Publicação
Search for the jet-induced diffusion wake in the quark-gluon plasma via measurements of jet-track correlations in photon-jet events in Pb plus Pb collisions at √sNN=5.02 TeV with the ATLAS detector
| Resumo: | This paper presents a measurement of jet-track correlations in photon-jet events, using \( 1.72 \text{ nb}^{-1} \) of Pb+Pb data at \( \sqrt{s_{NN}} = 5.02 \text{TeV} \) recorded with the ATLAS detector at the LHC. Events with energetic photon-jet pairs are selected, where the photon and jet are approximately back-to-back in azimuth. The angular correlation between jets and charged-particle tracks with transverse momentum (\( p_T \)) in the range 0.5–2.0 GeV in the hemisphere opposite to the jet, \( |\Delta \phi(\text{jet,track})| > \pi/2 \), is measured as a function of their relative pseudorapidity difference, \( |\Delta \eta(\text{jet,track})| \). In central Pb+Pb collisions, these correlations are predicted to be sensitive to the diffusion wake in the quark-gluon plasma resulting from the lost energy of high-\( p_T \) partons traversing the plasma, with a characteristic modification as a function of \( |\Delta \eta(\text{jet,track})| \). The correlations are examined with different selections on the jet-to-photon \( p_T \) ratio to select events with different degrees of energy loss. No diffusion wake signal is observed within the current sensitivity and upper limits at 95\% confidence level on the diffusion wake amplitude are reported. |
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| Autores principais: | Castro, Nuno Filipe |
| Outros Autores: | Onofre, A.; ATLAS Collaboration |
| Assunto: | Ciências Naturais::Ciências Físicas |
| Ano: | 2025 |
| País: | Portugal |
| Tipo de documento: | artigo |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade do Minho |
| Idioma: | inglês |
| Origem: | RepositóriUM - Universidade do Minho |
| Resumo: | This paper presents a measurement of jet-track correlations in photon-jet events, using \( 1.72 \text{ nb}^{-1} \) of Pb+Pb data at \( \sqrt{s_{NN}} = 5.02 \text{TeV} \) recorded with the ATLAS detector at the LHC. Events with energetic photon-jet pairs are selected, where the photon and jet are approximately back-to-back in azimuth. The angular correlation between jets and charged-particle tracks with transverse momentum (\( p_T \)) in the range 0.5–2.0 GeV in the hemisphere opposite to the jet, \( |\Delta \phi(\text{jet,track})| > \pi/2 \), is measured as a function of their relative pseudorapidity difference, \( |\Delta \eta(\text{jet,track})| \). In central Pb+Pb collisions, these correlations are predicted to be sensitive to the diffusion wake in the quark-gluon plasma resulting from the lost energy of high-\( p_T \) partons traversing the plasma, with a characteristic modification as a function of \( |\Delta \eta(\text{jet,track})| \). The correlations are examined with different selections on the jet-to-photon \( p_T \) ratio to select events with different degrees of energy loss. No diffusion wake signal is observed within the current sensitivity and upper limits at 95\% confidence level on the diffusion wake amplitude are reported. |
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