Theory

# Theory seminar: Joachim Brod

Europe/Amsterdam
Nikhef

#### Nikhef

Description
Precision Standard-Model Prediction of epsilon_K

The parameter epsilon_K describes CP violation in the neutral kaon
system and is one of the most sensitive probes of new physics. The large
uncertainties related to the charm-quark contribution to epsilon_K have
so far prevented a reliable standard-model prediction. In this talk, I
will review mixing in the neutral kaon system, and then show that CKM
unitarity suggests a unique form of the weak effective Hamiltonian in
which the short-distance theory uncertainty of the imaginary part is
dramatically reduced. The uncertainty related to the charm-quark
contribution is now at the percent level. I will conclude with an
outlook on further calculations that have the potential to render
epsilon_K a precision observable on par with the rare kaon decays.


Passcode: g#F!472Z