Würzburg 2018 – scientific programme
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T: Fachverband Teilchenphysik
T 84: Theorie: BSM II
T 84.6: Talk
Thursday, March 22, 2018, 17:45–18:00, Z6 - SR 1.010
Solving the Strong CP Problem in a Grand-Unified Nelson-Barr Model — •Jakob Schwichtenberg1, Paul Tremper1, and Robert Ziegler2 — 1Institut für Theoretische Teilchenphysik, Karlsruhe Institute of Technology, Karlsruhe, Germany — 2Theoretical Physics Department, CERN, Geneva, Switzerland
We investigate if the Nelson-Barr mechanism can be realized, in a phenomenologically viable way, in an E6 GUT. We find the answer in the affirmative and argue that the combination of the Nelson-Barr mechanism and E6 unification leads to predictions that can be tested in the near future. In this sense, we do not provide any novel solution for the strong CP problem, but rather use the experimental fact θ < 10−10 as a guide for GUT model building. While neither the Nelson-Barr mechanism, nor Grand Unification lead to definite predictions, we argue that a combination of these ideas does.