Open Access

Observation of a New Charmed Baryon Decaying to $Ξ_{c}^{+} π^{-} π^{+}$

R. Aaij ³⁸, A. S. W. Abdelmotteleb ⁵⁷, C. Abellan Beteta ⁵¹, F. Abudinén ⁵⁷, T. Ackernley ⁶¹, A. A. Adefisoye ⁶⁹, B. Adeva ⁴⁷, M. Adinolfi ⁵⁵, P. Adlarson ⁸³ et al. (LHCb Collaboration)

P. Adlarson ⁸³, C. Agapopoulou ¹⁴, C. A. Aidala ⁸⁵, Z. Ajaltouni¹¹, S. Akar ¹¹, K. Akiba ³⁸, P. Albicocco ²⁸, J. Albrecht ^19,b, F. Alessio ⁴⁹, M. Alexander ⁶⁰, Z. Aliouche ⁶³, P. Alvarez Cartelle ⁵⁶, R. Amalric ¹⁶, S. Amato ³, J. L. Amey ⁵⁵, Y. Amhis ¹⁴, L. An ⁶, L. Anderlini ²⁷, M. Andersson ⁵¹, A. Andreianov ⁴⁴, P. Andreola ⁵¹, M. Andreotti ²⁶, D. Andreou ⁶⁹, A. Anelli ^31,49,c, D. Ao ⁷, F. Archilli ^37,d, M. Argenton ²⁶, S. Arguedas Cuendis ^9,49, A. Artamonov ⁴⁴, M. Artuso ⁶⁹, E. Aslanides ¹³, R. Ataíde Da Silva ⁵⁰, M. Atzeni ⁶⁵, B. Audurier ¹², D. Bacher ⁶⁴, I. Bachiller Perea ¹⁰, S. Bachmann ²², M. Bachmayer ⁵⁰, J. J. Back ⁵⁷, P. Baladron Rodriguez ⁴⁷, V. Balagura ¹⁵, A. Balboni ²⁶, W. Baldini ²⁶, L. Balzani ¹⁹, H. Bao ⁷, J. Baptista de Souza Leite ⁶¹, C. Barbero Pretel ^47,12, M. Barbetti ²⁷, I. R. Barbosa ⁷⁰, R. J. Barlow ⁶³, M. Barnyakov ²⁵, S. Barsuk ¹⁴, W. Barter ⁵⁹, J. Bartz ⁶⁹, J. M. Basels ¹⁷, S. Bashir ⁴⁰, B. Batsukh ⁵, P. B. Battista ¹⁴, A. Bay ⁵⁰, A. Beck ⁶⁵, M. Becker ¹⁹, F. Bedeschi ³⁵, I. B. Bediaga ², N. A. Behling ¹⁹, S. Belin ⁴⁷, K. Belous ⁴⁴, I. Belov ²⁹, I. Belyaev ³⁶, G. Benane ¹³, G. Bencivenni ²⁸, E. Ben-Haim ¹⁶, A. Berezhnoy ⁴⁴, R. Bernet ⁵¹, S. Bernet Andres ⁴⁵, A. Bertolin ³³, C. Betancourt ⁵¹, F. Betti ⁵⁹, J. Bex ⁵⁶, Ia. Bezshyiko ⁵¹, O. Bezshyyko ⁸⁴, J. Bhom ⁴¹, M. S. Bieker ¹⁹, N. V. Biesuz ²⁶, P. Billoir ¹⁶, A. Biolchini ³⁸, M. Birch ⁶², F. C. R. Bishop ¹⁰, A. Bitadze ⁶³, A. Bizzeti ²⁷, T. Blake ⁵⁷, F. Blanc ⁵⁰, J. E. Blank ¹⁹, S. Blusk ⁶⁹, V. Bocharnikov ⁴⁴, J. A. Boelhauve ¹⁹, O. Boente Garcia ¹⁵, T. Boettcher ⁶⁸, A. Bohare ⁵⁹, A. Boldyrev ⁴⁴, C. S. Bolognani ⁸⁰, R. Bolzonella ²⁶, R. B. Bonacci ¹, N. Bondar ^44,49, A. Bordelius ⁴⁹, F. Borgato ^33,49, S. Borghi ⁶³, M. Borsato ^31,c, J. T. Borsuk ⁸¹, E. Bottalico ⁶¹, S. A. Bouchiba ⁵⁰, M. Bovill ⁶⁴, T. J. V. Bowcock ⁶¹, A. Boyer ⁴⁹, C. Bozzi ²⁶, J. D. Brandenburg ⁸⁶, A. Brea Rodriguez ⁵⁰, N. Breer ¹⁹, J. Brodzicka ⁴¹, A. Brossa Gonzalo ^47,a, J. Brown ⁶¹, D. Brundu ³², E. Buchanan ⁵⁹, L. Buonincontri ^33,e, M. Burgos Marcos ⁸⁰, A. T. Burke ⁶³, C. Burr ⁴⁹, J. S. Butter ⁵⁶, J. Buytaert ⁴⁹, W. Byczynski ⁴⁹, S. Cadeddu ³², H. Cai⁷⁴, A. Caillet ¹⁶, R. Calabrese ^26,f, S. Calderon Ramirez ⁹, L. Calefice ⁴⁶, S. Cali ²⁸, M. Calvi ^31,c, M. Calvo Gomez ⁴⁵, P. Camargo Magalhaes ^2,g, J. I. Cambon Bouzas ⁴⁷, P. Campana ²⁸, D. H. Campora Perez ⁸⁰, A. F. Campoverde Quezada ⁷, S. Capelli ³¹, L. Capriotti ²⁶, R. Caravaca-Mora ⁹, A. Carbone ^25,h, L. Carcedo Salgado ⁴⁷, R. Cardinale ^29,i, A. Cardini ³², P. Carniti ^31,c, L. Carus ²², A. Casais Vidal ⁶⁵, R. Caspary ²², G. Casse ⁶¹, M. Cattaneo ⁴⁹, G. Cavallero ^26,49, V. Cavallini ^26,f, S. Celani ²², S. Cesare ^30,j, A. J. Chadwick ⁶¹, I. Chahrour ⁸⁵, H. Chang ^4,k, M. Charles ¹⁶, Ph. Charpentier ⁴⁹, E. Chatzianagnostou ³⁸, M. Chefdeville ¹⁰, C. Chen ⁵⁶, S. Chen ⁵, Z. Chen ⁷, A. Chernov ⁴¹, S. Chernyshenko ⁵³, X. Chiotopoulos ⁸⁰, V. Chobanova ⁸², M. Chrzaszcz ⁴¹, A. Chubykin ⁴⁴, V. Chulikov ^28,36, P. Ciambrone ²⁸, X. Cid Vidal ⁴⁷, G. Ciezarek ⁴⁹, P. Cifra ⁴⁹, P. E. L. Clarke ⁵⁹, M. Clemencic ⁴⁹, H. V. Cliff ⁵⁶, J. Closier ⁴⁹, C. Cocha Toapaxi ²², V. Coco ⁴⁹, J. Cogan ¹³, E. Cogneras ¹¹, L. Cojocariu ⁴³, S. Collaviti ⁵⁰, P. Collins ⁴⁹, T. Colombo ⁴⁹, M. Colonna ¹⁹, A. Comerma-Montells ⁴⁶, L. Congedo ²⁴, A. Contu ³², N. Cooke ⁶⁰, C. Coronel ⁶⁶, I. Corredoira ¹², A. Correia ¹⁶, G. Corti ⁴⁹, J. Cottee Meldrum ⁵⁵, B. Couturier ⁴⁹, D. C. Craik ⁵¹, M. Cruz Torres ², E. Curras Rivera ⁵⁰, R. Currie ⁵⁹, C. L. Da Silva ⁶⁸, S. Dadabaev ⁴⁴, L. Dai ⁷¹, X. Dai ⁴, E. Dall’Occo ⁴⁹, J. Dalseno ⁸², C. D’Ambrosio ⁴⁹, J. Daniel ¹¹, P. d’Argent ²⁴, G. Darze ³, A. Davidson ⁵⁷, J. E. Davies ⁶³, O. De Aguiar Francisco ⁶³, C. De Angelis ^32,l, F. De Benedetti ⁴⁹, J. de Boer ³⁸, K. De Bruyn ⁷⁹, S. De Capua ⁶³, M. De Cian ²², U. De Freitas Carneiro Da Graca ^2,m, E. De Lucia ²⁸, J. M. De Miranda ², L. De Paula ³, M. De Serio ^24,n, P. De Simone ²⁸, F. De Vellis ¹⁹, J. A. de Vries ⁸⁰, F. Debernardis ²⁴, D. 