Semileptonic kaon decays and the precise determination of $V_{us}$

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Auteur principal: Seng, Chien-Yeah
Format: Preprint
Publié: 2025
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author Seng, Chien-Yeah
author_facet Seng, Chien-Yeah
contents I will give a brief overview of the Standard Model theory inputs needed for the precise determination of the Cabibbo-Kobayashi-Maskawa matrix element $V_{us}$ from semileptonic kaon decays, focusing on the long-distance electromagnetic corrections. I will then describe our recent effort to pin down this correction at sub-permille level, which further sharpens the so-called ``Cabibbo angle anomaly'', an interesting observation which may point towards new physics.
format Preprint
id arxiv_https___arxiv_org_abs_2502_04721
institution arXiv
publishDate 2025
record_format arxiv
spellingShingle Semileptonic kaon decays and the precise determination of $V_{us}$
Seng, Chien-Yeah
High Energy Physics - Phenomenology
High Energy Physics - Experiment
High Energy Physics - Lattice
I will give a brief overview of the Standard Model theory inputs needed for the precise determination of the Cabibbo-Kobayashi-Maskawa matrix element $V_{us}$ from semileptonic kaon decays, focusing on the long-distance electromagnetic corrections. I will then describe our recent effort to pin down this correction at sub-permille level, which further sharpens the so-called ``Cabibbo angle anomaly'', an interesting observation which may point towards new physics.
title Semileptonic kaon decays and the precise determination of $V_{us}$
topic High Energy Physics - Phenomenology
High Energy Physics - Experiment
High Energy Physics - Lattice
url https://arxiv.org/abs/2502.04721