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Jul 26 – 30, 2021
Europe/Berlin timezone

CP-Violating Invariants in the SMEFT

Jul 26, 2021, 10:30 AM


Parallel session talk Flavour Physics and CP Violation T08: Flavour Physics and CP Violation


Emanuele Gendy (UNI/TH (Uni Hamburg, Institut fuer Theoretische Physik))


In the Standard Model, CP violation in the Electroweak sector is parametrized by the Jarlskog Invariant. This is the flavor invariant sensitive to CP violation with the least number of Yukawa matrices that can be built. When higher dimensional operators are allowed, and the Standard Model Effective Field Theory is constructed, numerous new sources for CP violation can appear. However, the description of CP violation as a collective effect, present in the SM, is inherited by its Effective extension. Here, I will discuss how such a behaviour can be consistently captured, at dimension 6, by flavor invariant, CP violating objects, linear in the Wilson coefficients. Such a description ensures that CP violation in the SMEFT is treated in a basis independent manner. In particular, I claim these are the objects that have to vanish, together with the SM Jarlskog Invariant, for CP to be conserved, and viceversa. The scaling properties of these invariants demonstrates that, while CP is not an accidental symmetry of the Standard Model, its breaking is accidentally small at the renormalizable level. Implications for specific flavor models, such as MFV, will be addressed.

First author Emanuele Gendy Abd El Sayed
Collaboration / Activity DESY

Primary authors

Emanuele Gendy (UNI/TH (Uni Hamburg, Institut fuer Theoretische Physik)) Christophe Grojean (DESY) Quentin Rene Christian Bonnefoy (T (Phenomenology)) Prof. Joshua Thomas Ruderman (NYU)

Presentation materials