Measurement of the Absolute Branching Fraction of the Three-Body Decay Λ Plus C → Ξ0K+π0 and Search for Λ Plus C → Nk+ Π0, Σ0K+π0, and ΛK+ Π0

M. Ablikim,M. N. Achasov,P. Adlarson,O. Afedulidis, X. C. Ai,R. Aliberti,A. Amoroso,M. R. An,Q. An,Y. Bai,O. Bakina,I. Balossino,Y. Ban,V. Batozskaya, K. Begzsuren,N. Berger,M. Berlowski,M. Bertani,D. Bettoni,F. Bianchi,E. Bianco,A. Bortone,I. Boyko,R. A. Briere,A. Brueggemann,H. Cai,X. Cai, A. Calcaterra,G. F. Cao,N. Cao, S. A. Cetin,J. F. Chang,G. R. Che,G. Chelkov,C. Chen,Chao Chen, G. Chen,H. S. Chen,M. L. Chen, S. J. Chen,S. L. Chen, S. M. Chen,T. Chen,X. R. Chen,X. T. Chen,Y. B. Chen, Y. Q. Chen,Z. J. Chen, Z. Y. Chen,S. K. Choi,X. Chu,G. Cibinetto,S. C. Coen,F. Cossio,J. J. Cui,H. L. Dai,J. P. Dai,A. Dbeyssi,R. E. de Boer,D. Dedovich,Z. Y. Deng,A. Denig,I. Denysenko, M. Destefanis,F. De Mori,B. Ding,X. X. Ding,Y. Ding,J. Dong, L. Y. Dong,M. Y. Dong,X. Dong,M. C. Du,S. X. Du,Z. H. Duan,P. Egorov,Y. H. Fan,Y. L. Fan,J. Fang,S. S. Fang,W. X. Fang,Y. Fang,R. Farinelli, L. Fava,F. Feldbauer,G. Felici, C. Q. Feng,J. H. Feng,K. Fischer,M. Fritsch,C. D. Fu, J. L. Fu,Y. W. Fu,H. Gao,Y. N. Gao,Yang Gao,S. Garbolino,I. Garzia,L. Ge,P. T. Ge,Z. W. Ge,C. Geng,E. M. Gersabeck,A. Gilman,K. Goetzen,L. Gong,W. X. Gong,W. Gradl,S. Gramigna,M. Greco, M. H. Gu,Y. T. Gu,C. Y. Guan,Z. L. Guan,A. Q. Guo, L. B. Guo,M. J. Guo, R. P. Guo,Y. P. Guo,A. Guskov,T. T. Han,W. Y. Han,X. Q. Hao,F. A. Harris,K. K. He,K. L. He,F. H. H. Heinsius,C. H. Heinz,Y. K. Heng,C. Herold,T. Holtmann,P. C. Hong, G. Y. Hou,X. T. Hou,Y. R. Hou,Z. L. Hou,B. Y. Hu,H. M. Hu,J. F. Hu,T. Hu,Y. Hu, G. S. Huang, K. X. Huang,L. Q. Huang,X. T. Huang,Y. P. Huang,T. Hussain,F. Holzken,N. Husken,W. Imoehl,J. Jackson,S. Jaeger,S. Janchiv,J. H. Jeong,Q. Ji,Q. P. Ji, X. B. Ji,X. L. Ji,Y. Y. Ji,X. Q. Jia,Z. K. Jia,H. B. Jiang, P. C. Jiang,S. S. Jiang,T. J. Jiang,X. S. Jiang, Y. Jiang,J. B. Jiao,Z. Jiao,S. Jin,Y. Jin,M. Q. Jing,T. Johansson, S. Kabana, N. Kalantar-Nayestanaki,X. L. Kang,X. S. Kang,R. Kappert,M. Kavatsyuk,B. C. Ke,A. Khoukaz,R. Kiuchi, R. Kliemt,O. B. Kolcu, B. Kopf,M. K. Kuessner,X. Kui,N. Kumar,A. 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PHYSICAL REVIEW D(2024)

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摘要
The Cabbibo-favored decay Lambda thorn c -> Xi 0K thorn pi 0 is studied for the first time using 6.1 fb-1 of e thorn e- collision data at center-of-mass energies between 4.600 and 4.840 GeV, collected with the BESIII detector at the BEPCII collider. With a double-tag method, the branching fraction of the three-body decay Lambda thorn c -> Xi 0K thorn pi 0 is measured to be o7.79 1.46 0.95 thorn x 10-3, where the first and second uncertainties are statistical and systematic, respectively. The branching fraction of the two-body decay Lambda thorn c -> Xi o1530 thorn 0K thorn is o5.99 1.04 0.32 thorn x 10-3, which is consistent with the previous result of o5.02 0.99 0.31 thorn x 10-3. In addition, the upper limit on the branching fraction of the doubly Cabbibo-suppressed decay Lambda thorn c -> nK thorn pi 0 is 7.1 x 10-4 at the 90% confidence level. The upper limits on the branching fractions of Lambda thorn c -> sigma 0K thorn pi 0 and Lambda K thorn pi 0 are also determined to be 1.8 x 10-3 and 2.0 x 10-3, respectively
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