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

Based on 4.5 fb−1e+e− collision data collected with BESIII detector at seven energy points between 4.600 and 4.699 GeV, the branching fractions for $$ {\Lambda}_c^{+}\to p\eta $$ Λ c + → pη and $$ {\Lambda}_c^{+}\to p\omega $$ Λ c + → pω were measured by means of single-tag method. The branching fractions of $$ {\Lambda}_c^{+}\to p\eta $$ Λ c + → pη and $$ {\Lambda}_c^{+}\to p\omega $$ Λ c + → pω are determined to be (1.57 ± 0.11stat± 0.04syst) × 10−3 and (1.11 ± 0.20stat± 0.07syst) × 10−3, with a statistical significance of greater than 10σ and 5.7σ, respectively. These results are consistent with the previous measurements by BESIII, LHCb and Belle, and the result of $$ {\Lambda}_c^{+}\to p\eta $$ Λ c + → pη is the most precise to date.

“…In ref. [33], the authors adopt the topological diagram approach, where the decay amplitudes consist of W -emission and W -exchange topologies. In ref.…”

Section: λ +mentioning

confidence: 99%

Measurement of the branching fractions of the singly Cabibbo-suppressed decays $$ {\Lambda}_{\textrm{c}}^{+}\to \textrm{p}\eta $$ and $$ {\Lambda}_{\textrm{c}}^{+}\to \textrm{p}\omega $$

Ablikim,

Achasov,

Adlarson

et al. 2023

Weak decays of antitriplet charmed baryons from the perspective of flavor symmetry

Wen

2023

In this work, we carry out a global fit for the two-body weak decays of antitriplet charmed baryons in both SU(3) respected and broken scenarios incorporating all the available data up to date. In the SU(3) irreducible representation approach (IRA), more amplitudes for irreducible representation terms are taken into account and the ranges for their coefficients in each scenarios are predicted. By a comparison among various fitting schemes in this work, experimental data prefer the SU(3) symmetry breaking scenario. Observables of interest, branching fractions and decay asymmetries of all the Cabibbo-favored (CF), singly Cabibbo-suppressed (SCS) and doubly Cabibbo-suppressed (DCS) channels are calculated in the chosen fitting scheme. Most of our predictions are consistent well with experimental data. We further propose more ways to explore the SU(3) symmetry in charmed baryon decays: (i) A clear measurement of branching fraction on CF mode $$ {\Xi}_c^0\to {\Xi}^0{\pi}^0 $$ Ξ c 0 → Ξ 0 π 0 as a large difference exists between SU(3) respected and broken scenarios. (ii) The decay asymmetries of the five yet-to-be measured CF decay modes, $$ {\Xi}_c^0\to {\Lambda}^0{K}_S $$ Ξ c 0 → Λ 0 K S , Σ0KS, Ξ0π0, Ξ0η, Ξ0η′, for their opposite signs in the two different cases. (iii) The future measurement on branching fraction ratios indicated from eq. (2.10) and presented on table 7. An improved measurement for $$ \alpha \left({\Lambda}_c^{+}\to p{K}_S\right) $$ α Λ c + → p K S is called for since predictions from both fittings, including the one in current work and earlier works, and the pole model calculation prefer an opposite sign from previous experimental value. Given branching fractions of most of the CF modes and part of the SCS modes being measured, predictions for the remaining channels, including the DCS modes as well as more decay asymmetries, are anticipated to be checked by the upcoming experiments in BESIII, Belle/Belle-II and LHCb.

Study of two-body doubly charmful baryonic B decays with SU(3) flavor symmetry

Hsiao

2023

Within the framework of SU(3) flavor symmetry, we investigate two-body doubly charmful baryonic $$ B\to {\textbf{B}}_c{\overline{\textbf{B}}}_c^{\prime } $$ B → B c B ¯ c ′ decays, where $$ {\textbf{B}}_c{\overline{\textbf{B}}}_c^{\prime } $$ B c B ¯ c ′ represents the anti-triplet charmed dibaryon. We determine the SU(3)f amplitudes and calculate $$ \mathcal{B}\left({B}^{-}\to {\Xi}_c^0{\overline{\Xi}}_c^{-}\right)=\left({3.4}_{-0.9}^{+1.0}\right)\times {10}^{-5} $$ B B − → Ξ c 0 Ξ ¯ c − = 3.4 − 0.9 + 1.0 × 10 − 5 and $$ \mathcal{B}\left({\overline{B}}_s^0\to {\Lambda}_c^{+}{\overline{\Xi}}_c^{-}\right)=\left({3.9}_{-1.0}^{+1.2}\right)\times {10}^{-5} $$ B B ¯ s 0 → Λ c + Ξ ¯ c − = 3.9 − 1.0 + 1.2 × 10 − 5 induced by the single W-emission configuration. We find that the W-exchange amplitude, previously neglected in studies, needs to be taken into account. It can cause a destructive interfering effect with the W-emission amplitude, alleviating the significant discrepancy between the theoretical estimation and experimental data for $$ \mathcal{B}\left({\overline{B}}^0\to {\Lambda}_c^{+}{\overline{\Lambda}}_c^{-}\right) $$ B B ¯ 0 → Λ c + Λ ¯ c − . To test other interfering decay channels, we calculate $$ \mathcal{B}\left({\overline{B}}_s^0\to {\Xi}_c^{0\left(+\right)}{\overline{\Xi}}_c^{0\left(+\right)}\right)=\left({3.0}_{-1.1}^{+1.4}\right)\times {10}^{-4} $$ B B ¯ s 0 → Ξ c 0 + Ξ ¯ c 0 + = 3.0 − 1.1 + 1.4 × 10 − 4 and $$ \mathcal{B}\left({\overline{B}}^0\to {\Xi}_c^0{\overline{\Xi}}_c^0\right)=\left({1.5}_{-0.6}^{+0.7}\right)\times {10}^{-5} $$ B B ¯ 0 → Ξ c 0 Ξ ¯ c 0 = 1.5 − 0.6 + 0.7 × 10 − 5 . We estimate non-zero branching fractions for the pure W-exchange decay channels, specifically $$ \mathcal{B}\left({\overline{B}}_s^0\to {\Lambda}_c^{+}{\overline{\Lambda}}_c^{-}\right)=\left({8.1}_{-1.5}^{+1.7}\right)\times {10}^{-5} $$ B B ¯ s 0 → Λ c + Λ ¯ c − = 8.1 − 1.5 + 1.7 × 10 − 5 and $$ \mathcal{B}\left({\overline{B}}^0\to {\Xi}_c^{+}{\overline{\Xi}}_c^{-}\right)=\left(3.0\pm 0.6\right)\times {10}^{-6} $$ B B ¯ 0 → Ξ c + Ξ ¯ c − = 3.0 ± 0.6 × 10 − 6 . Additionally, we predict $$ \mathcal{B}\left({B}_c^{+}\to {\Xi}_c^{+}{\overline{\Xi}}_c^0\right)=\left({2.8}_{-0.7}^{+0.9}\right)\times {10}^{-4} $$ B B c + → Ξ c + Ξ ¯ c 0 = 2.8 − 0.7 + 0.9 × 10 − 4 and $$ \mathcal{B}\left({B}_c^{+}\to {\Lambda}_c^{+}{\overline{\Xi}}_c^0\right)=\left({1.6}_{-0.4}^{+0.5}\right)\times {10}^{-5} $$ B B c + → Λ c + Ξ ¯ c 0 = 1.6 − 0.4 + 0.5 × 10 − 5 , which are accessible to experimental facilities such as LHCb.