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Sharma ⁶⁹, I. Shchemerov ⁴⁴, L. Shchutska ⁵⁰, T. Shears ⁶¹, L. Shekhtman ⁴⁴, Z. Shen ³⁸, S. Sheng ^5,7, V. Shevchenko ⁴⁴, B. Shi ⁷, Q. Shi ⁷, Y. Shimizu ¹⁴, E. Shmanin ²⁵, R. Shorkin ⁴⁴, J. D. Shupperd ⁶⁹, R. Silva Coutinho ⁶⁹, G. Simi ^33,e, S. Simone ^24,n, M. Singha⁷⁷, N. Skidmore ⁵⁷, T. Skwarnicki ⁶⁹, M. W. Slater ⁵⁴, E. Smith ⁶⁵, K. Smith ⁶⁸, M. Smith ⁶², A. Snoch ³⁸, L. Soares Lavra ⁵⁹, M. D. Sokoloff ⁶⁶, F. J. P. Soler ⁶⁰, A. Solomin ⁵⁵, A. Solovev ⁴⁴, I. Solovyev ⁴⁴, N. S. Sommerfeld ¹⁸, R. Song ¹, Y. Song ⁵⁰, Y. Song ^4,k, Y. S. Song ⁶, F. L. Souza De Almeida ⁶⁹, B. Souza De Paula ³, E. Spadaro Norella ^29,i, E. Spedicato ²⁵, J. G. Speer ¹⁹, E. Spiridenkov⁴⁴, P. Spradlin ⁶⁰, V. Sriskaran ⁴⁹, F. Stagni ⁴⁹, M. Stahl ⁷⁶, S. Stahl ⁴⁹, S. Stanislaus ⁶⁴, M. Stefaniak ⁸⁶, E. N. Stein ⁴⁹, O. Steinkamp ⁵¹, O. Stenyakin⁴⁴, H. Stevens ¹⁹, D. Strekalina ⁴⁴, Y. Su ⁷, F. Suljik ⁶⁴, J. Sun ³², L. Sun ⁷⁴, D. Sundfeld ², W. Sutcliffe ⁵¹, K. Swientek ⁴⁰, F. Swystun ⁵⁶, A. Szabelski ⁴², T. Szumlak ⁴⁰, Y. Tan ^4,k, Y. Tang ⁷⁴, M. D. Tat ²², A. Terentev ⁴⁴, F. Terzuoli ^35,49,w, F. Teubert ⁴⁹, E. Thomas ⁴⁹, D. J. D. Thompson ⁵⁴, H. Tilquin ⁶², V. Tisserand ¹¹, S. T’Jampens ¹⁰, M. Tobin ^5,49, L. Tomassetti ^26,f, G. Tonani ^30,j, X. Tong ⁶, T. Tork ³⁰, D. Torres Machado ², L. Toscano ¹⁹, D. Y. Tou ^4,k, C. Trippl ⁴⁵, G. Tuci ²², N. Tuning ³⁸, L. H. Uecker ²², A. Ukleja ⁴⁰, D. J. Unverzagt ²², A. Upadhyay ⁷⁷, B. Urbach ⁵⁹, A. Usachov ³⁹, A. Ustyuzhanin ⁴⁴, U. Uwer ²², V. Vagnoni ²⁵, V. Valcarce Cadenas ⁴⁷, G. Valenti ²⁵, N. Valls Canudas ⁴⁹, J. van Eldik ⁴⁹, H. Van Hecke ⁶⁸, E. van Herwijnen ⁶², C. B. Van Hulse ^47,y, R. Van