“Could charm (& τ) transitions be the ‘poor princess’ providing a deeper understanding of fundamental dynamics ?” or: “Finding novel forces”

Abstract

We know that our Universe is composed of only ∼ 4.5% "known" matter; therefore, our understanding is incomplete. This can be seen directly in the case of neutrino oscillations (without even considering potential other universes). Charm quarks have had considerable impact on our understanding of known matter, and quantum chromodynamics (QCD) is the only local quantum field theory to describe strong forces. It is possible to learn novel lessons concerning strong dynamics by measuring rates around the thresholds of [QQ] states with Q = b, c. Furthermore, these states provide us with gateways towards new dynamics (ND), where we must transition from "accuracy" to "precision" eras. Finally, we can make connections with τ transitions and, perhaps, with dark matter. Charm dynamics acts as a bridge between the worlds of light-and heavy-flavor hadrons (namely, beauty hadrons), and finding regional asymmetries in many-body final states may prove to be a "game changer". There are several different approaches to achieving these goals: for example, experiments such as the Super Tau-Charm Factory, Super Beauty Factory, and the Super Z 0 Factory act as gatekeepers -and deeper thinking regarding symmetries.

Weak decays of doubly heavy charm $$\Omega _{cc}^{+}$$ Ω cc + baryon

“…However, to establish the CP-symmetries one requires a huge amount of experimental data. Moreover, it would be a difficult task to establish CP-violation in charm baryon decays, as the CPsymmetries originating from the Standard Model are very small or even zero [91].…”

Direct CP violation in beauty and charm hadron decays

“…Even if, when compared to B decays, the available phase space is relatively small, there are many resonances with masses below the D mass, and usually the decay dynamics are very rich and with rather interesting interference patterns. CP violation effects may be enhanced in local regions and these local asymmetries can be higher than the phase-space integrated results [122,267,268].…”

Probing violation of CP & T invariance in the transitions of τ leptons

“…One example is the "Sect.5 Dynamics of τ leptons" in my Ref. [8] with a small comment about future regional asymmetries from Belle II (and a possible Super Tau-Charm Factory); I will come back to that. Furthermore, when I was producing my contribution to TAU2021, I had realized that my books about CP asymmetries [1,5] are short about τ lepton dynamics; in particular my 2021 book [1] than my 2009 one [5].…”

“…Actually, I can list comments about CP violation in e + e − → τ + τ − with polarized e − beams, see Rets. [8,11,12,14] or mentioned in Ref. [15].…”