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| CMS-PAS-HIN-21-019 | ||
| First measurement of jet axis decorrelation with photon-tagged jets in pp and PbPb collisions at 5.02 TeV | ||
| CMS Collaboration | ||
| 18 July 2024 | ||
| Abstract: A search for medium-induced jet transverse momentum broadening is performed with isolated photon-tagged jet events in proton-proton (pp) and lead-lead (PbPb) collisions at nucleon-nucleon center-of-mass energy 5.02 TeV. The difference between jet axes as determined via energy-weight and winner-take-all clustering schemes, also known as the decorrelation of jet axes and denoted $ \Delta j $, is measured for the first time in photon-tagged jet events. This observable is sensitive to both multiple scattering and large-angle scattering effects in the quark gluon plasma. The pp and PbPb data samples were recorded with the CMS detector at the LHC and correspond to integrated luminosities of 1.69 nb$ ^{-1} $ and 302 pb$ ^{-1} $, respectively. Events are required to have a leading isolated photon with 60 $ < \mathrm{p}_{\mathrm{T}}^{\gamma} < $ 200 GeV, which is correlated with anti-$ \mathrm{k}_\mathrm{T} R = $ 0.3 jets with 30 $ < \mathrm{p_{T}^{jet}} < $ 100 GeV opposite in azimuthal angle. Event selection on colorless high-$ \mathrm{p_{T}} $ photons reduces the medium-induced survivor bias present in inclusive jet measurements of $ \Delta j $. The PbPb results are reported as a function of collision centrality and compared to pp reference data. Jets with $ \mathrm{p_{T}^{jet}} < $ 60 GeV have shapes for pp and PbPb which are consistent with each other. However, jets with $ \mathrm{p_{T}^{jet}} > $ 60 GeV in central PbPb show signs of narrowing relative to pp. The results are compared to the Jewel, Pyquen, and Hybrid theoretical models, which include different methods of energy loss. | ||
| Links: CDS record (PDF) ; Physics Briefing ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
Photon-tagged jet axis decorrelation $ \Delta{j} $ in pp collisions with 30 $ < p_{\mathrm{T}}^{\mathrm{jet}} < $ 60 GeV (left) and 60 $ < p_{\mathrm{T}}^{\mathrm{jet}} < $ 100 GeV (right), normalized per photon. The shaded boxes represent the systematic uncertainties, and the vertical bars indicate the statistical uncertainties. The results are compared to theoretical predictions from the Hybrid model and the event generators Jewel, Pyquen, and Pythia. The theory uncertainty bands represent the statistical uncertainties. |
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Figure 2:
Photon-tagged jet axis decorrelation $ \Delta{j} $ in pp collisions (red, open circles) and PbPb collisions (blue, filled circles) with 30 $ < p_{\mathrm{T}}^{\mathrm{jet}} < $ 60 GeV (top) and 60 $ < p_{\mathrm{T}}^{\mathrm{jet}} < $ 100 GeV (bottom), normalized per photon. The shaded boxes represent systematic uncertainties, and the vertical bars indicate statistical uncertainties. The $ \mathrm{PbPb} $ results are presented for four centrality intervals: 0-10%, 10-30%, 30-50%, and 50-90%. |
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Figure 3:
Photon-tagged jet axis decorrelation $ \Delta{j} $ in PbPb collisions with 0-10% centrality, normalized per photon. The shaded boxes represent systematic uncertainties, and the vertical bars indicate statistical uncertainties. The results are compared to theoretical predictions from Hybrid and the event generators Jewel and Pyquen. The theory uncertainty bands represent the statistical uncertainties. |
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Figure 3-a:
Photon-tagged jet axis decorrelation $ \Delta{j} $ in PbPb collisions with 0-10% centrality, normalized per photon. The shaded boxes represent systematic uncertainties, and the vertical bars indicate statistical uncertainties. The results are compared to theoretical predictions from Hybrid and the event generators Jewel and Pyquen. The theory uncertainty bands represent the statistical uncertainties. |
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Figure 3-b:
Photon-tagged jet axis decorrelation $ \Delta{j} $ in PbPb collisions with 0-10% centrality, normalized per photon. The shaded boxes represent systematic uncertainties, and the vertical bars indicate statistical uncertainties. The results are compared to theoretical predictions from Hybrid and the event generators Jewel and Pyquen. The theory uncertainty bands represent the statistical uncertainties. |
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Figure 4:
Ratios of photon-tagged jet $ \Delta{j} $ spectra in PbPb and pp collisions normalized per photon-jet pair. The shaded boxes represent total systematic uncertainties, and the vertical bars indicate statistical uncertainties. The $ \mathrm{PbPb} $ results are presented for four centrality intervals: 0-10%, 10-30%, 30-50%, and 50-90%. |
