Measurement of substructure-dependent suppression of large-radius jets with charged particles in Pb+Pb collisions with ATLAS
Journal Article
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· Physics Letters. B
Measurements of jet substructure in Pb+Pb collisions provide key insights into the mechanism of jet quenching in the hot and dense QCD medium created in these collisions. This Letter presents a measurement of the suppression of large-radius jets with a radius parameter of $R = 1.0$ and its dependence on the jet substructure. The measurement uses 1.72 nb$$^{-1}$$ of Pb+Pb data and 255 pb$$^{-1}$$ of $pp$ data, both at $$\sqrt{s_{_\mathrm{NN}}} = 5.02$$ TeV, recorded with the ATLAS detector at the Large Hadron Collider. Large-radius jets are reconstructed by reclustering $R = 0.2$ calorimetric jets and are measured for transverse momentum above $200$ GeV. Jet substructure is evaluated using charged-particle tracks, and the overall level of jet suppression is quantified using the jet nuclear modification factor ($$R_\mathrm{AA}$$). The jet $$R_\mathrm{AA}$$ is measured as a function of jet $$p_{\mathrm{T}}$$, the charged $$k_t$$ splitting scale ($$\sqrt{d_{12}}$$), and the angular separation ($$dR_{12}$$) of two leading sub-jets. The jet $$R_\mathrm{AA}$$ gradually decreases with increasing $$\sqrt{d_{12}}$$, implying significantly stronger suppression of large-radius jets with larger $$k_t$$ splitting scale. The jet $$R_\mathrm{AA}$$ gradually decreases for $$dR_{12}$$ in the range $$0.01{-}0.2$$ and then remains consistent with a constant for $$ΔR_{12} \gtrsim 0.2$$. The observed significant dependence of jet suppression on the jet substructure will provide new insights into its role in the quenching process.
- Research Organization:
- Columbia University, New York, NY (United States); Univ. of Colorado, Boulder, CO (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- Contributing Organization:
- ATLAS Collaboration
- Grant/Contract Number:
- AC02-76SF00515; FG02-03ER41244; FG02-86ER40281
- OSTI ID:
- 3004974
- Alternate ID(s):
- OSTI ID: 3020343
- Report Number(s):
- arXiv:2504.04805
- Journal Information:
- Physics Letters. B, Journal Name: Physics Letters. B Vol. 871; ISSN 0370-2693
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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Measurement of Suppression of Large-Radius Jets and Its Dependence on Substructure in Pb+Pb Collisions at $\sqrt{s_{NN}}$ = 5.02 TeV with the ATLAS Detector
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