Resonant ALP-portal dark matter annihilation as a solution to the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msup> <mml:mi>B</mml:mi> <mml:mo>±</mml:mo> </mml:msup> <mml:mo stretchy="false">→</mml:mo> <mml:msup> <mml:mi>K</mml:mi> <mml:mo>±</mml:mo> </mml:msup> <mml:mi>ν</mml:mi> <mml:mover accent="true"> <mml:mi>ν</mml:mi> <mml:mo stretchy="false">¯</mml:mo> </mml:mover> </mml:math> excess
Bibliographic record
Abstract
The Belle II collaboration recently reported a 2.7 σ excess in the rare decay B ± → K ± ν ν ¯ , potentially signaling new physics. We propose an axionlike particle (ALP)-portal dark matter (DM) framework to explain this anomaly while satisfying the observed DM relic abundance. By invoking a resonant annihilation mechanism ( m a ∼ 2 m χ ), we demonstrate that the ALP-mediated interactions between the Standard Model and DM sectors simultaneously account for the B ± → K ± ν ν ¯ anomaly and thermal freeze-out dynamics. Two distinct scenarios—long-lived ALPs decaying outside detectors (displaced diphotons) and ALPs decaying invisibly to DM pairs (missing energy)—are examined. While the displaced diphotons scenario is excluded by kaon decay bounds ( K ± → π ± + inv .), the invisible decay channel remains unconstrained and aligns with Belle II’s missing energy signature. Using the coupled Boltzmann equation formalism, we rigorously incorporate early kinetic decoupling effects, revealing deviations up to a factor of 20 from traditional relic density predictions in resonance regions. For the missing energy scenario, the viable parameter space features ALP–Standard Model (SM) and ALP-DM couplings: g a W W ( g a γ γ ) ∈ ( 7.13 × 10 − 5 – 9.60 × 10 − 5 ) GeV − 1 (from B ± → K ± a ) and g a χ χ ∈ ( 7.12 × 10 − 5 – 7.73 × 10 − 3 ) GeV − 1 (for resonant annihilation), accommodating ALP masses m a ∈ ( 0.6 , 4.8 ) GeV . Therefore, this work establishes the ALP portal as a viable bridge between the
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.002 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.004 | 0.002 |
| Open science | 0.002 | 0.003 |
| Research integrity | 0.002 | 0.003 |
| Insufficient payload (model declined to judge) | 0.022 | 0.006 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".