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Figure 5:
Ratio of photon-tagged jet axis decorrelation in PbPb and pp collisions normalized per photon+jet pair, shown for centrality 0-10%. The shaded boxes represent systematic uncertainties, and the vertical bars indicate statistical uncertainties. The results are compared to theoretical predictions from Hybrid and the event generators Jewel and Pyquen. The theory uncertainty bands represent the statistical uncertainties. |
png pdf |
Figure 5-a:
Ratio of photon-tagged jet axis decorrelation in PbPb and pp collisions normalized per photon+jet pair, shown for centrality 0-10%. The shaded boxes represent systematic uncertainties, and the vertical bars indicate statistical uncertainties. The results are compared to theoretical predictions from Hybrid and the event generators Jewel and Pyquen. The theory uncertainty bands represent the statistical uncertainties. |
png pdf |
Figure 5-b:
Ratio of photon-tagged jet axis decorrelation in PbPb and pp collisions normalized per photon+jet pair, shown for centrality 0-10%. The shaded boxes represent systematic uncertainties, and the vertical bars indicate statistical uncertainties. The results are compared to theoretical predictions from Hybrid and the event generators Jewel and Pyquen. The theory uncertainty bands represent the statistical uncertainties. |
| Tables | |
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Table 1:
Summary of absolute systematic uncertainties for 30 $ < p_{\mathrm{T}}^{\mathrm{jet}} < $ 60 GeV, averaged over the $ \Delta{j} $ distributions. |
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Table 2:
Summary of absolute systematic uncertainties for 60 $ < p_{\mathrm{T}}^{\mathrm{jet}} < $ 100 GeV, averaged over the $ \Delta{j} $ distributions. |
| Summary |
| Measurements of the photon-tagged jet axis decorrelation, between jet axes defined by the energy weight (E-Scheme) and the winner-take-all (WTA) schemes, are reported for the first time at nucleon-nucleon center-of-mass energy $ \sqrt{\smash[b]{s_{_{\mathrm{NN}}}}} = $ 5.02 TeV, using proton-proton (pp) and lead-lead (PbPb) data sets recorded by the CMS experiment at the CERN Large Hadron Collider in 2017 and 2018, respectively. This study uses comparisons with pp results to investigate the in-medium modification of the $ \Delta{j} $ distribution in PbPb collisions. The corrected $ \Delta{j} $ spectra are analyzed for four centrality intervals: 0-10%, 10-30%, 30-50%, and 50-90%. The use of photon-tagged jet events reduces the jet selection bias and allows a focus on a quark-enriched sample with the initial transverse momentum tagged by the photon, which leads to fewer competing effects compared to inclusive jet-based measurements and enables study of jet bias effects. The data is divided into lower- and higher-$ p_{\mathrm{T}} $ jet intervals to explore the effects of jet bias. In contrast with the narrowing effects observed in the ALICE inclusive charged jet measurement at small $ \Delta{j} $, where PbPb to pp spectra ratios go as high as 1.5, the CMS results indicate that the PbPb and pp spectra for 30 $ < p_{\mathrm{T}}^{\mathrm{jet}} < $ 60 GeV are consistent with a central value of 1. However, the CMS measurement does see the same signs of narrowing at small $ \Delta{j} $ as observed in ALICE for the higher-$ p_{\mathrm{T}} $ jet sample, from 60 $ < p_{\mathrm{T}}^{\mathrm{jet}} < $ 100 GeV, which has a larger jet bias effect. Quantitative analysis of the PbPb to pp spectra shape ratios shows general consistency with unity within the quoted statistical and systematic uncertainties, except in central collisions for jets $ > $ 60 GeV, which show signs of narrowing. The Jewel model indicates that the $ \Delta{j} $ observable is relatively insensitive to the QGP medium recoil effects, providing a reasonable description of the experimental data. The data is also consistent with the small signs of broadening predicted by the Jewel model at large $ \Delta{j} $ at low jet $ p_{\mathrm{T}} $ and the narrowing seen at small $ \Delta{j} $ at high jet $ p_{\mathrm{T}} $ in the most central collisions. The Hybrid model also indicates that the $ \Delta{j} $ observable is relatively insensitive to the QGP wake contribution, but indicates it is highly sensitive to elastic scattering of partons with the QGP. The PYQUEN model, however, vastly overpredicts medium-induced broadening effects; inclusion of wide-angle radiation only slightly improves its agreement with data. This jet axis decorrelation measurement provides new insights into the underlying mechanisms of jet quenching in the QGP. |
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