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Sep 3 – 9, 2023
Hilton of the Americas, 1600 Lamar, Houston, Texas, 77010, USA
US/Central timezone

Dijet imbalance for jets of various radii in Pb+Pb and $pp$ collisions with the ATLAS detector

Sep 9, 2023, 11:10 AM
Ballroom of the Americas

Ballroom of the Americas

Oral Jets Flash Talks


Anabel Romero (Univ. Illinois at Urbana Champaign (US))


Measurements of dijets that traverse a quark-gluon plasma can provide insights into the jet energy loss in heavy ion collisions. Furthermore, considering jets of various sizes can help elucidate how the parton energy is transferred to the medium as well as the medium response. Measurements of the dijet momentum imbalance and nuclear modification factors for leading and subleading jet pairs were obtained using data from the ATLAS detector at the LHC. These measurements used 1.72 $nb^{-1}$ of Pb+Pb data collected in 2018, and 260 $pb^{-1}$ of $pp$ data collected in 2017, both at $\sqrt{s_{NN}} = 5.02$~TeV. Jets were reconstructed with the anti-$k_T$ algorithm using radii $R$=0.2, 0.3, 0.5, and 0.6, and were compared to previous results using $R$=0.4. The measurements were unfolded in the leading and subleading jet $p_\mathrm{T}$ to correct for the jet energy resolution. These measurements will improve the understanding of the jet energy loss process.

Category Experiment
Collaboration (if applicable) ATLAS Collaboration

Primary author

Anabel Romero (Univ. Illinois at Urbana Champaign (US))

Presentation materials