Dynamical generation of hyperon resonances

Ramos, À.; Bennhold, C.; Oller, J. A.; Meißner, Ulf G.

doi:10.1016/j.nuclphysa.2005.01.003

Cited by 4 publications

(2 citation statements)

References 29 publications

(52 reference statements)

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“…[21], in which the couplings of the Λ(1670) to the meson-baryon state have already been determined (see table 1 of Ref. [42] for values of the couplings in isospin basis). Thus, because the photon couplings to the mesons and baryons are given by the chiral Lagrangian, there are no free parameters and the helicity amplitudes of the Λ(1670) are pure predictions.…”

Section: Introductionmentioning

confidence: 99%

Helicity amplitudes of the $ \Lambda$(1670) and two $ \Lambda$(1405) as dynamically generated resonances

Döring

Oset

2010

Eur. Phys. J. A

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We determine the helicity amplitudes A 1/2 and radiative decay widths in the transition Λ(1670) → γY (Y = Λ or Σ 0 ). The Λ( 1670) is treated as a dynamically generated resonance in mesonbaryon chiral dynamics. We obtain the radiative decay widths of the Λ(1670) to γΛ as 3 ± 2 keV and to γΣ 0 as 120 ± 50 keV. Also, the Q 2 dependence of the helicity amplitudes A 1/2 is calculated. We find that the KΞ component in the Λ(1670) structure, mainly responsible for the dynamical generation of this resonance, is also responsible for the significant suppression of the decay ratio ΓγΛ/Γ γΣ 0 . A measurement of the ratio would, thus, provide direct access to the nature of the Λ(1670). To compare the result for the Λ(1670), we calculate the helicity amplitudes A 1/2 for the two states of the Λ(1405). Also, the analytic continuation of Feynman parameterized integrals of more complicated loop amplitudes to the complex plane is developed which allows for an internally consistent evaluation of A 1/2 .

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Section: Introductionmentioning

confidence: 99%

Helicity amplitudes of the $ \Lambda$(1670) and two $ \Lambda$(1405) as dynamically generated resonances

Döring

Oset

2010

Eur. Phys. J. A

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“…There are a number of other conjectures regarding the structure of the Λ(1405). It has been suggested that it could be a dynamically generated molecular state ofKN and Σπ [18,[25][26][27][28], or a multi-quark state [29]. Recently, Roca and Oset [30] explained it as a molecular state ofKN .…”

Section: B Comparison With Hqetmentioning

confidence: 99%

Λc semileptonic decays in a quark model

Hussain

Roberts

2017

Phys. Rev. D

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Hadronic form factors for semileptonic decay of the Λc are calculated in a nonrelativistic quark model. The full quark model wave functions are employed to numerically calculate the form factors to all relevant orders in (1/mc, 1/ms). The form factors obtained satisfy relationships expected from the heavy quark effective theory (HQET). The differential decay rates and branching fractions are calculated for transitions to the ground state and a number of excited states of Λ. The

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