Abstract
Based on 4.5 fb−1 data taken at seven center-of-mass energies ranging from 4.600 to 4.699 GeV with the BESIII detector at the BEPCII collider, we measure the branching fractions of \( {\Lambda}_c^{+} \) → Σ+ + hadrons relative to \( {\Lambda}_c^{+} \) → Σ+π+π−. Combining with the world average branching fraction of \( {\Lambda}_c^{+} \) → Σ+π+π−, their branching fractions are measured to be (0.377 ± 0.042 ± 0.020 ± 0.021)% for \( {\Lambda}_c^{+} \) → Σ+K+K−, (0.200 ± 0.023 ± 0.011 ± 0.011)% for \( {\Lambda}_c^{+} \) → Σ+K+π−, (0.414 ± 0.080 ± 0.030 ± 0.023)% for \( {\Lambda}_c^{+} \) → Σ+ϕ and (0.197 ± 0.036 ± 0.009 ± 0.011)% for \( {\Lambda}_c^{+} \) → Σ+K+K−(non-ϕ). In all the above results, the first uncertainties are statistical, the second are systematic and the third are from external input of the branching fraction of \( {\Lambda}_c^{+} \) → Σ+π+π−. Since no signal for \( {\Lambda}_c^{+} \) → Σ+K+π−π0 is observed, the upper limit of its branching fraction is determined to be 0.13% at the 90% confidence level.
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Acknowledgments
The BESIII collaboration thanks the staff of BEPCII and the IHEP computing center for their strong support. This work is supported in part by National Key Research and Development Program of China under Contracts Nos. 2020YFA0406400, 2020YFA0406300; Joint Large-Scale Scientific Facility Funds of the National Natural Science Foundation of China (NSFC) and Chinese Academy of Sciences (CAS) under Contracts Nos. U1932101, U1732263, U1832207; NSFC under Contracts Nos. 11625523, 11635010, 11675275, 11735014, 11822506, 11835012, 11935015, 11935016, 11935018, 11961141012, 11975021, 12022510, 12035009, 12035013, 12061131003, 12175321, 12221005; State Key Laboratory of Nuclear Physics and Technology, PKU under Grant No. NPT2020KFY04; the CAS Center for Excellence in Particle Physics (CCEPP); the CAS Large-Scale Scientific Facility Program; CAS Key Research Program of Frontier Sciences under Contract No. QYZDJ-SSW-SLH040; 100 Talents Program of CAS; Fundamental Research Funds for the Central Universities; INPAC and Shanghai Key Laboratory for Particle Physics and Cosmology; ERC under Contract No. 758462; European Union Horizon 2020 research and innovation programme under Contract No. Marie Sklodowska-Curie grant agreement No 894790; German Research Foundation DFG under Contracts Nos. 443159800, Collaborative Research Center CRC 1044, FOR 2359, FOR 2359, GRK 214; Istituto Nazionale di Fisica Nucleare, Italy; Ministry of Development of Turkey under Contract No. DPT2006K-120470; National Science and Technology fund; Olle Engkvist Foundation under Contract No. 200-0605; STFC (United Kingdom); The Knut and Alice Wallenberg Foundation (Sweden) under Contract No. 2016.0157; The Royal Society, U.K. under Contracts Nos. DH140054, DH160214; The Swedish Research Council; U.S. Department of Energy under Contracts Nos. DE-FG02-05ER41374, DE-SC-0012069.
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The BESIII collaboration., Ablikim, M., Achasov, M.N. et al. Measurement of branching fractions of \( {\Lambda}_{\textrm{c}}^{+} \) decays to Σ+K+K−, Σ+ϕ and Σ+K+π−(π0). J. High Energ. Phys. 2023, 125 (2023). https://doi.org/10.1007/JHEP09(2023)125
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DOI: https://doi.org/10.1007/JHEP09(2023)125