Nonleptonic Decays of Baryons and the Eightfold Way

Hara, Yasuo

doi:10.1103/physrevlett.12.378

Cited by 144 publications

(90 citation statements)

References 8 publications

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“…Some of the difficulty in explaining WRHD is because predictions using the quark model do not match predictions from an analysis at the hadron level [2]. Hara proved in 1964 that α = 0 in the SU(3) limit for the Σ + and Ξ − WRHD, assuming only CP invariance and U spin symmetry (s and d quark exchange symmetry) [3]. An estimate, based on single-quark s → d transitions and that takes into account SU(3) breaking predicts a modest positive asymmetry, with the magnitude depending on the assignment of quark masses [4].…”

Section: The Ktev Collaborationmentioning

confidence: 99%

Measurement of the Branching Ratio and Asymmetry of the DecayΞ°→Σ°γ

Alavi-Harati¹,

Alexopoulos²,

Arenton³

et al. 2001

Phys. Rev. Lett.

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The KTeV CollaborationWe have studied the rare weak radiative hyperon decay Ξ • → Σ • γ in the KTeV experiment at Fermilab. We have identified 4045 signal events over a background of 804 events. The dominant Ξ • → Λπ • decay, which was used for normalization, is the only important background source. An analysis of the acceptance of both modes yields a branching ratio ofBy analyzing the final state decay distributions, we have also determined that the Σ • emission asymmetry parameter for this decay is αΞΣ = −0.63 ± 0.09.

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Section: The Ktev Collaborationmentioning

confidence: 99%

Measurement of the Branching Ratio and Asymmetry of the DecayΞ°→Σ°γ

Alavi-Harati¹,

Alexopoulos²,

Arenton³

et al. 2001

Phys. Rev. Lett.

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“…The breaking of SU(3) in dynamical observables can be larger and up to now is not fully understood. One particularly striking example is the weak radiative decay Σ → pγ: the experimental azimuthal asymmetry in this decay is α γ = −0.76 ± 0.08 [3], which according to Hara's theorem [4] implies 100% SU(3) symmetry violation.…”

Section: Introductionmentioning

confidence: 99%

Higher-twist distribution amplitudes of the K meson in QCD

Ball

Braun

Lenz

2006

J. High Energy Phys.

394

640

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We present a systematic study of twist-3 and twist-4 light-cone distribution amplitudes of the K meson in QCD. The structure of SU(3)-breaking corrections is studied in detail. Non-perturbative input parameters are estimated from QCD sum rules and renormalons. As a by-product, we give a complete reanalysis of the twist-3 and -4 parameters of the π-meson distribution amplitudes; some of the results differ from those usually quoted in the literature.

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“…This constitutes Puzzle #1, since the soft-pion theorems [2] predict that f S = f P and (A) Hara's theorem [3] states that "Parityviolating Σ + → pγ amplitude must vanish in the SU (3) limit". Thus, with SU (3)-breaking effects expected to contribute at the 20% level, one anticipates small asymmetry |α(Σ + → pγ)| ≈ 0.2.…”

Section: The S : P Problemmentioning

confidence: 99%

Radiative and nonleptonic hyperon decays in broken SU(3)

Żenczykowski

2007

Nuclear Physics B - Proceedings Supplements

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We report on the recently proposed joint resolution of two long-standing puzzles in weak radiative (WR) and nonleptonic (NL) hyperon decays (HD). First, a good VMD-based description of WRHD is presented. In particular, the large negative asymmetry observed in the Σ + → pγ decay is explained through a calculably large SU(3)-breaking effect in the relevant parity-violating amplitude. Second, the achieved description of the parity-violating WRHD amplitudes permits the extraction, via the SU (2)W + VMD route, of the non-soft-pion correction term in the parity-violating NLHD amplitudes. The latter subtracts a substantial amount from the current-algebra commutator term, thus leading to the resolution of the old S : P discrepancy in NLHD.

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Nonleptonic Decays of Baryons and the Eightfold Way

Cited by 144 publications

References 8 publications

Measurement of the Branching Ratio and Asymmetry of the DecayΞ°→Σ°γ

Measurement of the Branching Ratio and Asymmetry of the DecayΞ°→Σ°γ

Higher-twist distribution amplitudes of the K meson in QCD

Radiative and nonleptonic hyperon decays in broken SU(3)

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