A Colorful Mirror Solution to the Strong CP Problem
Claudio Andrea Manzari (UC-Berkeley-LBNL) After introducing the strong CP problem, I will focus on its solutions where an exactly parity (P) symmetry emerges at short distances. I will present a new construction where P exchanges the entire Standard Model with its mirror copy and two new mass scales arise: v' where parity and mirror electroweak symmetry are spontaneously broken, and v3 where the color groups break to the diagonal strong interactions. The strong CP problem is solved even if v3<< v' and the breaking of P gives negligible contributions starting at three-loop order. Finally, I will discuss the energy scales of the model, its minimal realizations and the experimental signatures.