Abstract
We study the hadronic decays of to the final states and , using an annihilation data sample of 567 pb-1 taken at a center-of-mass energy of 4.6 GeV with the BESIII detector at the BEPCII collider. We find evidence for the decays and with statistical significance of and , respectively. Normalizing to the reference decays and , we obtain the ratios of the branching fractions and to be and , respectively. The upper limits at the 90% confidence level are set to be and . Using BESIII measurements of the branching fractions of the reference decays, we determine % (<0.68%) and % (<1.9%). Here, the first uncertainties are statistical and the second systematic. The obtained branching fraction of is consistent with the previous measurement, and the branching fraction of is measured for the first time.
Highlights
We study the hadronic decays of Λ+c to the final states Σ+η and Σ+η′, using an e+e− annihilation data sample of 567 pb-1 taken at a center-of-mass energy of 4.6 GeV with the BESIII detector at the BEPCII collider
Nonleptonic decays of charmed baryons offer excellent opportunities for testing different theoretical approaches to describe the complicated dynamics of heavylight baryons, including the current algebra approach [1], the factorization scheme, the pole model technique [2,3,4], the relativistic quark model [5, 6] and the quark-diagram scheme [7]
In the selection of Λ+c → Σ+η, Σ+η′, Σ+π0 and Σ+ω decays, the intermediate particles Σ+, ω and η′ are reconstructed in their decays Σ+ → pπ0, ω → π+π−π0 and η′ → π+π−η, while the η and π0 mesons are reconstructed in their dominant two-photon decay mode
Summary
Nonleptonic decays of charmed baryons offer excellent opportunities for testing different theoretical approaches to describe the complicated dynamics of heavylight baryons, including the current algebra approach [1], the factorization scheme, the pole model technique [2,3,4], the relativistic quark model [5, 6] and the quark-diagram scheme [7]. Contrary to the significant progress made in the studies of heavy meson decays, the progress in both theoretical and experimental studies of heavy baryon decays is relatively sparse. Unlike the case for charmed meson decays, these nonfactorizable decays are free from color and helicity suppressions and are quite sizable. Theoretical predictions on these nonfactorizable effects are not reliable, 083002-4
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