Dark QCD perspective inspired by strong CP problem at QCD scale

by Bin Wang (Jilin University )

Friday 20 Dec 2024, 14:00 → 15:00 Asia/Shanghai

B105 (CHEP)

This talk will discuss a QCD-scale composite axion model arising from dark QCD coupled to QCD. The presently proposed scenario not only solves the strong CP problem, but also is compatible with the preheating setup for the QCD baryogenesis. Two axions are required for solving the strong-CP problem for both QCD and dark QCD. The composite axion is generically flavorful, and phenomenologically required to mimic the QCD pion. The lighter one is phenomenologically invisible PQ axion, to be a dark matter candidate. The QCD × dark QCD symmetry structure constrains dark QCD meson spectra, so that the dark η^'-like meson would only be accessible at the collider experiments. Still, the Belle II and EIC experiments can have a high enough sensitivity to probe the dark η^'-like meson in the diphoton channel, which dominantly arises from the mixing with the QCD η^' and the pionic composite axion. This talk will also briefly address nontrivial cosmological aspects, such as those related to the dark-chiral phase transition, the dark matter production, and an ultraviolet completion related to the ultralight ALP.

Biography: Bin Wang is currently a graduate student at Jilin University starting in 2022. His main research interests focus on particle physics with strong dynamics.