Abstract
Based on e+e− collision samples corresponding to an integrated luminosity of 4.4 fb−1 collected with the BESIII detector at center-of-mass energies between 4.6 GeV and 4.7 GeV, a partial wave analysis of the charmed baryon hadronic decay \( {\Lambda}_c^{+} \) → Λπ+π0 is performed, and the decays \( {\Lambda}_c^{+} \) → Λρ(770)+ and \( {\Lambda}_c^{+} \) → Σ(1385)π are studied for the first time. Making use of the world-average branching fraction \( \mathcal{B}\left({\Lambda}_c^{+}\to \Lambda {\pi}^{+}{\pi}^0\right) \), their branching fractions are determined to be
where the first uncertainties are statistical, the second are systematic, and the third are from the uncertainties of the branching fractions \( \mathcal{B}\left({\Lambda}_c^{+}\to \varLambda {\pi}^{+}{\pi}^0\right) \) and \( \mathcal{B}\left(\Sigma (1385)\to \Lambda \pi \right) \). In addition, the decay asymmetry parameters are measured to be αΛρ(770)+ = − 0.763 ± 0.053 ± 0.045, \( {\alpha}_{\Sigma (1385)+{\pi}^0}=-0.917\pm 0.069\pm 0.056 \), and \( {\alpha}_{\Sigma {(1385)}^0{\pi}^{+}}=-0.789\pm 0.098\pm 0.056 \).
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The BESIII collaboration., Ablikim, M., Achasov, M.N. et al. Partial wave analysis of the charmed baryon hadronic decay \( {\Lambda}_c^{+} \) → Λπ+π0. J. High Energ. Phys. 2022, 33 (2022). https://doi.org/10.1007/JHEP12(2022)033
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DOI: https://doi.org/10.1007/JHEP12(2022)033