The puzzle of the quark model: Weak radiative hyperon decays

Żenczykowski, P.

doi:10.1016/0920-5632(96)00393-3

Cited by 6 publications

(5 citation statements)

References 12 publications

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“…The Ξ 0 → Λγ decay asymmetry plays an important role in solving a long standing discrepancy between the Hara theorem [1] and the observed decay asymmetries of weak radiative hyperon decays [2,3]. The Hara theorem states that the parityviolating amplitude of weak radiative hyperon decays vanishes in the SU(3) limit.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the Ξ0→Λγ decay asymmetry and branching fraction

Lai

Marras

Bevan³

et al. 2004

Physics Letters B

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In data taken with the NA48 experiment at the CERN SPS in 1999, 730 candidates of the weak radiative hyperon decay Ξ 0 → Λγ have been found with an estimated background of 58 ± 8 events. From these events the Ξ 0 → Λγ decay asymmetry has been determined to α(Ξ 0 → Λγ ) = −0.78 ± 0.18 stat ± 0.06 syst , which is the first evidence of a decay asymmetry in Ξ 0 → Λγ . The branching fraction of the decay has been measured to be Br(Ξ 0 → Λγ ) = (1.16 ± 0.05 stat ± 0.06 syst ) × 10 −3 .

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Section: Introductionmentioning

confidence: 99%

Measurement of the Ξ0→Λγ decay asymmetry and branching fraction

Lai

Marras

Bevan³

et al. 2004

Physics Letters B

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“…This is due to the requirement of the mode orbital excitations between the spatial wavefunctions of and in association with the spin-flavor operators in Eq. (7), which are nonvanishing between and modes. As a consequence, the two terms in Eq.…”

Section: N(1650) Pγmentioning

confidence: 99%

“…There is an abundant amount of literature regarding theoretical efforts to understand the physics behind the Hara theorem and the experimental observations. A unified theory was proposed by Zenczykowski et al [5][6][7][8][9][10][11][12], who combined the SU (6) symmetry with the vector meson dominance for the study of the hyperon weak radiative decays. It was shown in Refs.…”

Section: Introduction J/ψ J/ψmentioning

confidence: 99%

Hyperon weak radiative decay *

Niu¹,

Richard²,

Wang³

et al. 2021

Chinese Phys. C

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We revisit the hyperon weak radiative decays in the framework of the non-relativistic constituent quark model. This study confirms the nonlocal feature of the hyperon weak radiative transition operators, which are dominated by the pole terms, and an overall self-consistent description of the available experimental data for the Cabibbo-favored hyperon weak radiative decays is presented. It provides a natural mechanism for evading the Hara theorem, where sizeable parity-violating contributions can come from the intermediate orbital excitations. Cancellations between pole terms also explain the significant SU(3) flavor symmetry breaking manifested by the experimental data. We also discuss several interesting selection rules arising from either the electromagnetic or the weak interaction vertices. These features suggest nontrivial relations among various hyperon decays.

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“…The Ξ 0 → Λγ decay asymmetry plays an important role in solving a long standing discrepancy between the Hara theorem [14] and the observed decay asymmetries of weak radiative hyperon decays (see [15,16] on this argument). The Hara theorem states that the parity violating amplitude of weak radiative hyperon decays vanishes in the SU(3) limit.…”

Section: ξ 0 Radiative Decaysmentioning

confidence: 99%