High Energy Physics - Phenomenology · arXiv:hep-ph/0510122 v1 · submitted 10 Oct 2005
Two pole structure of the Lambda(1405) resonance
The paper says
“The data of these two experiments, together with the present theoretical analysis, provides for the first time a clear experimental evidence of the two pole structure of the Lambda(1405).”
from the abstract · picked out as the main claim by a classifier
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The paper
Abstract
The K^- p –> pi^0 pi^0 Sigma^0 reaction is studied within a chiral unitary model. The distribution of pi^0 Sigma^0 states forming the Lambda(1405) shows, in agreement with a recent experiment, a peak at 1420 MeV and a relatively narrow width of 38 MeV. This reaction gives maximal possible weight to the second Lambda(1405) state found in chiral unitary theories, which is narrow and of higher energy than the nominal Lambda(1405). In contrast, the pi^- p –> K^0 pi Sigma reaction gives more weight to the pole at lower energy and with a larger width. The data of these two experiments, together with the present theoretical analysis, provides for the first time a clear experimental evidence of the two pole structure of the Lambda(1405).
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abstract compiled · 2026-09-23 · no language-model review
How the main claim is stated: asserted 1.00
What the abstract itself states, as probabilities: claims first 0.83 · states limitation 0.08 · human participants 0.02 · controlled comparison 0.05 · randomized assignment 0.01 · states quantitative result 0.98 · compares with prior results 0.91 · mentions code or data availability 0.02
The abstract, sentence by sentence
This table labels the abstract only (arXiv listing abstract v1). The number is the probability the classifier gave the label.
| Sentence | Role | The authors' own work | States the main conclusion | Strength |
|---|---|---|---|---|
| The K^- p --> pi^0 pi^0 Sigma^0 reaction is studied within a chiral unitary model. | contribution 0.68 | 0.82 | 0.02 | asserted 0.89 |
| The distribution of pi^0 Sigma^0 states forming the Lambda(1405) shows, in agreement with a recent experiment, a peak at 1420 MeV and a relatively narrow width of 38 MeV. | result 1.00 | 0.58 | 0.14 | asserted 0.99 |
| This reaction gives maximal possible weight to the second Lambda(1405) state found in chiral unitary theories, which is narrow and of higher energy than the nominal Lambda(1405). | interpretation 0.83 | 0.46 | 0.22 | asserted 1.00 |
| In contrast, the pi^- p --> K^0 pi Sigma reaction gives more weight to the pole at lower energy and with a larger width. | result 0.91 | 0.47 | 0.06 | asserted 0.99 |
| The data of these two experiments, together with the present theoretical analysis, provides for the first time a clear experimental evidence of the two pole structure of the Lambda(1405). | interpretation 0.64 | 0.72 | 0.93 | asserted 1.00 |
What kind of paper the classifier reports this is: theoretical result 0.86 · evidence from analysis of existing data 0.73
What was examined, and what was not
Sources read
- arXiv listing abstract v1
Not examined
- full text
- figures and tables
- references and citing sentences
- relations to other papers
Levels run
- P abstract
Not run
- S sections
- T body sentences
- C citations
- R cross-paper relations
How the labels were made
Compiled by classifier-1.13-20260917 via OpenRouter, question bank abstract-p1-20260923, 2026-09-23: 1 request, 4,351 input tokens, $0.0002 reported.
Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. This record as JSON
How the literature uses it
Papers whose main result relates to this one's
States the same result 2 papers
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The data of these two experiments, together with the present theoretical analysis, provides a firm evidence of the two pole structure of the Lambda(1405).
Evidence for the two pole structure of the Lambda(1405) resonance · 1.00
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We use these data in combination with those of the $\pi^- p \to K^0 \pi \Sigma$ reaction and elements of chiral unitary theory to prove that there are two $\Lambda(1405)$ states instead of one as so far assumed.
States a conflicting result 1 paper
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Detailed analysis reveals single-pole nature of the observable Lambda (1405).
Single-pole nature of Lambda (1405) and structure of K-pp · 0.98
Challenges and discussion
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