Laak ⁵⁰, M. van Veghel ³⁸, G. Vasquez ⁵¹, R. Vazquez Gomez ⁴⁶, P. Vazquez Regueiro ⁴⁷, C. Vázquez Sierra ⁸², S. Vecchi ²⁶, J. J. Velthuis ⁵⁵, M. Veltri ^27,z, A. Venkateswaran ⁵⁰, M. Verdoglia ³², M. Vesterinen ⁵⁷, D. Vico Benet ⁶⁴, P. Vidrier Villalba ⁴⁶, M. Vieites Diaz ⁴⁷, X. Vilasis-Cardona ⁴⁵, E. Vilella Figueras ⁶¹, A. Villa ²⁵, P. Vincent ¹⁶, B. Vivacqua ³, F. C. Volle ⁵⁴, D. vom Bruch ¹³, N. Voropaev ⁴⁴, K. Vos ⁸⁰, C. Vrahas ⁵⁹, J. Wagner ¹⁹, J. Walsh ³⁵, E. J. Walton ^1,57, G. Wan ⁶, A. Wang ⁷, C. Wang ²², G. Wang ⁸, H. Wang ⁷³, J. Wang ⁶, J. Wang ⁵, J. Wang ^4,k, J. Wang ⁷⁴, M. Wang ⁴⁹, N. W. Wang ⁷, R. Wang ⁵⁵, X. Wang ⁸, X. Wang ⁷², X. W. Wang ⁶², Y. Wang ⁶, Y. W. Wang⁷³, Z. Wang ¹⁴, Z. Wang ^4,k, Z. Wang ³⁰, J. A. Ward ^57,1, M. Waterlaat ⁴⁹, N. K. Watson ⁵⁴, D. Websdale ⁶², Y. Wei ⁶, J. Wendel ⁸², B. D. C. Westhenry ⁵⁵, C. White ⁵⁶, M. Whitehead ⁶⁰, E. Whiter ⁵⁴, A. R. Wiederhold ⁶³, D. Wiedner ¹⁹, G. Wilkinson ⁶⁴, M. K. Wilkinson ⁶⁶, M. Williams ⁶⁵, M. J. Williams ⁴⁹, M. R. J. Williams ⁵⁹, R. Williams ⁵⁶, Z. Williams ⁵⁵, F. F. Wilson ⁵⁸, M. Winn ¹², W. Wislicki ⁴², M. Witek ⁴¹, L. Witola ¹⁹, G. Wormser ¹⁴, S. A. Wotton ⁵⁶, H. Wu ⁶⁹, J. Wu ⁸, X. Wu ⁷⁴, Y. Wu ^6,56, Z. Wu ⁷, K. Wyllie ⁴⁹, S. Xian ⁷², Z. Xiang ⁵, Y. Xie ⁸, T. X. Xing ³⁰, A. Xu ³⁵, L. Xu ^4,k, L. Xu ^4,k, M. Xu ⁵⁷, Z. Xu ⁴⁹, Z. Xu ⁷, Z. Xu ⁵, K. Yang ⁶², S. Yang ⁷, X. Yang ⁶, Y. Yang ^29,i, Z. Yang ⁶, V. Yeroshenko ¹⁴, H. Yeung ⁶³, H. Yin ⁸, X. Yin ⁷, C. Y. Yu ⁶, J. Yu ⁷¹, X. Yuan ⁵, Y Yuan ^5,7, E. Zaffaroni ⁵⁰, M. Zavertyaev ²¹, M. Zdybal ⁴¹, F. Zenesini ²⁵, C. Zeng ^5,7, M. Zeng ^4,k, C. Zhang ⁶, D. Zhang ⁸, J. Zhang ⁷, L. Zhang ^4,k, S. Zhang ⁷¹, S. Zhang ⁶⁴, Y. Zhang ⁶, Y. Z. Zhang ^4,k, Z. Zhang ^4,k, Y. Zhao ²², A. Zhelezov ²², S. Z. Zheng ⁶, X. Z. Zheng ^4,k, Y. Zheng ⁷, T. Zhou ⁶, X. Zhou ⁸, Y. Zhou ⁷, V. Zhovkovska ⁵⁷, L. Z. Zhu ⁷, X. Zhu ^4,k, X. Zhu ⁸, Y. Zhu ¹⁷, V. Zhukov ¹⁷, J. Zhuo ⁴⁸, Q. Zou ^5,7, D. Zuliani ^33,e, and G. Zunica ⁵⁰ (LHCb Collaboration)

