Evidence for the decays of {{Lambda(+_{c}->Sigma^+eta}}) and {{Sigma(+eta^'}})
Abstract
We study the hadronic decays of Lambda_{c}(+) to the final states Sigma(+) eta and Sigma(+eta^') , 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. We find evidence for the decays Lambda_{c}(+}->Sigma({+)) eta and Sigma(+eta^') with statistical significance of 2.5sigma and 3.2sigma , respectively. Normalizing to the reference decays Lambda_c(+->Sigma^+pi^0) and Sigma(+omega) , we obtain the ratios of the branching fractions displaystylefrac{{B}(Lambda_c(+->Sigma^+eta)}{{) B}(Lambda_c(+->Sigma^+pi^0)}) and displaystylefrac{{B}(Lambda_c(+->Sigma^+eta^')}{{) B}(Lambda_c(+->Sigma^+omega)}) to be 0.35 ± 0.16 ± 0.02 and 0.86 ± 0.34 ± 0.04 , respectively. The upper limits at the 90% confidence level are set to be displaystylefrac{{B}(Lambda_c(+->Sigma^+eta)}{{) B}(Lambda_c(+->Sigma^+pi^0)}) lt 0.58 and displaystylefrac{{B}(Lambda_c(+->Sigma^+eta^')}{{) B}(Lambda_c(+->Sigma^+omega)}) lt 1.2 . Using BESIII measurements of the branching fractions of the reference decays, we determine {B}({Lambda_{c}(+}->Sigma({+}eta)) ) = (0.41±0.19±0.05) % (<0.68%) and {B}({Lambda_{c}(+}->Sigma({+}eta')) ) = (1.34±0.53±0.19) % (<1.9%). Here, the first uncertainties are statistical and the second systematic. The obtained branching fraction of Lambda_c(+->Sigma^+eta) is consistent with the previous measurement, and the branching fraction of Lambda_{c}(+}->Sigma({+}eta^{')) is measured for the first time.
- Publication:
-
Chinese Physics C
- Pub Date:
- August 2019
- DOI:
- 10.1088/1674-1137/43/8/083002
- arXiv:
- arXiv:1811.08028
- Bibcode:
- 2019ChPhC..43h3002A
- Keywords:
-
- charmed baryon;
- Λc+ decays;
- branching fractions;
- High Energy Physics - Experiment
- E-Print:
- Accepted by Chin. Phys. C : Chin. Phys. C 43, 083002, (2019)