Evidence of the Singly Cabibbo Suppressed decay Λ_c^+→ pπ^0
BESIII Collaboration,M. Ablikim,M. N. Achasov,P. Adlarson,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,T. T. Chang,W. L. Chang,G. R. Che,G. Chelkov,C. Chen,Chao Chen,G. Chen,H. S. Chen,M. L. Chen,S. J. Chen,S. M. Chen,T. Chen,X. R. Chen,X. T. Chen,Y. B. Chen,Y. Q. Chen,Z. J. Chen,W. S. Cheng,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,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. Y. 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. Fritzsch,C. D. 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arxiv（2023）
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摘要
Evidence for the singly Cabibbo suppressed decay Λ_c^+→ pπ^0 is
reported for the first time with a statistical significance of 3.7σ
based on 6.0 fb^-1 of e^+e^- collision data collected at
center-of-mass energies between 4.600 and 4.843 GeV with the BESIII detector at
the BEPCII collider. The absolute branching fraction of Λ_c^+→ pπ^0
is measured to be (1.56^+0.72_-0.58±0.20)× 10^-4, which
distinctly exceeds the upper limit measured by Belle experiment. Combining with
the branching fraction of Λ_c^+→ nπ^+, (6.6±1.3)×10^-4,
the ratio of the branching fractions of Λ_c^+→ nπ^+ and
Λ_c^+→ pπ^0 is calculated to be 3.2^+2.2_-1.2. As an
important input for the theoretical models describing the decay mechanisms of
charmed baryons, our result indicates that the non-factorizable contributions
play an essential role and their interference with the factorizable
contributions should not be significant. In addition, the absolute branching
fraction of Λ_c^+→ pη is measured to be (1.63±0.31_
stat±0.11_ syst) ×10^-3, which is consistent with previous
measurements.
