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arxiv: 1907.05616 · v1 · pith:7LFJUG2Tnew · submitted 2019-07-12 · ✦ hep-ph

Theory perspectives on rare Kaon decays and CPV

Giancarlo D'Ambrosio This is my paper

Pith reviewed 2026-05-24 22:39 UTC · model grok-4.3

classification ✦ hep-ph
keywords rare kaon decaysCP violationnew physicsB anomalieskaon physicsLHCb measurements
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The pith

Rare kaon decays like K to pi nu nu bar can probe new physics in direct CP violation and its link to B anomalies.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper reviews rare kaon decays from a theory viewpoint in the LHC era. It emphasizes that very rare processes such as K to pi nu nu bar are central for testing possible new physics in direct CP violation within K to 2 pi decays. The review connects these decays to observed tensions in B meson decays and incorporates recent LHCb data on K0 to mu+ mu-. A reader would care because these channels offer independent flavor probes that could clarify whether new physics explains multiple anomalies at once.

Core claim

Very rare kaon decays like K to pi nu nu bar are very important to probe New Physics in direct CP violation in K to 2 pi and the interplay with B anomalies.

What carries the argument

Branching ratios of rare kaon decays, especially K to pi nu nu bar, serving as precision observables for new physics contributions to CP violation.

Load-bearing premise

Precision measurements of these rare decays can isolate new physics effects from standard model predictions without needing model-specific assumptions about the new physics form.

What would settle it

A measurement of the K to pi nu nu bar branching ratio that exactly matches the standard model expectation with no deviation, even while B anomalies persist.

Figures

Figures reproduced from arXiv: 1907.05616 by Giancarlo D'Ambrosio.

Figure 2
Figure 2. Figure 2: FIG. 2: RS scenario to explain B-anomalies: [PITH_FULL_IMAGE:figures/full_fig_p001_2.png] view at source ↗
Figure 1
Figure 1. Figure 1: FIG. 1 [PITH_FULL_IMAGE:figures/full_fig_p001_1.png] view at source ↗
Figure 3
Figure 3. Figure 3: FIG. 3: Susy scenario [PITH_FULL_IMAGE:figures/full_fig_p002_3.png] view at source ↗
Figure 4
Figure 4. Figure 4: FIG. 4 [PITH_FULL_IMAGE:figures/full_fig_p002_4.png] view at source ↗
Figure 5
Figure 5. Figure 5: FIG. 5: The evolution of [PITH_FULL_IMAGE:figures/full_fig_p004_5.png] view at source ↗
read the original abstract

The following proceedings contain a theory perspective on rare Kaon decays. I review rare kaon decays in the LHC era: we discuss interplay with B-anomalies and possible New Physics in direct CP violation in $K\to 2\pi$: very rare kaon decays like $K \to \pi \nu \bar{\nu}$ are very important to this purpose. We discuss also the decays $K^0 \to \mu ^+ \mu ^-$ due to the LHCB measurement

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Referee Report

0 major / 2 minor

Summary. The manuscript is a short proceedings review offering theory perspectives on rare kaon decays in the LHC era. It summarizes the interplay between these decays (particularly K → π ν ν̄) and B anomalies, the potential for New Physics in direct CP violation in K → 2π, and the status of K⁰ → μ⁺ μ⁻ in light of LHCb measurements.

Significance. The review provides a compact overview connecting rare kaon observables to broader New Physics searches. Its value lies in contextualizing existing literature rather than advancing new derivations, predictions, or model-independent results.

minor comments (2)
  1. The abstract and text contain the abbreviation 'LHCB'; standard notation is LHCb.
  2. As a proceedings contribution, the manuscript would benefit from a brief concluding paragraph that explicitly lists the key open questions or experimental targets highlighted in the review.

Simulated Author's Rebuttal

0 responses · 0 unresolved

We thank the referee for the positive review and the recommendation to accept the manuscript. The report accurately captures the scope of this short proceedings contribution as a theory perspective connecting rare kaon decays to B anomalies and CP violation in the LHC era.

Circularity Check

0 steps flagged

No significant circularity

full rationale

The paper is a short proceedings review that summarizes existing theory perspectives on rare kaon decays and their relation to B anomalies and CP violation. It advances no new quantitative claims, derivations, equations, predictions, or fitted parameters. No load-bearing steps exist that could reduce to self-citation chains, self-definitions, or fitted inputs renamed as predictions. The document is self-contained as a perspective summary against external benchmarks.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The review rests on standard assumptions of the Standard Model and the sensitivity of rare decays to New Physics; no new free parameters, axioms, or invented entities are introduced in the abstract.

axioms (2)
  • domain assumption Standard Model governs the baseline predictions for kaon decays
    The paper discusses deviations and New Physics on top of SM expectations.
  • domain assumption Rare kaon decays can probe New Physics effects
    Central premise for the importance of the reviewed modes.

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discussion (0)

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Reference graph

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