First observation of the decay Λc+ →n KS0 π+π0

BESIII Collaboration; N. Kalantar-Nayestanaki; M. Kavatsyuk; J. Messchendorp

doi:10.1103/PhysRevD.109.053005

First observation of the decay Λc+ →n KS0 π+π0

BESIII Collaboration, N. Kalantar-Nayestanaki, M. Kavatsyuk, J. Messchendorp

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Abstract

Based on 4.5 fb-1 of e+e- collision data accumulated at center-of-mass energies between 4599.53 and 4698.82 MeV with the BESIII detector, the decay Λc+→nKS0π+π0 is observed for the first time with a significance of 9.2σ. The branching fraction is measured to be (0.85±0.13±0.03)%, where the first uncertainty is statistical and the second is systematic, which differs from the theoretical prediction based on isospin by 4.4σ. This indicates that there may be resonant contributions or some unknown dynamics in this decay. © 2024 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.

Original language	English
Article number	053005
Number of pages	11
Journal	Physical Review D
Volume	109
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevD.109.053005
Publication status	Published - 1-Mar-2024

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@article{279635305ef54fdc8b95239ce86e390b,

title = "First observation of the decay Λc+ →n KS0 π+π0",

abstract = "Based on 4.5 fb-1 of e+e- collision data accumulated at center-of-mass energies between 4599.53 and 4698.82 MeV with the BESIII detector, the decay Λc+→nKS0π+π0 is observed for the first time with a significance of 9.2σ. The branching fraction is measured to be (0.85±0.13±0.03)%, where the first uncertainty is statistical and the second is systematic, which differs from the theoretical prediction based on isospin by 4.4σ. This indicates that there may be resonant contributions or some unknown dynamics in this decay. {\textcopyright} 2024 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the {"}https://creativecommons.org/licenses/by/4.0/{"}Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.",

author = "{BESIII Collaboration} and M. Ablikim and M.N. Achasov and P. Adlarson and Ai, {X. C.} and R. Aliberti and A. Amoroso and An, {M. R.} and Q. An and Y. Bai and O. Bakina and N. Kalantar-Nayestanaki and M. Kavatsyuk and J. Messchendorp",

year = "2024",

month = mar,

day = "1",

doi = "10.1103/PhysRevD.109.053005",

language = "English",

volume = "109",

journal = "Physical Review D",

issn = "1550-7998",

publisher = "AMER PHYSICAL SOC",

number = "5",

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TY - JOUR

T1 - First observation of the decay Λc+ →n KS0 π+π0

AU - BESIII Collaboration

AU - Ablikim, M.

AU - Achasov, M.N.

AU - Adlarson, P.

AU - Ai, X. C.

AU - Aliberti, R.

AU - Amoroso, A.

AU - An, M. R.

AU - An, Q.

AU - Bai, Y.

AU - Bakina, O.

AU - Kalantar-Nayestanaki, N.

AU - Kavatsyuk, M.

AU - Messchendorp, J.

PY - 2024/3/1

Y1 - 2024/3/1

N2 - Based on 4.5 fb-1 of e+e- collision data accumulated at center-of-mass energies between 4599.53 and 4698.82 MeV with the BESIII detector, the decay Λc+→nKS0π+π0 is observed for the first time with a significance of 9.2σ. The branching fraction is measured to be (0.85±0.13±0.03)%, where the first uncertainty is statistical and the second is systematic, which differs from the theoretical prediction based on isospin by 4.4σ. This indicates that there may be resonant contributions or some unknown dynamics in this decay. © 2024 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.

AB - Based on 4.5 fb-1 of e+e- collision data accumulated at center-of-mass energies between 4599.53 and 4698.82 MeV with the BESIII detector, the decay Λc+→nKS0π+π0 is observed for the first time with a significance of 9.2σ. The branching fraction is measured to be (0.85±0.13±0.03)%, where the first uncertainty is statistical and the second is systematic, which differs from the theoretical prediction based on isospin by 4.4σ. This indicates that there may be resonant contributions or some unknown dynamics in this decay. © 2024 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.

U2 - 10.1103/PhysRevD.109.053005

DO - 10.1103/PhysRevD.109.053005

M3 - Article

SN - 1550-7998

VL - 109

JO - Physical Review D

JF - Physical Review D

IS - 5

M1 - 053005

ER -

First observation of the decay Λc+ →n KS0 π+π0

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