Ultrahigh-Energy Event KM3-230213A within the Global Neutrino Landscape
Why this work is in the frame
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Bibliographic record
Abstract
On February 13th, 2023, the KM3NeT/ARCA telescope detected a neutrino candidate with an estimated energy in the hundreds of PeV. In this article, the observation of this ultrahigh-energy neutrino is discussed in light of null observations above tens of PeV from the IceCube and Pierre Auger observatories. Performing a joint fit of all experiments under the assumption of an isotropic <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"> <a:msup> <a:mi>E</a:mi> <a:mrow> <a:mo>−</a:mo> <a:mn>2</a:mn> </a:mrow> </a:msup> </a:math> flux, the best-fit single-flavor flux normalization is <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"> <c:mrow> <c:msup> <c:mrow> <c:mi>E</c:mi> </c:mrow> <c:mrow> <c:mn>2</c:mn> </c:mrow> </c:msup> <c:msubsup> <c:mrow> <c:mi mathvariant="normal">Φ</c:mi> </c:mrow> <c:mrow> <c:mi>ν</c:mi> <c:mo>+</c:mo> <c:mover accent="true"> <c:mrow> <c:mi>ν</c:mi> </c:mrow> <c:mrow> <c:mo stretchy="false">¯</c:mo> </c:mrow> </c:mover> </c:mrow> <c:mrow> <c:mn>1</c:mn> <c:mi mathvariant="normal">f</c:mi> </c:mrow> </c:msubsup> <c:mo>=</c:mo> <c:mn>7.5</c:mn> <c:mo>×</c:mo> <c:msup> <c:mrow> <c:mn>10</c:mn> </c:mrow> <c:mrow> <c:mo>−</c:mo> <c:mn>10</c:mn> </c:mrow> </c:msup> <c:mtext> </c:mtext> <c:mtext> </c:mtext> <c:mi>GeV</c:mi> <c:mtext> </c:mtext> <c:msup> <c:mrow> <c:mi>cm</c:mi> </c:mrow> <c:mrow> <c:mo>−</c:mo> <c:mn>2</c:mn> </c:mrow> </c:msup> <c:mtext> </c:mtext> <c:msup> <c:mrow> <c:mi mathvariant="normal">s</c:mi> </c:mrow> <c:mrow> <c:mo>−</c:mo> <c:mn>1</c:mn> </c:mrow> </c:msup> <c:mtext> </c:mtext> <c:msup> <c:mrow> <c:mi>sr</c:mi> </c:mrow> <c:mrow> <c:mo>−</c:mo> <c:mn>1</c:mn> </c:mrow> </c:msup> </c:mrow> </c:math> in the 90% energy range of the KM3NeT event. Furthermore, the ultrahigh-energy data are then fit together with the IceCube measurements at lower energies, either with a single power law or with a broken power law, allowing for the presence of a new component in the spectrum. A slight preference for a break in the PeV regime is found for one of the three investigated IceCube samples and no such preference for the other two. In all cases, the observed tension between KM3NeT and other datasets is mild to moderate ( <j:math xmlns:j="http://www.w3.org/1998/Math/MathML" display="inline"> <j:mrow> <j:mn>1.6</j:mn> <j:mi>σ</j:mi> <j:mi>–</j:mi> <j:mn>2.9</j:mn> <j:mi>σ</j:mi> </j:mrow> </j:math> ), and increased statistics are required to resolve this apparent tension and better characterize the neutrino landscape at ultrahigh energies.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
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 it