¹School of Physics and Astronomy, Monash University, Melbourne, Australia
²Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil
³Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
⁴Department of Engineering Physics, Tsinghua University, Beijing, China
⁵Institute of High Energy Physics (IHEP), Beijing, China
⁶School of Physics State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, China
⁷University of Chinese Academy of Sciences, Beijing, China
⁸Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China
⁹Consejo Nacional de Rectores (CONARE), San Jose, Costa Rica
¹⁰Université Savoie Mont Blanc, CNRS, IN2P3-LAPP, Annecy, France
¹¹Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France
¹²Université Paris-Saclay, Centre d’Etudes de Saclay (CEA), IRFU, Saclay, Gif-Sur-Yvette, France
¹³Aix Marseille Université, CNRS/IN2P3, CPPM, Marseille, France
¹⁴Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
¹⁵Laboratoire Leprince-Ringuet, CNRS/IN2P3, Ecole Polytechnique, Institut Polytechnique de Paris, Palaiseau, France
¹⁶LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France
¹⁷I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany
¹⁸Universität Bonn—Helmholtz-Institut für Strahlen und Kernphysik, Bonn, Germany
¹⁹Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany
²⁰Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany
²¹Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany
²²Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
²³School of Physics, University College Dublin, Dublin, Ireland
²⁴INFN Sezione di Bari, Bari, Italy
²⁵INFN Sezione di Bologna, Bologna, Italy
²⁶INFN Sezione di Ferrara, Ferrara, Italy
²⁷INFN Sezione di Firenze, Firenze, Italy
²⁸INFN Laboratori Nazionali di Frascati, Frascati, Italy
²⁹INFN Sezione di Genova, Genova, Italy
³⁰INFN Sezione di Milano, Milano, Italy
³¹INFN Sezione di Milano-Bicocca, Milano, Italy
³²INFN Sezione di Cagliari, Monserrato, Italy
³³INFN Sezione di Padova, Padova, Italy
³⁴INFN Sezione di Perugia, Perugia, Italy
³⁵INFN Sezione di Pisa, Pisa, Italy
³⁶INFN Sezione di Roma La Sapienza, Roma, Italy
³⁷INFN Sezione di Roma Tor Vergata, Roma, Italy
³⁸Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands
³⁹Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, Netherlands
⁴⁰AGH—University of Krakow, Faculty of Physics and Applied Computer Science, Kraków, Poland
⁴¹Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland
⁴²National Center for Nuclear Research (NCBJ), Warsaw, Poland
⁴³Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania
⁴⁴Authors affiliated with an institute formerly covered by a cooperation agreement with CERN
⁴⁵DS4DS, La Salle, Universitat Ramon Llull, Barcelona, Spain
⁴⁶ICCUB, Universitat de Barcelona, Barcelona, Spain
⁴⁷Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain
⁴⁸Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia—CSIC, Valencia, Spain
⁴⁹European Organization for Nuclear Research (CERN), Geneva, Switzerland
⁵⁰Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
⁵¹Physik-Institut, Universität Zürich, Zürich, Switzerland
⁵²NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine
⁵³Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine
⁵⁴School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom
⁵⁵H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom
⁵⁶Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom
⁵⁷Department of Physics, University of Warwick, Coventry, United Kingdom
⁵⁸STFC Rutherford Appleton Laboratory, Didcot, United Kingdom
⁵⁹School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
⁶⁰School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom
⁶¹Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom
⁶²Imperial College London, London, United Kingdom
⁶³Department of Physics and Astronomy, University of Manchester, Manchester, United Kingdom
⁶⁴Department of Physics, University of Oxford, Oxford, United Kingdom
⁶⁵Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
⁶⁶University of Cincinnati, Cincinnati, Ohio, USA
⁶⁷University of Maryland, College Park, Maryland, USA
⁶⁸Los Alamos National Laboratory (LANL), Los Alamos, New Mexico, USA
⁶⁹Syracuse University, Syracuse, New York, USA
⁷⁰Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil (associated with Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil)
⁷¹School of Physics and Electronics, Hunan University, Changsha City, China (associated with Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China)
⁷²Guangdong Provincial Key Laboratory of Nuclear Science, Guangdong-Hong Kong Joint Laboratory of Quantum Matter, Institute of Quantum Matter, South China Normal University, Guangzhou, China (associated with Department of Engineering Physics, Tsinghua University, Beijing, China)
⁷³Lanzhou University, Lanzhou, China (associated with Institute of High Energy Physics (IHEP), Beijing, China)
⁷⁴School of Physics and Technology, Wuhan University, Wuhan, China (associated with Department of Engineering Physics, Tsinghua University, Beijing, China)
⁷⁵Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia (associated with LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France)
⁷⁶Ruhr Universitaet Bochum, Fakultaet für Physik und Astronomie, Bochum, Germany (associated with Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany)
⁷⁷Eotvos Lorand University, Budapest, Hungary (associated with European Organization for Nuclear Research (CERN), Geneva, Switzerland)
⁷⁸Faculty of Physics, Vilnius University, Vilnius, Lithuania (associated with Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Freiburg, Germany)
⁷⁹Van Swinderen Institute, University of Groningen, Groningen, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands)
⁸⁰Universiteit Maastricht, Maastricht, Netherlands (associated with Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands)
⁸¹Tadeusz Kosciuszko Cracow University of Technology, Cracow, Poland (associated with Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland)
⁸²Universidade da Coruña, A Coruña, Spain (associated with DS4DS, La Salle, Universitat Ramon Llull, Barcelona, Spain)
⁸³Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden (associated with School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom)
⁸⁴Taras Schevchenko University of Kyiv, Faculty of Physics, Kyiv, Ukraine (associated with Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France)
⁸⁵University of Michigan, Ann Arbor, Michigan, USA (associated with Syracuse University, Syracuse, New York, USA)
⁸⁶Ohio State University, Columbus, Ohio, USA (associated with Los Alamos National Laboratory (LANL), Los Alamos, New Mexico, USA)

