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arXiv · 2610.38406

Amplitude analysis of the charmed baryon decay Lambda_c+ to p K_S^0 pi0

M. Ablikim·M. N. Achasov·P. Adlarson·X. C. Ai·C. S. Akondi·R. Aliberti·A. Amoroso·L. P. An·Q. An·M. S. Anderson·Y. Bai·O. Bakina·H. R. Bao·X. L. Bao·M. Barbagiovanni·V. Batozskaya·K. Begzsuren·N. Berger·M. Berlowski·M. B. Bertani·D. Bettoni·F. Bianchi·E. Bianco·A. Bortone·I. Boyko·R. A. Briere·A. Brueggemann·D. Cabiati·H. Cai·M. H. Cai·X. Cai·X. K. Cai·G. F. Cao·N. Cao·X. Cao·S. A. Cetin·X. Y. Chai·J. F. Chang·T. T. Chang·G. R. Che·Y. Z. Che·C. H. Chen·Chao Chen·E. N. Chen·G. Chen·H. S. Chen·H. Y. Chen·J. Chen·J. D. Chen·M. L. Chen·S. J. Chen·S. M. Chen·T. Chen·W. Chen·X. R. Chen·X. T. Chen·X. Y. Chen·Y. B. Chen·Y. Q. Chen·Z. K. Chen·J. Cheng·L. N. Cheng·S. K. Choi·X. Chu·G. Cibinetto·F. Cossio·J. Cottee-Meldrum·H. L. Dai·J. P. Dai·X. C. Dai·A. Dbeyssi·R. E. de Boer·D. Dedovich·Z. Y. Deng·A. Denig·I. Denisenko·M. Destefanis·F. De Mori·E. Di Fiore·X. X. Ding·Y. Ding·Y. Q. Ding·J. Dong·L. Y. Dong·M. Y. Dong·Z. J. Dong·K. B. Du·M. C. Du·S. X. Du·Shaoxu Du·X. L. Du·Y. Q. Du·C. D. Duan·Z. H. Duan·P. Egorov·G. F. Fan·K. X. Fan·Y. H. Fan·Y. L. Fan·Z. F. Fan
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Abstract

Using $e^+e^-$ annihilation data corresponding to an integrated luminosity of 4.5 fb$^{-1}$ collected with the BESIII detector at center-of-mass energies between 4.600 and 4.699 GeV, the first amplitude analysis of the charmed baryon decay $Λ_c^+ \to p K_S^0 π^0$ is performed. The processes $Λ_c^+ \to p \bar{K}^{*}(892)^0$, $Λ_c^+ \to Δ(1600)^+ K_S^0$, and $Λ_c^+ \to N(1710)^+ K_S^0$ are identified with statistical significances of $12.8σ$, $14.5σ$, and $6.2σ$, respectively. The mass and width of $Δ(1600)^+$ are measured to be $(1520.4 \pm 8.8 \pm 37.7)~\text{MeV}$ and $(199.4 \pm 26.4 \pm 39.9)~\text{MeV}$, respectively. The mass and width of $N(1710)^+$ are measured to be $(1719.7 \pm 9.4 \pm 9.1)~\text{MeV}$ and $(72.0 \pm 18.0 \pm 15.0)~\text{MeV}$, respectively. The branching fractions of these processes are determined to be $\mathcal{B}[Λ_c^+ \rightarrow Δ(1600)^+ (\rightarrow p π^0) K_S^0] = (8.10 \pm 0.80 \pm 5.57) \times 10^{-3}$, $\mathcal{B}[Λ_c^+ \rightarrow N(1710)^+ (\rightarrow p π^0) K_S^0] = (1.58 \pm 0.48 \pm 0.77) \times 10^{-3}$, and $\mathcal{B}[Λ_c^+ \rightarrow p \bar{K}^{*}(892)^0 (\rightarrow K_S^0 π^0)] = (2.63 \pm 0.47 \pm 0.29) \times 10^{-3}$, where the first uncertainties are statistical and the second systematic.

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M. Ablikim, M. N. Achasov, P. Adlarson, X. C. Ai, C. S. Akondi, R. Aliberti, A. Amoroso, L. P. An, Q. An, M. S. Anderson, Y. Bai, O. Bakina, H. R. Bao, X. L. Bao, M. Barbagiovanni, V. Batozskaya, K. Begzsuren, N. Berger, M. Berlowski, M. B. Bertani, D. Bettoni, F. Bianchi, E. Bianco, A. Bortone, I. Boyko, R. A. Briere, A. Brueggemann, D. Cabiati, H. Cai, M. H. Cai, X. Cai, X. K. Cai, G. F. Cao, N. Cao, X. Cao, S. A. Cetin, X. Y. Chai, J. F. Chang, T. T. Chang, G. R. Che, Y. Z. Che, C. H. Chen, Chao Chen, E. N. Chen, G. Chen, H. S. Chen, H. Y. Chen, J. Chen, J. D. Chen, M. L. Chen, S. J. Chen, S. M. Chen, T. Chen, W. Chen, X. R. Chen, X. T. Chen, X. Y. Chen, Y. B. Chen, Y. Q. Chen, Z. K. Chen, J. Cheng, L. N. Cheng, S. K. Choi, X. Chu, G. Cibinetto, F. Cossio, J. Cottee-Meldrum, H. L. Dai, J. P. Dai, X. C. Dai, A. Dbeyssi, R. E. de Boer, D. Dedovich, Z. Y. Deng, A. Denig, I. Denisenko, M. Destefanis, F. De Mori, E. Di Fiore, X. X. Ding, Y. Ding, Y. Q. Ding, J. Dong, L. Y. Dong, M. Y. Dong, Z. J. Dong, K. B. Du, M. C. Du, S. X. Du, Shaoxu Du, X. L. Du, Y. Q. Du, C. D. Duan, Z. H. Duan, P. Egorov, G. F. Fan, K. X. Fan, Y. H. Fan, Y. L. Fan, Z. F. Fan. 2026-10-28. Amplitude analysis of the charmed baryon decay Lambda_c+ to p K_S^0 pi0. https://arxiv.org/abs/2610.38406

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