Observation of a New Charmed Baryon Decaying to Ξc+ π-π+

(LHCb Collaboration)

doi:10.1103/gghl-m6fm

Observation of a New Charmed Baryon Decaying to Ξc+ π-π+

(LHCb Collaboration)

National Institute for Subatomic Physics
University of Warwick
University of Zurich
University of Liverpool
Syracuse University
University of Santiago de Compostela
University of Bristol
Department of Physics and Astronomy
Uppsala University
Université Paris-Saclay
University of Michigan, Ann Arbor
Université Clermont Auvergne
National Institute for Nuclear Physics
Fakultät Physik
TU Dortmund University
Lamarr Institute for Machine Learning and Artificial Intelligence
CERN
School of Physics and Astronomy
University of Glasgow
Department of Physics and Astronomy
University of Manchester
University of Cambridge
Sorbonne Université
Universidade Federal do Rio de Janeiro
Peking University
Authors Affiliated with An Institute Formerly Covered by A Cooperation Agreement with Cern
University of Milan - Bicocca
University of Chinese Academy of Sciences
University of Rome Tor Vergata
Consejo Nacional de Rectores (CONARE)
CPPM
Institute of Physics
Swiss Federal Institute of Technology Lausanne
Massachusetts Institute of Technology
University of Oxford
Université Savoie Mont Blanc
Heidelberg University
Laboratoire Leprince-Ringuet

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1 Cita (Scopus)

Resumen

The Ξc+π-π+ spectrum is investigated using proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb-1, collected by the LHCb experiment during 2016-2018. Four states are observed with high significance, and their masses and widths are measured to be m[Ξc(2815)+]=2816.65±0.03±0.03±0.23 MeV, Γ[Ξc(2815)+]=2.07±0.08±0.12 MeV, m[Ξc(2923)+]=2922.8±0.3±0.5±0.2 MeV, Γ[Ξc(2923)+]=5.3±0.9±1.4 MeV, m[Ξc(2970)+]=2968.6±0.5±0.5±0.2 MeV, Γ[Ξc(2970)+]=31.7±1.7±1.9 MeV, [Ξc(3080)+]=3076.8±0.7±1.3±0.2 MeV, Γ[Ξc(3080)+]=6.8±2.3±0.9 MeV, where the uncertainties are statistical, systematic, and due to the limited precision on the Ξc+ mass, respectively. The Ξc(2923)+ baryon is observed for the first time, and is consistent with being the isospin partner of the previously observed Ξc(2923)0 state. Most of the measured parameters are more precise than existing world averages.

Idioma original	Inglés
Número de artículo	161901
Publicación	Physical Review Letters
Volumen	135
N.º	16
DOI	https://doi.org/10.1103/gghl-m6fm
Estado	Publicada - 17 oct 2025
Publicado de forma externa	Sí

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10.1103/gghl-m6fm

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@article{456afbd487bd49d5a431ebe81878f2ab,

title = "Observation of a New Charmed Baryon Decaying to Ξc+ π-π+",

abstract = "The Ξc+π-π+ spectrum is investigated using proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb-1, collected by the LHCb experiment during 2016-2018. Four states are observed with high significance, and their masses and widths are measured to be m[Ξc(2815)+]=2816.65±0.03±0.03±0.23 MeV, Γ[Ξc(2815)+]=2.07±0.08±0.12 MeV, m[Ξc(2923)+]=2922.8±0.3±0.5±0.2 MeV, Γ[Ξc(2923)+]=5.3±0.9±1.4 MeV, m[Ξc(2970)+]=2968.6±0.5±0.5±0.2 MeV, Γ[Ξc(2970)+]=31.7±1.7±1.9 MeV, [Ξc(3080)+]=3076.8±0.7±1.3±0.2 MeV, Γ[Ξc(3080)+]=6.8±2.3±0.9 MeV, where the uncertainties are statistical, systematic, and due to the limited precision on the Ξc+ mass, respectively. The Ξc(2923)+ baryon is observed for the first time, and is consistent with being the isospin partner of the previously observed Ξc(2923)0 state. Most of the measured parameters are more precise than existing world averages.",

author = "\{(LHCb Collaboration)\} and R. Aaij and Abdelmotteleb, \{A. S.W.\} and \{Abellan Beteta\}, C. and F. Abudin{\'e}n and T. Ackernley and Adefisoye, \{A. A.\} and B. Adeva and M. Adinolfi and P. Adlarson and C. Agapopoulou and Aidala, \{C. A.\} and Z. Ajaltouni and S. Akar and K. Akiba and P. Albicocco and J. Albrecht and F. Alessio and M. Alexander and Z. Aliouche and \{Alvarez Cartelle\}, P. and R. Amalric and S. Amato and Amey, \{J. L.\} and Y. Amhis and L. An and L. Anderlini and M. Andersson and A. Andreianov and P. Andreola and M. Andreotti and D. Andreou and A. Anelli and D. Ao and F. Archilli and M. Argenton and \{Arguedas Cuendis\}, S. and A. Artamonov and M. Artuso and E. Aslanides and \{Ata{\'i}de Da Silva\}, R. and M. Atzeni and B. Audurier and D. Bacher and \{Bachiller Perea\}, I. and S. Bachmann and M. Bachmayer and Back, \{J. J.\} and \{Baladron Rodriguez\}, P. and V. Balagura and \{Calderon Ramirez\}, S.",

