Comparison of inclusive and photon-tagged jet suppression in 5.02 TeV Pb+Pb collisions with ATLAS
| Autor: | ATLAS Collaboration |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
transverse momentum [photon]
jet [quark] heavy ion: scattering jet: suppression momentum spectrum [transverse momentum] jet: transverse momentum transverse momentum dependence transverse momentum [jet] transverse momentum: momentum spectrum scattering [heavy ion] jet [gluon] gluon: jet parton 5020 GeV-cms/nucleon quark: jet impact parameter: dependence quark gluon: plasma suppression [jet] plasma [quark gluon] dependence [impact parameter] nuclear matter: effect photon: transverse momentum ATLAS CERN LHC Coll energy loss [jet] jet: energy loss effect [nuclear matter] experimental results |
| DOI: | 10.3204/pubdb-2022-06531 |
| Popis: | 16 pp. (2022). This note presents a measurement of photon-tagged jet energy loss in the quark-gluon plasma, using 1.7 nb$^{-1}$ of Pb+Pb data and 260 pb$^{-1}$ of $pp$ data, both at 5.02 TeV, with the ATLAS detector. The process $pp \to \gamma$+jet+$X$ and its analogue in Pb+Pb events is measured in events with a $p_\mathrm{T}^\gamma > 50$ GeV isolated photon and reported as a function of jet $p_\mathrm{T}$. This selection results in a sample of jets with a steeply falling $p_\mathrm{T}$ distribution, similar to that for inclusive jets but with a different fraction of quark and gluon-initiated jets. The nuclear modification factor, $R_\mathrm{AA}$, is reported as a function of jet $p_\mathrm{T}$ and Pb+Pb event centrality, and compared to theoretical predictions. The $R_\mathrm{AA}$ for photon-tagged jets is measured to be significantly higher than that previously measured for inclusive jets, demonstrating that energy loss in the QGP is sensitive to the color-charge of the initiating parton. |
| Databáze: | OpenAIRE |
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