Abstract
We analyse the structure of long distance (LD) contributions to the CP-violating parameter ε{lunate}K, that generally affect both the absorptive (Γ12) and the dispersive (M12) parts of the K0 - over(K, ̄)0 mixing amplitude. We point out that, in a consistent framework, in addition to LD contributions to Im Γ12, estimated recently by two of us, also LD contributions to Im M12 have to be taken into account. Estimating the latter contributions the impact of LD effects on ε{lunate}K is significantly reduced (from -6.0% to -3.6%). The overall effect of LD corrections and of the superweak phase being different from 45° is summarised by the multiplicative factor κε{lunate} = 0.94 ± 0.02.
Original language | English |
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Pages (from-to) | 309-313 |
Number of pages | 5 |
Journal | Physics Letters B |
Volume | 688 |
Issue number | 4-5 |
DOIs | |
State | Published - 10 May 2010 |
Keywords
- CP violation
- Effective theories
- K mesons
- Standard Model