Multiprocess imaging of nuclear modifications on parton distributions in proton-nucleus collisions

Abstract

Nuclear modifications to collinear parton distribution functions are conventionally quantified by the ratios $r_i^{\text{A}}(x,Q^2)=f_i^{\text{A,proton}}(x,Q^2)/f_i^{\text{proton}}(x,Q^2)$. For a given nucleus $A$, these ratios generally depend on the parton momentum fraction $x$, the probing scale $Q^2$, and the parton species $i$. Determining these dependencies relies on a global analysis of diverse experimental data. However, in realistic observables, these dependencies are intricately intertwined, making their extraction challenging. In this paper, we propose a novel approach to effectively image the nuclear modification factors $r_i^{\text{A}}(x,Q^2)$ at the observable level in proton-nucleus collisions at the Large Hadron Collider. Specifically, through a combined study of $Z$-boson production, $Z$+jet production, and $Z+c$-jet production, we separately enhance signals arising from light-quark, gluon, and heavy-flavor (charm) distributions in nuclei. This enables us to effectively image the $r_i^{\text{A}}(x,Q^2)$ for specific parton species. The feasibility of this method is validated through perturbative calculations at next-to-leading order in the strong coupling constant, employing three sets of nuclear PDF parametrizations: EPPS21, nCTEQ15, and TUJU19. Future measurements of these observables are expected to provide more efficient constraints on nuclear PDFs and yield new insights into the detailed partonic structures of nuclei.

11 pages, 8 figures

References in corpus (22)

• EPS09 - a New Generation of NLO and LO Nuclear Parton Distribution Functions
• Vector boson pair production at the LHC
• Determination of nuclear parton distribution functions and their uncertainties at next-to-leading order
• 50 Years of Quantum Chromodynamics
• Modified Structure of Protons and Neutrons in Correlated Pairs
• Parton Distributions in Nucleons and Nuclei
• Prompt and nonprompt J/$\psi$ production and nuclear modification in $p$Pb collisions at $\sqrt{s_{\text{NN}}}=8.16$ TeV
• The physics of $Z^0/{\gamma }^{\ast }$-tagged jets at the LHC
• Probing the Short-Distance Structure of the Quark-Gluon Plasma with Energy Correlators
• Nuclear PDFs After the First Decade of LHC Data
• NNLO nuclear parton distribution functions with electroweak-boson production data from the LHC
• Top-quark production in proton-nucleus and nucleus-nucleus collisions at LHC energies and beyond
• Study of W and Z Boson Production in Proton-Lead Collisions at the LHC with KP Nuclear Parton Distributions
• Compatibility of Neutrino DIS Data and Its Impact on Nuclear Parton Distribution Functions
• Productions of $Z^0$ and $W^{+}/W^{-}$ in Relativistic Heavy-Ion Collisions at the LHC
• Measurement of photonuclear jet production in ultra-peripheral Pb+Pb collisions at $\sqrt{s_{\text{NN}}}=5.02$ TeV with the ATLAS detector
• Transverse momentum balance of dijets in Xe+Xe collisions at the LHC
• Impact of Inclusive Electron Ion Collider Data on Collinear Parton Distributions
• Observation of $t\bar{t}$ production in the lepton+jets and dilepton channels in $p$+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=8.16$ TeV with the ATLAS detector
• Off-shell effects in bound nucleons and parton distributions from ${}^1$H, ${}^2$H, ${}^3$H and ${}^3$He data
• Measurement of inclusive charged-particle jet production in pp and p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Imaging nuclear modifications on parton distributions with triple-differential dijet cross sections in proton-nucleus collisions