Top-quark spin properties at LHC

• DOI: 10.48550/arxiv.2404.11452
• Publication Date: 2024-04-17
• Authors: N. Bruscino
• Keywords: High Energy Physics - Experiment (hep-ex); FOS: Physical sciences; High Energy Physics - Experiment

Due to its high mass top quarks decay before top-flavoured hadrons can be formed. This feature yields experimental access the quark polarization and production asymmetries. The large sample moreover enables measurements of other properties, such as W-boson branching ratios helicity, fragmentation functions bottom quarks. In this contribution, recent top-quark spin properties at LHC are presented, including in particular first evidence charge asymmetry $t\bar{t}$ (ATLAS), a boosted regime (CMS) measurement $t\bar{t}+W$ (ATLAS).