Norman Christ

activity

20142026

most citedProspects for a lattice computation of rare kaon decay amplitudes:

K \to π ℓ^{+} ℓ^{-}

decays

41 citations · 42 across the 8 of their papers we have counts for

collaborators

8 papers

hep-lat2026

First Lattice QCD Determination of Lepton-Flavor-Universality Ratios in Light-Meson Leptonic Decays

Peter Boyle, Norman H. Christ, Xu Feng +4

The ratio of electronic to muonic leptonic decay widths, $R_{e / μ}$ , for the light mesons $π$ and $K$ , provides a clean test of lepton flavor universality (LFU) and a sensitive prob…

hep-lat2026

Renormalizing a three-flavor lattice calculation of the two-photon contribution to $K_{L} \to μ^{+} μ^{-}$

En-Hung Chao, Norman Christ, Ceran Hu

The Standard Model prediction for the rare $K_{L} \to μ^{+} μ^{-}$ decay depends critically on the long-distance contribution coming from the exchange of two photons. Such a contribution ca…

hep-lat2025

Lattice Calculation of Light Meson Radiative Leptonic Decays

Peter Boyle, Norman H. Christ, Xu Feng +4

In this work, we perform a lattice QCD calculation of the branching ratios and the form factors of radiative leptonic decays $P \to ℓ ν_{ℓ} γ$ ( $P = π, K$ ) using $N_{f} = 2 + 1$ doma…

hep-lat2025

An exploratory calculation of $K_{L} \to μ^{+} μ^{-}$ decay from Lattice QCD at physical pion mass

Peter Boyle, En-Hung Chao, Norman Christ +3

We compute the complex, long-distance two-photon-exchange amplitude which contributes to the rare $K_{L} \to μ^{+} μ^{-}$ decay from lattice QCD. We use a $2 4^{3} \times 64$ phys…

hep-ph2025

Kaon Physics: A Cornerstone for Future Discoveries

Jason Aebischer, Atakan Tugberk Akmete, Riccardo Aliberti +153

The kaon physics programme, long heralded as a cutting-edge frontier by the European Strategy for Particle Physics, continues to stand at the intersection of discovery and innovati…

hep-ph2024

Calculating the two-photon exchange contribution to $K_{L} \to μ^{+} μ^{-}$ decay

En-Hung Chao, Norman Christ

We present a theoretical framework within which both the real and imaginary parts of the complex, two-photon exchange amplitude contributing to $K_{L} \to μ^{+} μ^{-}$ decay can be…

hep-lat2015★ 41 cited

Prospects for a lattice computation of rare kaon decay amplitudes: $K \to π ℓ^{+} ℓ^{-}$ decays

N. H. Christ, X. Feng, A. Portelli +1

The rare kaon decays $K \to π ℓ^{+} ℓ^{-}$ and $K \to π ν ν ˉ$ are flavor changing neutral current (FCNC) processes and hence promising channels with which to probe the limits of the s…

hep-lat2014★ 1 cited

Finite-volume effects in the evaluation of the K_L - K_S mass difference

N. H. Christ, G. Martinelli, C. T. Sachrajda

The RBC and UKQCD collaborations have recently proposed a procedure for computing the K_L-K_S mass difference. A necessary ingredient of this procedure is the calculation of the (n…

First Lattice QCD Determination of Lepton-Flavor-Universality Ratios in Light-Meson Leptonic Decays

Renormalizing a three-flavor lattice calculation of the two-photon contribution to KL​→μ+μ−