Speaker
Description
Top quarks, the heaviest elementary particles carrying colour charges, are considered to be attractive candidates for probing the quark-gluon plasma pro- duced in relativistic lead-lead collisions. In proton-lead collisions, top-quark production is expected to be sensitive to nuclear modifications of parton distri- bution functions at high Bjorken-x values. In Run 2, the ATLAS experiment recorded 165 nb−1 of proton-lead data and 1.9 nb−1 of lead-lead data at centre- of-mass energy of 8.16 TeV and 5.02 TeV per nucleon pair, respectively. In this poster, we present the final measurement of the top-quark pair production in dilepton and lepton+jet decay modes in the proton-lead system with the ATLAS detector. The precision of the analysis requires detailed performance studies in- volving electrons, muons, jets and b-quark jets. A profile-likelihood approach is used to extract signal significance. The nuclear modification factor is also measured. The results are compared to theory predictions involving state-of- the-art nuclear parton distribution functions. Prospects for the top-quark pair measurement in lead-lead collisions are also presented.
| Category | Experiment |
|---|---|
| Collaboration | ATLAS |