^*Full author list given at the end of the Letter.
^aDeceased.
^bAlso at Lamarr Institute for Machine Learning and Artificial Intelligence, Dortmund, Germany.
^cAlso at Università degli Studi di Milano-Bicocca, Milano, Italy.
^dAlso at Università di Roma Tor Vergata, Roma, Italy.
^eAlso at Università di Padova, Padova, Italy.
^fAlso at Università di Ferrara, Ferrara, Italy.
^gAlso at Facultad de Ciencias Fisicas, Madrid, Spain.
^hAlso at Università di Bologna, Bologna, Italy.
ⁱAlso at Università di Genova, Genova, Italy.
^jAlso at Università degli Studi di Milano, Milano, Italy.
^kAlso at Center for High Energy Physics, Tsinghua University, Beijing, China.
^lAlso at Università di Cagliari, Cagliari, Italy.
^mAlso at Centro Federal de Educacão Tecnológica Celso Suckow da Fonseca, Rio De Janeiro, Brazil.
ⁿAlso at Università di Bari, Bari, Italy.
^oAlso at Università di Perugia, Perugia, Italy.
^pAlso at LIP6, Sorbonne Université, Paris, France.
^qAlso at Università di Pisa, Pisa, Italy.
^rAlso at Hangzhou Institute for Advanced Study, UCAS, Hangzhou, China.
^sAlso at Scuola Normale Superiore, Pisa, Italy.
^tAlso at Università di Firenze, Firenze, Italy.
^uAlso at Università di Bergamo, Bergamo, Italy.
^vAlso at Universidad de Ingeniería y Tecnología (UTEC), Lima, Peru.
^wAlso at Università di Siena, Siena, Italy.
^xAlso at Università della Basilicata, Potenza, Italy.
^yAlso at Universidad de Alcalá, Alcalá de Henares, Spain.
^zAlso at Università di Urbino, Urbino, Italy.

