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

ATLAS measurements of $b$-jet suppression and heavy-flavor azimuthal correlations in 5.02 TeV Pb+Pb collisions

Sep 5, 2023, 9:30 AM
Ballroom F (Hilton of the Americas)

Ballroom F

Hilton of the Americas

Oral Jets Jets


Anne Marie Sickles (Univ. Illinois at Urbana Champaign (US))


The suppression of jets in heavy-ion collisions can provide detailed information about the hot, dense plasma formed in these collisions at the LHC. Jet quenching in heavy-ion collisions is expected to depend on the mass of the fragmenting parton. For light partons, energy loss via gluon bremsstrahlung is expected to dominate, while for heavy-quark-initiated jets, collisional energy loss may play a more important role. This energy loss mechanism can be studied by measuring differences in the suppression of $b$-tagged and inclusive jets in $pp$ and Pb+Pb collisions. Besides the $b$-tagged jet measurements, an alternative method for probing the interactions of heavy quarks with the plasma is the study of the correlations between heavy-quark pairs, which is sensitive to the relative importance of collisional versus radiative scattering processes. In this talk, we report new ATLAS measurements of $b$-tagged and inclusive jet production as well as the measurement of the yield of correlated muon pairs from heavy-flavor decays in Pb+Pb and $pp$ collisions at $\sqrt{s_\textrm{NN}}~=~5.02$~TeV. For $b$-tagged and inclusive jet, the transverse momentum distributions in Pb+Pb and $pp$ collisions, as well as the nuclear modification factors, $R_{AA}$, in Pb+Pb collisions, are presented together with comparisons to theoretical calculations. The measurement of correlated muon pairs from heavy-flavor decays includes per-event yields, scaled by the nuclear thickness function, $T_{AA} $ will be discussed. Detailed studies of how the shape of the correlation in azimuthal-angle separation between the two muons changes from peripheral to central Pb+Pb collisions and comparison to the corresponding measurements in $pp$ collisions are also presented.

Category Experiment
Collaboration (if applicable) ATLAS Collaboration

Primary author

Anne Marie Sickles (Univ. Illinois at Urbana Champaign (US))

Presentation materials