@article{2a84d226b29c491c88e6a5367608f276,
title = "Observation of the Doubly Charmed Baryon Ξcc+ with the LHCb Run 3 Detector",
abstract = "The first observation of the doubly charmed baryon Ξcc+ is reported through its decay to the Λc+K-π+ final state, with a statistical significance exceeding seven standard deviations. The observation is made using proton-proton collision data collected in 2024 with the LHCb Run 3 detector at a center-of-mass energy of 13.6 TeV, corresponding to a total integrated luminosity of 6.9 fb-1. The Ξcc+ mass is measured to be 3619.97±0.83±0.26-1.30+1.90 MeV/c2, where the first uncertainty is statistical, the second is systematic, and the third is due to the unknown Ξcc+ lifetime, which is assumed to lie in the range 15-160 fs with a baseline value of 45 fs. The difference between the masses of the Ξcc+ and Ξcc++ baryons is determined to be -1.77±0.84±0.15-1.30+1.90 MeV/c2. This is the first observation of a new particle made with the LHCb Run 3 detector.",
author = "R. Aaij and M. Abdelfatah 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 S. Akar and K. Akiba and P. Albicocco and J. Albrecht and R. Aleksiejunas and F. Alessio and \{Alvarez Cartelle\}, P. and S. Amato and Amey, \{J. L.\} and Y. Amhis and L. An and L. Anderlini and M. Andersson and P. Andreola and M. Andreotti and \{Andres Estrada\}, S. and A. Anelli and D. Ao and C. Arata and F. Archilli and Z. Areg and M. Argenton and \{Arguedas Cuendis\}, S. and L. Arnone and M. Artuso and E. Aslanides and \{Ata{\'i}de Da Silva\}, R. and M. Atzeni and B. Audurier and Authier, \{J. A.\} and D. Bacher and \{Bachiller Perea\}, I. and S. Bachmann and M. Bachmayer and Back, \{J. J.\} and Bai, \{Z. B.\} and V. Balagura and A. Balboni and W. Baldini and Z. Baldwin and L. Balzani and H. Bao and \{Baptista De Souza Leite\}, J. and \{Barbero Pretel\}, C. and M. Barbetti and Barbosa, \{I. R.\} and Barlow, \{R. J.\} and M. Barnyakov and S. Baron and S. Barsuk and W. Barter and J. Bartz and S. Bashir and B. Batsukh and Battista, \{P. B.\} and A. Bavarchee and A. Bay and A. Beck and M. Becker and F. Bedeschi and Bediaga, \{I. B.\} and Behling, \{N. A.\} and S. Belin and A. Bellavista and I. Belov and I. Belyaev and G. Bencivenni and E. Ben-Haim and Berkey, \{J. L.M.\} and R. Bernet and A. Bertolin and F. Betti and J. Bex and O. Bezshyyko and S. Bhattacharya and Bieker, \{M. S.\} and Biesuz, \{N. V.\} and A. Biolchini and M. Birch and Bishop, \{F. C.R.\} and A. Bitadze and A. Bizzeti and T. Blake and F. Blanc and Blank, \{J. E.\} and S. Blusk and Boelhauve, \{J. A.\} and \{Boente Garcia\}, O. and T. Boettcher and A. Bohare and C. Bolognani and R. Bolzonella and Bonacci, \{R. B.\} and A. Bordelius and F. Borgato and S. Borghi and M. Borsato and Borsuk, \{J. T.\} and E. 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note = "Publisher Copyright: {\textcopyright} 2026 CERN, for the LHCb Collaboration.",
year = "2026",
month = jul,
day = "10",
doi = "10.1103/dmv6-7gdv",
language = "English",
volume = "137",
pages = "1--14",
journal = "Physical review letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "2",
}