PDF

Phys. Rev. Lett. 135, 161901 – Published 14 October, 2025

DOI: https://doi.org/10.1103/gghl-m6fm

Abstract

The $Ξ_{c}^{+} π^{-} π^{+}$ 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 $m [Ξ_{c} (2815)^{+}] = 2816.65 \pm 0.03 \pm 0.03 \pm 0.23 MeV$ , $Γ [Ξ_{c} (2815)^{+}] = 2.07 \pm 0.08 \pm 0.12 MeV$ , $m [Ξ_{c} (2923)^{+}] = 2922.8 \pm 0.3 \pm 0.5 \pm 0.2 MeV$ , $Γ [Ξ_{c} (2923)^{+}] = 5.3 \pm 0.9 \pm 1.4 MeV$ , $m [Ξ_{c} (2970)^{+}] = 2968.6 \pm 0.5 \pm 0.5 \pm 0.2 MeV$ , $Γ [Ξ_{c} (2970)^{+}] = 31.7 \pm 1.7 \pm 1.9 MeV$ , $m [Ξ_{c} (3080)^{+}] = 3076.8 \pm 0.7 \pm 1.3 \pm 0.2 MeV$ , $Γ [Ξ_{c} (3080)^{+}] = 6.8 \pm 2.3 \pm 0.9 MeV$ , where the uncertainties are statistical, systematic, and due to the limited precision on the $Ξ_{c}^{+}$ mass, respectively. The $Ξ_{c} (2923)^{+}$ baryon is observed for the first time, and is consistent with being the isospin partner of the previously observed $Ξ_{c} (2923)^{0}$ state. Most of the measured parameters are more precise than existing world averages.

Physics Subject Headings (PhySH)

Corrections

9 December, 2025

Correction: In the abstract, the letter $m$ was missing for the $Ξ_{c} (3080)$ state and has been inserted.

Article Text

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Phys. Rev. Lett. 135, 161901– Published 14 October, 2025

Vol. 135, Iss. 16 — 17 October 2025

Received 27 February 2025
Revised 24 June 2025
Accepted 20 August 2025
Corrected 9 December 2025

DOI: https://doi.org/10.1103/gghl-m6fm

Published by the American Physical Society under the terms of the 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.

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Observation of a New Charmed Baryon Decaying to $Ξ_{c}^{+} π^{-} π^{+}$

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

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Observation of a New Charmed Baryon Decaying to $Ξ_{c}^{+} π^{-} π^{+}$