## Constraint from

Indirect CP violation in the Kaon system is usually expressed in terms of parameter which is the fraction of the CP violating component in the mass eigenstates and which is usually defined as:

where

Top and charm quarks contribute to the expression of the mixing in K0-K0 system. The calculation of the box diagram gives

where

which allows one to write

where

The expression actually used in the UT fit is obtained by writing in terms of and the other elements of CKM matrix:

The experimental values we use are summarized in the Table of Inputs. The representation of this constraint in the plane is given below.

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