Hyperon semileptonic decay constants with flavor SU(3) symmetry breaking

Yang, Gi Young; Kim, Hyun-Chul

doi:10.1103/physrevc.92.035206

Cited by 44 publications

(51 citation statements)

References 79 publications

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“…Details of the semileptonic hyperon decay constants can be found in a review paper [9], and recent developments are described elsewhere [14][15][16][17][18]. However, the experimental data for the semileptonic hyperon decays show that the flavor SU (3) symmetry may be manifestly broken [14], and further precision data are needed, especially for the decays of Ξ 0 , Ξ − , and Ω − as listed in Table 4. The current measured values for the formfactor ratio g 1 (0)/f 1 (0) in the Cabibbo model [19] are also listed in [3] and data for the form-factor ratio g1(0)/f1(0) in the Cabibbo model [19] are also shown.…”

Section: Semileptonic Hyperon Decaysmentioning

confidence: 99%

“…In exact flavor SU (3) symmetry, the ratios of the axial-vector and vector constants g 1 /f 1 are expressed only by the two constants F and D. Similarly, those of the vector constants f 2 /f 1 are written in terms of the anomalous magnetic moments of the proton and the neutron with flavor SU (3) symmetry assumed [9]. Details of the semileptonic hyperon decay constants can be found in a review paper [9], and recent developments are described elsewhere [14][15][16][17][18]. However, the experimental data for the semileptonic hyperon decays show that the flavor SU (3) symmetry may be manifestly broken [14], and further precision data are needed, especially for the decays of Ξ 0 , Ξ − , and Ω − as listed in Table 4.…”

Section: Semileptonic Hyperon Decaysmentioning

confidence: 99%

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Prospects for rare and forbidden hyperon decays at BESIII

2017

Front. Phys.

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The study of hyperon decays at the Beijing Electron Spectrometer III (BESIII) is proposed to investigate the events of $J/\psi$ decay into hyperon pairs, which provide a pristine experimental environment at the Beijing Electron--Positron Collider II. About $10^{6}$--$10^8$ hyperons, i.e., $\Lambda$, $\Sigma$, $\Xi$, and $\Omega$, will be produced in the $J/\psi$ and $\psi(2S)$ decays with the proposed data samples at BESIII. Based on these samples, the measurement sensitivity of the branching fractions of the hyperon decays is in the range of $10^{-5}$--$10^{-8}$. In addition, with the known center-of-mass energy and "tag technique," rare decays and decays with invisible final states can be probed.Comment: 8 pages, 8 tables, add more references and corrections; many typos fixe

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Section: Semileptonic Hyperon Decaysmentioning

confidence: 99%

Section: Semileptonic Hyperon Decaysmentioning

confidence: 99%

Prospects for rare and forbidden hyperon decays at BESIII

2017

Front. Phys.

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“…This parametrization has no adjustable parameters once the contribution of the meson cloud in the nucleon axial- (3) scheme, and in the case of SU (6) symmetry [6,54]. F and D here are functions depending on Q 2 .…”

Section: Su (3) Baryon-meson Modelmentioning

confidence: 99%

“…The axial form factors of the octet baryons, including the nucleon, have been studied using constituent and chiral quark models [13,[25][26][27][28][29][30][31][32][33][34][35][36][37], based on the DysonSchwinger equations [38][39][40][41], models with meson cloud dressing [42][43][44][45][46][47][48][49][50][51][52][53][54], large-N C and chiral perturbation theory [5,[55][56][57][58][59][60][61][62][63][64][65] and QCD sum rules [66][67][68]. Recently, lattice QCD simulations for the nucleon became available for Q 2 = 0 [69][70][71]…”

Section: Introductionmentioning

confidence: 99%

Axial form factors of the octet baryons in a covariant quark model

Ramalho

Tsushima

2016

Phys. Rev. D

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We study the weak interaction axial form factors of the octet baryons, within the covariant spectator quark model, focusing on the dependence of four-momentum transfer squared, Q 2 . In our model the axial form factors GA(Q 2 ) (axial-vector form factor) and GP (Q 2 ) (induced pseudoscalar form factor), are calculated based on the constituent quark axial form factors and the octet baryon wave functions. The quark axial current is parametrized by the two constituent quark form factors, the axial-vector form factor g q A (Q 2 ), and the induced pseudoscalar form factor g q P (Q 2 ). The baryon wave functions are composed of a dominant S-state and a P -state mixture for the relative angular momentum of the quarks. First, we study in detail the nucleon case. We assume that the quark axial-vector form factor g q A (Q 2 ) has the same function form as that of the quark electromagnetic isovector form factor. The remaining parameters of the model, the P -state mixture and the Q 2 -dependence of g q P (Q 2 ), are determined by a fit to the nucleon axial form factor data obtained by lattice QCD simulations with large pion masses. In this lattice QCD regime the meson cloud effects are small, and the physics associated with the valence quarks can be better calibrated. Once the valence quark model is calibrated, we extend the model to the physical regime, and use the low Q 2 experimental data to estimate the meson cloud contributions for GA(Q 2 ) and GP (Q 2 ). Using the calibrated quark axial form factors, and the generalization of the nucleon wave function for the other octet baryon members, we make predictions for all the possible weak interaction axial form factors GA(Q 2 ) and GP (Q 2 ) of the octet baryons. The results are compared with the corresponding experimental data for GA(0), and with the estimates of baryon-meson models based on SU (6) symmetry.

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“…(4). The form factors for the hyperon semileptonic decays are calculated in various approaches, for examples, quark and soliton models, 1/N c expansion of QCD, lattice QCD and chiral perturbation theory etc [42,[45][46][47][48][49][50][51][52][53][54]. In this case, we choose the dipole behavior for the form factors as [40,51]…”

Section: Semileptonic Decays Of Hyperonsmentioning

confidence: 99%

Testing SU(3) flavor symmetry in semileptonic and two-body nonleptonic decays of hyperons

Wang

Yang

et al. 2019

Phys. Rev. D

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The semileptonic decays and two-body nonleptonic decays of light baryon octet (T8) and decuplet (T10) consisting of light u, d, s quarks are studied with the SU(3) flavor symmetry in this work. We obtain the amplitude relations between different decay modes by the SU(3) irreducible representation approach, and then predict relevant branching ratios by present experimental data within 1σ error.We find that the predictions for all branching ratios except B(Ξ → Λ 0 π) and B(Ξ * → Ξπ) are in good agreement with present experimental data, that implies the neglected C+ terms or SU(3) breaking effects might contribute at the order of a few percent in Ξ → Λ 0 π and Ξ * → Ξπ weak decays. We(1.35±0.28)×10 −10 , B(Ξ − → Ξ 0 e −ν e) = (4.2 ± 2.4) × 10 −10 . We also study T10 → T8P8 weak, electromagnetic or strong decays. Some of these decay modes could be observed by the BESIII, LHCb and other experiments in the near future.Due to the very small life times of Σ 0 , Ξ * 0,− , Σ * 0,− and ∆ 0,− , the branching ratios of these baryon weak decays are only at the order of O(10 −20 − 10 −13 ), which are too small to be reached by current experiments. Furthermore, the longitudinal branching ratios of T8A → T8B −ν ( = µ, e) decays are also given.

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Hyperon semileptonic decay constants with flavor SU(3) symmetry breaking

Cited by 44 publications

References 79 publications

Prospects for rare and forbidden hyperon decays at BESIII

Prospects for rare and forbidden hyperon decays at BESIII

Axial form factors of the octet baryons in a covariant quark model

Testing SU(3) flavor symmetry in semileptonic and two-body nonleptonic decays of hyperons

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