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Long Distance Contribution to $K_L \to \ell^+ \ell^-$

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abstract

We revisit the calculation of the long distance contribution to $K_L \to \mu^+ \mu^-$. We discuss this process within the framework of chiral perturbation theory, and also using simple models for the $K_L \gamma^* \gamma^*$ vertex. We argue that it is unlikely that this mode can be used to extract information on short distance parameters. The process $K_L \to e^+ e^-$ is also long-distance dominated and we find that $B(K_L \to e^+ e^-) \approx 9 \times 10^{-12}$.

fields

hep-ph 1

years

2025 1

verdicts

UNVERDICTED 1

representative citing papers

TeV Scale Quark-Lepton Unification

hep-ph · 2025-12-11 · unverdicted · novelty 6.0

A quark-lepton unified Pati-Salam model with Z2 symmetry realizes a leptoquark gauge boson as light as 4.3 TeV, compatible with LHC and flavor constraints, and predicts testable lepton flavor violation plus new vector-like quarks.

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Showing 1 of 1 citing paper.

  • TeV Scale Quark-Lepton Unification hep-ph · 2025-12-11 · unverdicted · none · ref 45 · internal anchor

    A quark-lepton unified Pati-Salam model with Z2 symmetry realizes a leptoquark gauge boson as light as 4.3 TeV, compatible with LHC and flavor constraints, and predicts testable lepton flavor violation plus new vector-like quarks.