Observation of the doubly-charmed-baryon decay $ {\Xi}_{cc}^{++}\to {\Xi}_c^0{\pi}^{+}{\pi}^{+} $

A search for the doubly-charmed-baryon decay ${\it Ξ}_{cc}^{++}\to{\it Ξ}_{c}^{0}(\to p K^{-}K^{-}π^{+})π^{+}π^{+}$ is performed using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of 13 $\text{TeV}$ and corresponding to an integrated luminosity of 5.4 $\text{fb}^{-1}$. A significant structure consistent with the ${\it Ξ}_{cc}^{++}$ baryon is observed in the ${\it Ξ}_{c}^{0} π^{+} π^{+}$ invariant-mass spectrum. Using the ${\it Ξ}_{cc}^{++}\to{\it Λ}_{c}^{+}(\to pK^{-}π^{+})K^{-}π^{+}π^{+}$ decay as the normalisation channel, the branching fraction ratio \begin{equation*} \frac{{\cal B}({\it Ξ}_{cc}^{++} \to {\it Ξ}_{c}^{0}π^{+}π^{+})\times{\cal B}({\it Ξ}_{c}^{0}\to pK^{-}K^{-}π^{+})} {{\cal B}({\it Ξ}_{cc}^{++}\to{\it Λ}_{c}^{+} K^{-}π^{+}π^{+})\times{\cal B}({\it Λ}_{c}^{+}\to pK^{-}π^{+})} \end{equation*} is measured to be $0.105\pm 0.014\text{\,(stat)} \pm 0.007\text{\,(syst)}$.

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Journal
arXiv (Cornell University)
Published
2025-01-01
DOI
https://doi.org/10.18154/rwth-2026-03451
Primary Topic
Particle physics theoretical and experimental studies
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article
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article

Observation of the doubly-charmed-baryon decay $ {\Xi}_{cc}^{++}\to {\Xi}_c^0{\pi}^{+}{\pi}^{+} $

S. Sheng, H.-P. Dembinski, J. Yu, O. Leroy et al.
arXiv (Cornell University)
Particle physics theoretical and experimental studies
article

Observation of the doubly-charmed-baryon decay $ {\Xi}_{cc}^{++}\to {\Xi}_c^0{\pi}^{+}{\pi}^{+} $

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article en

Abstract

A search for the doubly-charmed-baryon decay ${\it Ξ}_{cc}^{++}\to{\it Ξ}_{c}^{0}(\to p K^{-}K^{-}π^{+})π^{+}π^{+}$ is performed using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of 13 $\text{TeV}$ and corresponding to an integrated luminosity of 5.4 $\text{fb}^{-1}$. A significant structure consistent with the ${\it Ξ}_{cc}^{++}$ baryon is observed in the ${\it Ξ}_{c}^{0} π^{+} π^{+}$ invariant-mass spectrum. Using the ${\it Ξ}_{cc}^{++}\to{\it Λ}_{c}^{+}(\to pK^{-}π^{+})K^{-}π^{+}π^{+}$ decay as the normalisation channel, the branching fraction ratio \begin{equation*} \frac{{\cal B}({\it Ξ}_{cc}^{++} \to {\it Ξ}_{c}^{0}π^{+}π^{+})\times{\cal B}({\it Ξ}_{c}^{0}\to pK^{-}K^{-}π^{+})} {{\cal B}({\it Ξ}_{cc}^{++}\to{\it Λ}_{c}^{+} K^{-}π^{+}π^{+})\times{\cal B}({\it Λ}_{c}^{+}\to pK^{-}π^{+})} \end{equation*} is measured to be $0.105\pm 0.014\text{\,(stat)} \pm 0.007\text{\,(syst)}$.

arXiv (Cornell University)
Laboratoire d’Annecy de Physique des Particules (FR), Centre de physique des particules de Marseille (FR), Laboratoire de Physique Nucléaire et de Hautes Énergies (FR), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (FR), Laboratoire Leprince-Ringuet (FR), RWTH Aachen University (DE)
National Science Foundation, U.S. Department of Energy, CERN, UK Research and Innovation, Ministerul Cercetării, Inovării şi Digitalizării, Institutul National de Cercetare-Dezvoltare pentru Fizica si Inginerie Nucleara 'Horia Hulubei', Leverhulme Trust, European Commission, Deutsche Forschungsgemeinschaft, Agence Nationale de la Recherche, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, National Natural Science Foundation of China, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Bundesministerium für Bildung und Forschung, Nederlandse Organisatie voor Wetenschappelijk Onderzoek, Generalitat Valenciana, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Max-Planck-Gesellschaft, Ministerstwo Edukacji i Nauki, Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, National Academy of Sciences of Ukraine, Centre National de la Recherche Scientifique, Financiadora de Estudos e Projetos, Région Auvergne-Rhône-Alpes, CAS Center for Excellence in Particle Physics, Australian Research Data Commons, Science and Technology Facilities Council, Deutsches Elektronen-Synchrotron, Agencia Estatal de Investigación, Institute of High Energy Physics, Fundamental Research Funds for the Central Universities, Institut National de Physique Nucléaire et de Physique des Particules, Nuclear Physics
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Particle physics theoretical and experimental studies
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