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Two-particle azimuthal correlations in photonuclear ultraperipheral Pb+Pb collisions at 5.02 TeV with ATLAS

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arxiv 2101.10771 v2 pith:FURSJD2J submitted 2021-01-26 nucl-ex hep-ex

classification nucl-exhep-ex
keywords collisionsphotonuclearcharged-particletwo-particleatlasazimuthalcalorimeterscoefficients
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

Two-particle long-range azimuthal correlations are measured in photonuclear collisions using 1.7 nb$^{-1}$ of 5.02 TeV Pb+Pb collision data collected by the ATLAS experiment at the LHC. Candidate events are selected using a dedicated high-multiplicity photonuclear event trigger, a combination of information from the zero-degree calorimeters and forward calorimeters, and from pseudorapidity gaps constructed using calorimeter energy clusters and charged-particle tracks. Distributions of event properties are compared between data and Monte Carlo simulations of photonuclear processes. Two-particle correlation functions are formed using charged-particle tracks in the selected events, and a template-fitting method is employed to subtract the non-flow contribution to the correlation. Significant nonzero values of the second- and third-order flow coefficients are observed and presented as a function of charged-particle multiplicity and transverse momentum. The results are compared with flow coefficients obtained in proton-proton and proton-lead collisions in similar multiplicity ranges, and with theoretical expectations. The unique initial conditions present in this measurement provide a new way to probe the origin of the collective signatures previously observed only in hadronic collisions.

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Forward citations

Cited by 7 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Nonflow Subtraction Beyond Two-Particle Correlations

    nucl-th 2026-06 unverdicted novelty 7.0 of 10

    A nonflow subtraction framework for m-particle cumulants is developed and tested in HIJING simulations for O+O and d+Au collisions.

  2. Observation of impact parameter dependent modifications of nuclear parton distributions in photonuclear Pb+Pb collisions at $\sqrt{s_\mathrm{NN}} = 5.02$ TeV with the ATLAS detector

    nucl-ex 2026-04 unverdicted novelty 6.0 of 10

    ATLAS reports a 6 sigma observation that nuclear parton distribution modifications in photonuclear Pb+Pb collisions depend on impact parameter, shown by differing cross-section shapes versus x+ with and without forwar...

  3. Measurement of jet quenching in O+O collisions at $\sqrt{s_\mathrm{NN}}=200$ GeV by the STAR experiment at RHIC

    nucl-ex 2026-04 unverdicted novelty 6.0 of 10

    STAR reports 20% suppression of recoiling hadrons and jets in high-event-activity O+O collisions at 200 GeV, with a measured 0.7 GeV/c pT shift for large-radius jets, providing evidence for jet quenching in small systems.

  4. Femtoscopy-driven searches for saturated gluonic matter in inclusive photonuclear processes

    hep-ph 2026-06 unverdicted novelty 5.0 of 10

    Femtoscopy is presented as a method to isolate gluon saturation and nuclear shadowing effects via space-time structure in photonuclear collisions.

  5. Characterization of nuclear breakup as a function of hard-scattering kinematics using dijets measured by ATLAS in $p$+Pb collisions

    nucl-ex 2025-04 unverdicted novelty 4.0 of 10

    Dijet-tagged p+Pb collisions at 8.16 TeV show that Pb-going FCal transverse energy is approximately six times more sensitive to proton Bjorken-x than ZDC energy deposition.

  6. Few is different: deciphering many-body dynamics in mesoscopic quantum gases

    cond-mat.quant-gas 2025-09 unverdicted novelty 3.0 of 10

    A workshop report mapping the size, equilibrium, and interaction frontiers of hydrodynamic behavior in mesoscopic quantum systems, connecting few-atom Fermi gases and high-energy small collision systems.

  7. Ultra-peripheral Collisions

    hep-ex 2026-07 conditional novelty 1.0 of 10

    Ultra-peripheral collisions of heavy ions are reviewed as the energy frontier for photon physics; the paper consolidates a decade of LHC/RHIC results and proposes no new measurement.

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