Pomeriggio tematico sul Toponio

Europe/Rome
Aula Conversi (Dip. di Fisica - Edificio G. Marconi)

Aula Conversi

Dip. di Fisica - Edificio G. Marconi

    • 16:00 16:40
      Intro teorica 40m
      Speaker: Antonio Davide Polosa (Istituto Nazionale di Fisica Nucleare)
    • 16:45 17:30
      Spot on the tt̄ threshold: quasi-bound states or BSM Physics? 45m

      Recent measurements by CMS and ATLAS at the LHC have independently revealed an intriguing excess near the top quark–antiquark production threshold. In this seminar, I will present the CMS analysis in the dileptonic channel based on the full Run II dataset. The observed excess is compatible with contributions from a short-lived ¹S₀ quasi-bound state (“toponium”), but can also be interpreted in terms of heavy scalar or pseudoscalar resonances. A comparison with the ATLAS result and prospects for clarifying the origin of this enhancement in future measurements will be discussed.

      Speaker: Alexander Grohsjean (Deutsches Elektronen Synchrotron)