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      Top-quark spin properties at LHC

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          Abstract

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

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          Journal
          17 April 2024
          Article
          2404.11452
          d1f67186-9180-4b2b-9b66-6f2b8219dd20

          http://creativecommons.org/licenses/by/4.0/

          History
          Custom metadata
          Presented at the 12th Workshop on the CKM Unitarity Triangle, 18-22 September 2023, Santiago de Compostela
          hep-ex

          High energy & Particle physics
          High energy & Particle physics

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