Resonances in radiative hyperon decays

B. Borasoy; B. R. Holstein

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Resonances in radiative hyperon decays

B. Borasoy, B. R. Holstein

High Energy Physics - Phenomenology · Submitted 22 Feb 1999

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim We find significant contributions to both the parity-conserving and parity-violating decay amplitudes and a large negative value for the asymmetry parameter in polarized Sigma^+ -> p gamma is found, in agreement with the experimental result alpha(p Sigma^+) = -0.76 +/- 0.08.

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What the abstract itself states, as probabilities: claims first 0.03 · states limitation 0.08 · human participants 0.01 · controlled comparison 0.03 · randomized assignment 0.01 · states quantitative result 0.97 · compares with prior results 0.82 · mentions code or data availability 0.01.

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The importance of resonances for the radiative hyperon decays is examined in the framework of chiral perturbation theory. Low lying baryon resonances are included into the effective theory and tree contributions to these decays are calculated. We find significant contributions to both the parity-conserving and parity-violating decay amplitudes and a large negative value for the asymmetry parameter in polarized Sigma^+ -> p gamma is found, in agreement with the experimental result alpha(p Sigma^+) = -0.76 +/- 0.08.

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#	sentence	role	the authors' own work	states the main conclusion	strength
s0	The importance of resonances for the radiative hyperon decays is examined in the framework of chiral perturbation theory.	contribution 0.58	0.58	0.05	unclear 0.62
s1	Low lying baryon resonances are included into the effective theory and tree contributions to these decays are calculated.	method 0.91	0.87	0.04	asserted 0.98
s2	We find significant contributions to both the parity-conserving and parity-violating decay amplitudes and a large negative value for the asymmetry parameter in polarized Sigma^+ -> p gamma is found, in agreement with the experimental result alpha(p Sigma^+) = -0.76 +/- 0.08.	result 1.00	0.96	0.87	asserted 1.00

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The paper

Original abstract

The importance of resonances for the radiative hyperon decays is examined in the framework of chiral perturbation theory. Low lying baryon resonances are included into the effective theory and tree contributions to these decays are calculated. We find significant contributions to both the parity-conserving and parity-violating decay amplitudes and a large negative value for the asymmetry parameter in polarized Sigma^+ -> p gamma is found, in agreement with the experimental result alpha(p Sigma^+) = -0.76 +/- 0.08.

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References

Forward citations

Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

Hyperon non-leptonic decays in relativistic Chiral Perturbation Theory with resonances
hep-ph 2026-04 unverdicted novelty 7.0 of 10

Relativistic ChPT at NLO with resonance saturation yields a good combined fit to hyperon non-leptonic s- and p-wave decay amplitudes.
Unraveling weak radiative hyperon decays with broken flavor symmetry
hep-ph 2026-08 conditional novelty 5.0 of 10

A broken-SU(3) fit with eight parameters reproduces the observed hyperon radiative decay data and predicts a sizable negative Xi- -> Sigma- gamma asymmetry that current data do not rule out.
Kinetic Mixing and Axial Charges in the Parity-Doublet Model
hep-ph 2025-12 unverdicted novelty 4.0 of 10

Kinetic mixing terms are introduced in the parity-doublet model to reproduce the empirical axial charge g_A ≈ 1.28 of the nucleon along with masses of the nucleon and N*(1535).
Herwig++ Physics and Manual
hep-ph 2008-03 conditional novelty 4.0 of 10

Herwig++ version 2.3 is documented as a complete simulation chain for lepton and hadron collisions, built on an angular-ordered parton shower with mass-dependent splitting functions, an eikonal multi-scatter underlyin...
Prospects for rare and forbidden hyperon decays at BESIII
hep-ex 2016-12 conditional novelty 3.0 of 10

BESIII's planned 10^10 J/psi sample would yield 10^6 to 10^8 hyperons and permit branching-fraction sensitivity of 10^-5 to 10^-8 on rare and forbidden hyperon decays.

How the literature uses it

6 arXiv papers cite this in 20 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

Papers citing it · 12 sentences without a confident label

Contests it 2 papers

None of the previous predictions in the pole models (PM) [ref] , the vector-dominance model (VDM) [ref] , the chiral perturbation theory ($χ$PT) [ref] , the broken SU(3) model [ref] , the quark model (QM) [ref] and the non-relativistic constituent quark model (NRCQM) [ref] can describe the new data.

Are we close to solving the puzzle of weak radiative hyperon decays? · Introduction · contest 0.92
For instance, the predicted decay parameters for $Ξ^0→Σ^0γ$ and $Ξ^0→Λγ$ in Ref. [ref] are 0.15 and 0.46, respectively, in sharp conflict with the latest experimental data.

Weak radiative hyperon decays in covariant baryon chiral perturbation theory · Introduction · contest 0.95

Compares with it 1 paper

Furthermore, we note that the results of the pole model (PM I) [ref] and $χ$PT at tree level [ref] are relatively closer to the new BESIII data.

Weak radiative hyperon decays in covariant baryon chiral perturbation theory · Introduction · 0.98

Cites it as support 1 paper

Certainly, our results give further credit to the suggestion of Ref. [ref] that such states are of crucial importance to understand the weak radiative decays of hyperons.

Hyperon non-leptonic decays in relativistic Chiral Perturbation Theory with resonances · Conclusion and outlook · 0.98

Cites it as background 2 papers

For a short introduction to these three methods, see, e.g., Ref. [ref] . $χPT$ has been applied to study the WRHDs in the covariant formulation [ref] and the heavy baryon formulation [ref] up to one-loop order and at tree level but considering the contribution of heavier resonances [ref] .

Weak radiative hyperon decays in covariant baryon chiral perturbation theory · Introduction · 0.94
Despite their simple two-body kinematics, these decays have long posed significant challenges to both theory and experiment [ref] .

Unraveling weak radiative hyperon decays with broken flavor symmetry · Introduction · 0.95

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