• Measurements of $W$ and $Z$ boson production in $pp$ collisions at $\sqrt{s}=5.02$ TeV with the ATLAS detector
• $Z$ boson production in Pb+Pb collisions at $\sqrt{s_{\text{NN}}}$= 5.02 TeV measured by the ATLAS experiment
• Measurement of Z${}^0$-boson production at large rapidities in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• The physics potential of proton-nucleus collisions at the TeV scale
• Global analysis of nuclear parton distribution functions at leading and next-to-leading order perturbative QCD

Cited by in corpus (10)

• The ALICE experiment: a journey through QCD
• ${\rm Y}$ production and nuclear modification at forward rapidity in Pb-Pb collisions at $\sqrt{{\text{s}}_{\text{NN}}}=5.02$ TeV
• Strong constraints on jet quenching in centrality-dependent $p$+Pb collisions at 5.02 TeV from ATLAS
• $\psi (2S)$ suppression in Pb-Pb collisions at the LHC
• Constraints on the initial state of PbPb collisions via measurements of Z boson yields and azimuthal anisotropy at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV
• Study of Drell-Yan dimuon production in proton-lead collisions at $\sqrt{s_{\mathrm{NN}}}=$ 8.16 TeV
• High-energy neutrino deep inelastic scattering cross sections
• Electroweak-boson production from small to large collision systems with ALICE at the LHC
• EPPS21: A global QCD analysis of nuclear PDFs
• Electroweak-boson production in p-Pb and Pb-Pb collisions at the LHC with ALICE