note = "Publisher Copyright: {\textcopyright} 2025 CERN.",

year = "2025",

month = oct,

day = "17",

doi = "10.1103/gghl-m6fm",

language = "Ingl{\'e}s",

volume = "135",

journal = "Physical Review Letters",

issn = "0031-9007",

number = "16",

}

TY - JOUR

T1 - Observation of a New Charmed Baryon Decaying to Ξc+ π-π+

AU - (LHCb Collaboration)

AU - Aaij, R.

AU - Abdelmotteleb, A. S.W.

AU - Abellan Beteta, C.

AU - Abudinén, F.

AU - Ackernley, T.

AU - Adefisoye, A. A.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Adlarson, P.

AU - Agapopoulou, C.

AU - Aidala, C. A.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Akiba, K.

AU - Albicocco, P.

AU - Albrecht, J.

AU - Alessio, F.

AU - Alexander, M.

AU - Aliouche, Z.

AU - Alvarez Cartelle, P.

AU - Amalric, R.

AU - Amato, S.

AU - Amey, J. L.

AU - Amhis, Y.

AU - An, L.

AU - Anderlini, L.

AU - Andersson, M.

AU - Andreianov, A.

AU - Andreola, P.

AU - Andreotti, M.

AU - Andreou, D.

AU - Anelli, A.

AU - Ao, D.

AU - Archilli, F.

AU - Argenton, M.

AU - Arguedas Cuendis, S.

AU - Artamonov, A.

AU - Artuso, M.

AU - Aslanides, E.

AU - Ataíde Da Silva, R.

AU - Atzeni, M.

AU - Audurier, B.

AU - Bacher, D.

AU - Bachiller Perea, I.

AU - Bachmann, S.

AU - Bachmayer, M.

AU - Back, J. J.

AU - Baladron Rodriguez, P.

AU - Balagura, V.

AU - Calderon Ramirez, S.

PY - 2025/10/17

Y1 - 2025/10/17

N2 - The Ξc+π-π+ spectrum is investigated using proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb-1, collected by the LHCb experiment during 2016-2018. Four states are observed with high significance, and their masses and widths are measured to be m[Ξc(2815)+]=2816.65±0.03±0.03±0.23 MeV, Γ[Ξc(2815)+]=2.07±0.08±0.12 MeV, m[Ξc(2923)+]=2922.8±0.3±0.5±0.2 MeV, Γ[Ξc(2923)+]=5.3±0.9±1.4 MeV, m[Ξc(2970)+]=2968.6±0.5±0.5±0.2 MeV, Γ[Ξc(2970)+]=31.7±1.7±1.9 MeV, [Ξc(3080)+]=3076.8±0.7±1.3±0.2 MeV, Γ[Ξc(3080)+]=6.8±2.3±0.9 MeV, where the uncertainties are statistical, systematic, and due to the limited precision on the Ξc+ mass, respectively. The Ξc(2923)+ baryon is observed for the first time, and is consistent with being the isospin partner of the previously observed Ξc(2923)0 state. Most of the measured parameters are more precise than existing world averages.

AB - The Ξc+π-π+ spectrum is investigated using proton-proton collisions at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 5.4 fb-1, collected by the LHCb experiment during 2016-2018. Four states are observed with high significance, and their masses and widths are measured to be m[Ξc(2815)+]=2816.65±0.03±0.03±0.23 MeV, Γ[Ξc(2815)+]=2.07±0.08±0.12 MeV, m[Ξc(2923)+]=2922.8±0.3±0.5±0.2 MeV, Γ[Ξc(2923)+]=5.3±0.9±1.4 MeV, m[Ξc(2970)+]=2968.6±0.5±0.5±0.2 MeV, Γ[Ξc(2970)+]=31.7±1.7±1.9 MeV, [Ξc(3080)+]=3076.8±0.7±1.3±0.2 MeV, Γ[Ξc(3080)+]=6.8±2.3±0.9 MeV, where the uncertainties are statistical, systematic, and due to the limited precision on the Ξc+ mass, respectively. The Ξc(2923)+ baryon is observed for the first time, and is consistent with being the isospin partner of the previously observed Ξc(2923)0 state. Most of the measured parameters are more precise than existing world averages.

UR - https://www.scopus.com/pages/publications/105020652535

U2 - 10.1103/gghl-m6fm

DO - 10.1103/gghl-m6fm

M3 - Artículo

C2 - 41172206

AN - SCOPUS:105020652535

SN - 0031-9007

VL - 135

JO - Physical Review Letters

JF - Physical Review Letters

IS - 16

M1 - 161901

ER -

Observation of a New Charmed Baryon Decaying to Ξc+ π-π+

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