Observation of the singly Cabibbo-suppressed decay Λc+ →pπ0

The BESIII collaboration

doi:10.1103/PhysRevD.111.L051101

Observation of the singly Cabibbo-suppressed decay Λc+ →pπ0

The BESIII collaboration

Institute of Higher Research

CAS - Institute of High Energy Physics
Budker Institute of Nuclear Physics of the Siberian Branch of the RAS
Novosibirsk State University
Uppsala University
Ruhr University Bochum
Chinese Academy of Sciences
Zhengzhou University
Johannes Gutenberg University Mainz
University of Turin
National Institute for Nuclear Physics
University of Science and Technology of China
Southeast University, Nanjing
Joint Institute for Nuclear Research
Peking University
University of Chinese Academy of Sciences
National Centre for Nuclear Research
Mongolian Academy of Sciences
Carnegie Mellon University
University of Münster
Wuhan University
Turkish Accelerator Center Particle Factory Group
Istinye University
Nankai University
Moscow Institute of Physics and Technology
China University of Geosciences, Wuhan
Soochow University
Henan University
Nanjing University
North China Electric Power University
Tsinghua University
CAS - Institute of Modern Physics
Jilin University
Hunan University
Chung-Ang University
Shandong University
Yunnan University
Helmholtz Institute Mainz
University of South China
University of Jinan
Liaoning University
Sun Yat-Sen University
University of Eastern Piedmont
Nanjing Normal University
University of Ferrara
Henan Normal University
University of Manchester
University of Oxford
GSI Helmholtz Centre for Heavy Ion Research
Guangxi University
Shandong Normal University
Fudan University
Indiana University Bloomington
University of Hawai'i at Mānoa
Suranaree University of Technology
South China Normal University
University of the Punjab
Liaoning Normal University
Hangzhou Normal University
Huangshan College
University of Groningen
Indian Institute of Technology Madras
Justus Liebig University Giessen
Qufu Normal University
Renmin University of China
Lanzhou University
Hebei University
Sichuan University
Guangxi Normal University
Shanxi University
Central China Normal University
Henan University of Science and Technology
Henan University of Technology
Central South University
Zhejiang University
Goethe University Frankfurt
COMSATS University Islamabad
IBA
University of Perugia
Universidad de Tarapacá
Russian Research Centre Kurchatov Institute
Hunan Normal University
China Center of Advanced Science and Technology World Laboratory
Shanghai Jiao Tong University
Ministry of Education of the People's Republic of China
Near East University
Beihang University
Inner Mongolia University
Yantai University
University of Bristol
Shanxi Normal University
University of Science and Technology Liaoning

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Abstract

Utilizing 4.5 fb-1 of e+e- annihilation data collected with the BESIII detector at the BEPCII collider at center-of-mass energies between 4.600 and 4.699 GeV, the first observation of the singly Cabibbo-suppressed decay Λc+→pπ0 is presented, with a statistical significance of 5.4σ. The ratio of the branching fractions of Λc+→pπ0 and Λc+→pη is measured as B(Λc+→pπ0)/B(Λc+→pη)=(0.120±0.026stat±0.007syst). This result resolves the longstanding discrepancy between earlier experimental searches, providing both a decisive conclusion and valuable input for QCD-inspired theoretical models. A sophisticated deep learning approach using a Transformer-based architecture is employed to distinguish the signal from the prevalent hadronic backgrounds, complemented by thorough validation and systematic uncertainty quantification.

Original language	English
Article number	L051101
Journal	Physical Review D
Volume	111
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevD.111.L051101
State	Published - 1 Mar 2025

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10.1103/PhysRevD.111.L051101

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title = "Observation of the singly Cabibbo-suppressed decay Λc+ →pπ0",

abstract = "Utilizing 4.5 fb-1 of e+e- annihilation data collected with the BESIII detector at the BEPCII collider at center-of-mass energies between 4.600 and 4.699 GeV, the first observation of the singly Cabibbo-suppressed decay Λc+→pπ0 is presented, with a statistical significance of 5.4σ. The ratio of the branching fractions of Λc+→pπ0 and Λc+→pη is measured as B(Λc+→pπ0)/B(Λc+→pη)=(0.120±0.026stat±0.007syst). This result resolves the longstanding discrepancy between earlier experimental searches, providing both a decisive conclusion and valuable input for QCD-inspired theoretical models. A sophisticated deep learning approach using a Transformer-based architecture is employed to distinguish the signal from the prevalent hadronic backgrounds, complemented by thorough validation and systematic uncertainty quantification.",

author = "M. Ablikim and Achasov, \{M. N.\} and P. Adlarson and O. Afedulidis and S. Kabana and \{The BESIII collaboration\}",

note = "Publisher Copyright: {\textcopyright} 2025 authors. Published by the American Physical Society.",

year = "2025",

month = mar,

day = "1",

doi = "10.1103/PhysRevD.111.L051101",

language = "English",

volume = "111",

journal = "Physical Review D",

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TY - JOUR

T1 - Observation of the singly Cabibbo-suppressed decay Λc+ →pπ0

AU - Ablikim, M.

AU - Achasov, M. N.

AU - Adlarson, P.

AU - Afedulidis, O.

AU - Kabana, S.

AU - The BESIII collaboration

PY - 2025/3/1

Y1 - 2025/3/1

N2 - Utilizing 4.5 fb-1 of e+e- annihilation data collected with the BESIII detector at the BEPCII collider at center-of-mass energies between 4.600 and 4.699 GeV, the first observation of the singly Cabibbo-suppressed decay Λc+→pπ0 is presented, with a statistical significance of 5.4σ. The ratio of the branching fractions of Λc+→pπ0 and Λc+→pη is measured as B(Λc+→pπ0)/B(Λc+→pη)=(0.120±0.026stat±0.007syst). This result resolves the longstanding discrepancy between earlier experimental searches, providing both a decisive conclusion and valuable input for QCD-inspired theoretical models. A sophisticated deep learning approach using a Transformer-based architecture is employed to distinguish the signal from the prevalent hadronic backgrounds, complemented by thorough validation and systematic uncertainty quantification.

AB - Utilizing 4.5 fb-1 of e+e- annihilation data collected with the BESIII detector at the BEPCII collider at center-of-mass energies between 4.600 and 4.699 GeV, the first observation of the singly Cabibbo-suppressed decay Λc+→pπ0 is presented, with a statistical significance of 5.4σ. The ratio of the branching fractions of Λc+→pπ0 and Λc+→pη is measured as B(Λc+→pπ0)/B(Λc+→pη)=(0.120±0.026stat±0.007syst). This result resolves the longstanding discrepancy between earlier experimental searches, providing both a decisive conclusion and valuable input for QCD-inspired theoretical models. A sophisticated deep learning approach using a Transformer-based architecture is employed to distinguish the signal from the prevalent hadronic backgrounds, complemented by thorough validation and systematic uncertainty quantification.

UR - https://www.scopus.com/pages/publications/105000965124

U2 - 10.1103/PhysRevD.111.L051101

DO - 10.1103/PhysRevD.111.L051101

M3 - Article

AN - SCOPUS:105000965124

SN - 2470-0010

VL - 111

JO - Physical Review D

JF - Physical Review D

IS - 5

M1 - L051101

ER -

Observation of the singly Cabibbo-suppressed decay Λc+ →pπ0

Abstract

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