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Study of jet quenching with isolated-photon+jet correlations in PbPb and pp collisions at $\sqrt{s_{_{\mathrm{NN}}}} =$ 5.02 TeV

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arxiv 1711.09738 v2 pith:G6N5BRSJ submitted 2017-11-27 nucl-ex hep-ex

CMS Collaboration This is my paper
classification nucl-exhep-ex
keywords mathrmcollisionspbpbdatagammaphotonassociatedazimuthal
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

Measurements of azimuthal angle and transverse momentum ($p_\mathrm{T}$) correlations of isolated photons and associated jets are reported for pp and PbPb collisions at $\sqrt{s_{_{\mathrm{NN}}}} =$ 5.02 TeV. The data were recorded with the CMS detector at the CERN LHC. For events containing a leading isolated photon with $p_\mathrm{T}^\gamma >$ 40 GeV$/c$ and an associated jet with $p_\mathrm{T}^\text{jet} >$ 30 GeV$/c$, the photon+jet azimuthal correlation and $p_\mathrm{T}$ imbalance in PbPb collisions are studied as functions of collision centrality and $p_\mathrm{T}^\gamma$. The results are compared to pp reference data collected at the same collision energy and to predictions from several theoretical models for parton energy loss. No evidence of broadening of the photon+jet azimuthal correlations is observed, while the ratio $p_\mathrm{T}^\text{jet}/p_\mathrm{T}^\gamma$ decreases significantly for PbPb data relative to the pp reference. All models considered agree within uncertainties with the data. The number of associated jets per photon with $p_\mathrm{T}^\gamma >$ 80 GeV$/c$ is observed to be shifted towards lower $p_\mathrm{T}^\text{jet}$ values in central PbPb collisions compared to pp collisions.

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Forward citations

Cited by 4 Pith papers

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

  1. Measurement of forward jet suppression in Pb+Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$$ TeV with the ATLAS detector

    nucl-ex 2026-08 accept novelty 6.0 of 10

    First measurement of jet suppression at forward rapidity in heavy-ion collisions shows strong centrality-dependent suppression of jet yields.

  2. High-Dimensional Unfolding in Large Backgrounds

    hep-ph 2025-07 conditional novelty 6.0 of 10

    OmniFold-HI, an ML unfolding algorithm that handles large backgrounds and high-dimensional auxiliary observables, is derived, shown equivalent to iterative Bayesian unfolding, and demonstrated to improve jet-substruct...

  3. Measurement of isolated photon plus two-jet correlations in Pb+Pb and $pp$ collisions at 5.02 TeV with ATLAS

    nucl-ex 2026-06 unverdicted novelty 5.0 of 10

    ATLAS reports significant suppression (I_AA < 1) of photon-tagged two-jet yields in Pb+Pb versus pp collisions at 5.02 TeV across three observables, compared to JEWEL, JETSCAPE, and LBT models.

  4. Interplay of prompt and non-prompt photons in photon-triggered jet observables

    hep-ph 2025-07 conditional novelty 4.0 of 10

    Including isolated non-prompt (bremsstrahlung) photons in JETSCAPE simulations improves agreement with measured photon-jet asymmetry and azimuthal correlations in pp and Pb-Pb collisions at 5.02 TeV.

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