| Solving the Strong CP Problem without an axion |
| Claudio Andrea Manzari, UC Berkeley |
| Event Type: HEP Seminar |
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| Time: 2:00 PM - 3:15 PM |
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| Location: 726 Broadway, 940, CCPP Seminar |
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| Abstract: After introducing the strong CP problem, I will focus on its solutions where a parity (P) or charge-conjugation composed with parity (CP) symmetry emerges at short distances. I will present two new simple constructions that can explain the extremely small size of the strong CP angle.
In the first one P exchanges the entire Standard Model with its mirror copy and two new mass scales arise: the scale where parity and mirror electroweak symmetry are spontaneously broken, and the scale where the color groups break to the diagonal subgroup, identified with QCD.
The second one is a 3 Higgs doublet model equipped with a U(1) global flavor symmetry. I will show that a soft breaking of CP and the flavor symmetry are enough to reproduce the SM at low energies without reintroducing the strong CP problem.
I will discuss the energy scales of these models, their phenomenology and the possible connections with other puzzles of particle physics. Link to the Event Video |