Equivalent $SU(3)_f$ approaches for two-body anti-triplet charmed baryon decays

Hsiao, Y. K.; Wang, Y. L.; Zhao, H. J.

doi:10.48550/arxiv.2111.04124

Cited by 2 publications

(2 citation statements)

References 23 publications

(48 reference statements)

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“…Many of the theoretical studies for these decays rely on modeling QCD dynamics for predictions and to test different models [18][19][20][21][22][23][24]. One of the most used models is based on SU(3) flavour symmetry which parametrize amplitudes according to symmetry properties [25][26][27][28][29][30][31][32][33][34][35][36]. Although one cannot obtain the absolute size of the decay amplitudes based on the first principle calculations, relations can be obtained among different decay modes to test the model.…”

Section: Introductionmentioning

confidence: 99%

A global analysis of charmless two body hadronic decays for anti-triplet charmed baryons

Huang

Xing

2022

J. High Energ. Phys.

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Recently Belle collaboration reported new measurements for the branching fractions with the first observing two processes of $$ \mathcal{B}\left({\Xi}_c^0\to \Lambda {K}_S^0\right) $$ B Ξ c 0 → Λ K S 0 , $$ \mathcal{B}\left({\Xi}_c^0\to {\Sigma}^0{K}_S^0\right) $$ B Ξ c 0 → Σ 0 K S 0 and updating data for $$ \mathcal{B}\left({\Xi}_c^0\to {\Sigma}^{+}{K}^{-}\right) $$ B Ξ c 0 → Σ + K − . Combined with other known data on charmless two body decays of anti-triplet charmed baryons, a lot of information can be derived with the assistance of SU(3) flavour symmetry. Using SU(3) relations between different decay modes, we can give some predictions based on the new measurements which can be tested with the high luminosity experiments in the future. More interestingly, we find that a global fit is now possible with the addition of new Belle data. In general, there are 18 complex SU(3) invariant amplitudes. We find that a scenario of all amplitudes being real can fit the data well with a χ2/d.o.f. only 0.773. This indicates that neglecting the phases of the amplitudes is a reasonable assumption. When more data become available, one may be able to get more information for phases in the amplitudes. We give several comments on the feature of global fit regarding the branching fractions, relations between different decays, and decays involving K0 and $$ \overline{K} $$ K ¯ 0. Many of the unknown branching fractions and polarization asymmetry parameters of anti-triplet charmed baryon for charmless two body decays are predicted to be accessible by experiments at Belle, Belle II, BES-III, and LHCb. The validity of SU(3) for charmless two body hadronic decays can be more accurately tested.

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Section: Introductionmentioning

confidence: 99%

A global analysis of charmless two body hadronic decays for anti-triplet charmed baryons

Huang

Xing

2022

J. High Energ. Phys.

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“…For example, the phenomenological analyses of refs. [17,18] suggest that in Λ c decays, the analogues of diagrams (a), (b) and (c) are comparable in magnitude, which is very different to the situation in Λ b decays, where there is empirical evidence (noted above) for significant suppression of diagram (b) compared to (a).…”

Section: Model a Productionmentioning

confidence: 85%

Production of $P_c$ states in $Λ_b$ decays

Burns¹,

Swanson²

2022

Preprint

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We develop a model for the production of the P c states observed at LHCb in Λ b → J/ψ p K − decays. With fewer parameters than other approaches, we obtain excellent fits to the J/ψ p invariant mass spectrum, capturing both the prominent peaks, and broader features over the full range of invariant mass. A distinguishing feature of our model is that whereas P c ( 4312), P c (4380) and P c (4440) are resonances with Σ ( * ) c D( * ) constituents, the nature of P c (4457) is quite different, and can be understood either as a Σ c D * threshold cusp, a Λ c (2595) D enhancement due to the triangle singularity, or a Λ c (2595) D resonance. We propose experimental measurements that can discriminate among these possibilities. Unlike in other models, our production mechanism respects isospin symmetry and the empirical dominance of colour-enhanced processes in weak decays, and additionally gives a natural explanation for the overall shape of the data. Our model is consistent with experimental constraints from photoproduction and Λ b → Λ c D( * )0 K − decays and it does not imply the existence of partner states whose apparent absence in experiments is unexplained in other models.

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Equivalent $SU(3)_f$ approaches for two-body anti-triplet charmed baryon decays

Cited by 2 publications

References 23 publications

A global analysis of charmless two body hadronic decays for anti-triplet charmed baryons

A global analysis of charmless two body hadronic decays for anti-triplet charmed baryons

Production of $P_c$ states in $Λ_b$ decays

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