XIII International Conference on Kaon Physics -- Kaon 2025 Mainz

Session

CP, T & CPT

10 Sept 2025, 11:00

Alte Mensa (Johannes Gutenberg University Mainz)

76. Electric Dipole Moments

Joachim Brod (University of Cincinnati)

10/09/2025, 11:00

CP, T, and CPT

Oral Contribution

I briefly review electric dipole moments as precision tests of CP violation. I will discuss the complementarity to LHC constraints in an effective theory framework, and present some recent results in the two-Higgs doublet model

33. RI-(S)MOM to MS-bar Conversion for B̂_K at Two-loop Order

Sandra Kvedaraite (University of Granada)

10/09/2025, 11:25

CP, T, and CPT

Oral Contribution

The Kaon bag parameter, $\hat{B}_K$, is a key non-perturbative ingredient in the search for new physics through CP-violation. It parameterizes the QCD hadronic matrix element of the effective weak $\Delta S = 2$ four-quark operator which can be computed non-perturbatively on the lattice. In this talk I will present the conversion factors for $\hat{B}_K$ between the RI-(S)MOM and the...

68. The "back from the future" quantum effect in entangled neutral kaons at KLOE/KLOE-2

Antonio Di Domenico (Sapienza Universita e INFN, Roma I (IT))

10/09/2025, 11:45

CP, T, and CPT

Oral Contribution

A novel quantum phenomenon associated to
a peculiar time correlation between entangled neutral kaons produced at a 𝜙-factory is discussed: the past state of the first decayed kaon, when it was still entangled before its decay,
is post-tagged by the result and the time of the future observation on the other kaon decay.
This surprising “back from the future” effect is fully observable and...

71. Updates on CP symmetry tests at KLOE-2

Szymon Gamrat

10/09/2025, 12:05

CP, T, and CPT

Oral Contribution

Measurement of $K_S\to3\pi^0$ decay branching ratio and determination of the ratio of amplitudes for $K_S\to3\pi^0$ to $K_L\to3\pi^0$ characterizes the CP violation. The 2013 KLOE results are now being updated with the usage of the KLOE-2 data sample increasing the available statistics to 5fb$^{-1}$. In this talk the status of the data analysis will be presented.

The ratio of strengths of...

34. New proposal to search for T-violating μ+ polarization in K+ ➞ π0 μ+ ν decays using stopped kaons

Suguru Shimizu (University of Osaka)

10/09/2025, 12:25

CP, T, and CPT

Oral Contribution

Time reversal symmetry has long been a subject of interest from pre-modern physics time, since it implies the reversibility of motion. In the $K^+ \to π^0 \mu^+ \nu$ ($K_{\mu3}$) decay, the transverse muon polarization ($P_T$) is defined as the polarization component perpendicular to the decay plane. A non-vanishing value of $P_T$ provides clear evidence for T-violation under the condition...