Authors
R Aaij, M Abdelfatah, A S W Abdelmotteleb, C Abellan Beteta, F Abudinén, T Ackernley, A A Adefisoye, B Adeva, M Adinolfi, P Adlarson, C Agapopoulou, C A Aidala, S Akar, K Akiba, P Albicocco, J Albrecht, R Aleksiejunas, F Alessio, P Alvarez Cartelle, S Amato, J L Amey, Y Amhis, L An, L Anderlini, M Andersson, P Andreola, M Andreotti, S Andres Estrada, A Anelli, D Ao, C Arata, F Archilli, Z Areg, M Argenton, S Arguedas Cuendis, L Arnone, M Artuso, E Aslanides, R Ataíde Da Silva, M Atzeni, B Audurier, J A Authier, D Bacher, I Bachiller Perea, S Bachmann, M Bachmayer, J J Back, Z B Bai, V Balagura, A Balboni, W Baldini, Z Baldwin, L Balzani, H Bao, J Baptista de Souza Leite, C Barbero Pretel, M Barbetti, I R Barbosa, R J Barlow, M Barnyakov, S Baron, S Barsuk, W Barter, J Bartz, S Bashir, B Batsukh, P B Battista, A Bavarchee, A Bay, A Beck, M Becker, F Bedeschi, I B Bediaga, N A Behling, S Belin, A Bellavista, I Belov, I Belyaev, G Bencivenni, E Ben-Haim, J L M Berkey, R Bernet, A Bertolin, F Betti, J Bex, O Bezshyyko, S Bhattacharya, M S Bieker, N V Biesuz, A Biolchini, M Birch, F C R Bishop, A Bitadze, A Bizzeti, T Blake, F Blanc, J E Blank, S Blusk, J A Boelhauve, O Boente Garcia, T Boettcher, A Bohare, C Bolognani, R Bolzonella, R B Bonacci, A Bordelius, F Borgato, S Borghi, M Borsato, J T Borsuk, E Bottalico, S A Bouchiba, M Bovill, T J V Bowcock, A Boyer, C Bozzi, J D Brandenburg, A Brea Rodriguez, N Breer, C Breitfeld, J Brodzicka, J Brown, D Brundu, E Buchanan, M Burgos Marcos, C Burr, C Buti, J S Butter, J Buytaert, W Byczynski, S Cadeddu, H Cai, Y Cai, A Caillet, R Calabrese, L Calefice, M Calvi, M Calvo Gomez, P Camargo Magalhaes, J I Cambon Bouzas, P Campana, A C Campos, A F Campoverde Quezada, Y Cao, S Capelli, M Caporale, L Capriotti, R Caravaca-Mora, A Carbone, L Carcedo Salgado, R Cardinale, A Cardini, P Carniti, L Carus, A Casais Vidal, R Caspary, G Casse, M Cattaneo, G Cavallero, V Cavallini, S Celani, I Celestino, S Cesare, A J Chadwick, I Chahrour, M Charles, Ph Charpentier, E Chatzianagnostou, R Cheaib, M Chefdeville, C Chen, J Chen, S Chen, Z Chen, A Chen Hu, M Cherif, S Chernyshenko, X Chiotopoulos, G Chizhik, V Chobanova, M Chrzaszcz, V Chulikov, P Ciambrone, X Cid Vidal, P Cifra, P E L Clarke, M Clemencic, H V Cliff, J Closier, C Cocha Toapaxi, V Coco, J Cogan, E Cogneras, L Cojocariu, S Collaviti, P Collins, T Colombo, M Colonna, A Comerma-Montells, L Congedo, J Connaughton, A Contu, N Cooke, G Cordova, C Coronel, I Corredoira, A Correia, G Corti, G C Costantino, J Cottee Meldrum, B Couturier, D C Craik, N Crepet, M Cruz Torres, M Cubero Campos, E Curras Rivera, R Currie, C L Da Silva, X Dai, J Dalseno, C D'Ambrosio, G Darze, A Davidson, J E Davies, O De Aguiar Francisco, C De Angelis, F De Benedetti, J de Boer, K De Bruyn, S De Capua, M De Cian, U De Freitas Carneiro Da Graca, E De Lucia, J M De Miranda, L De Paula, M De Serio, P De Simone, F De Vellis, J A de Vries, F Debernardis, D Decamp, S Dekkers, L Del Buono, B Delaney, J Deng, V Denysenko, O Deschamps, F Dettori, B Dey, P Di Nezza, S Ding, Y Ding, L Dittmann, A D Docheva, A Doheny, C Dong, F Dordei, A C Dos Reis, A D Dowling, L Dreyfus, W Duan, P Duda, L Dufour, V Duk, P Durante, M M Duras, J M Durham, O D Durmus, K Duwe, A Dziurda, S Easo, E Eckstein, U Egede, S Eisenhardt, E Ejopu, L Eklund, M Elashri, D Elizondo Blanco, J Ellbracht, S Ely, A Ene, J Eschle, T Evans, F Fabiano, S Faghih, L N Falcao, B Fang, R Fantechi, L Fantini, M Faria, K Farmer, F Fassin, D Fazzini, L Felkowski, C Feng, M Feng, A Fernandez Casani, M Fernandez Gomez, A D Fernez, F Ferrari, F Ferreira Rodrigues, M Ferrillo, M Ferro-Luzzi, R A Fini, M Fiorini, M Firlej, K L Fischer, D S Fitzgerald, C Fitzpatrick, T Fiutowski, F Fleuret, A Fomin, M Fontana, L A Foreman, R Forty, D Foulds-Holt, V Franco Lima, M Franco Sevilla, M Frank, E Franzoso, G Frau, C Frei, D A Friday, J Fu, Q Führing, T Fulghesu, G Galati, M D Galati, A Gallas Torreira, D Galli, S Gambetta, M Gandelman, P Gandini, B Ganie, H Gao, R Gao, T Q Gao, Y Gao, Y Gao, Y Gao, L M Garcia Martin, P Garcia Moreno, J García Pardiñas, P Gardner, L Garrido, C Gaspar, A Gavrikov, E Gersabeck, M Gersabeck, T Gershon, S Ghizzo, Z Ghorbanimoghaddam, F I Giasemis, V Gibson, H K Giemza, A L Gilman, M Giovannetti, A Gioventù, L Girardey, M A Giza, F C Glaser, V V Gligorov, C Göbel, L Golinka-Bezshyyko, E Golobardes, A Golutvin, S Gomez Fernandez, W Gomulka, F Goncalves Abrantes, I Gonçales Vaz, M Goncerz, G Gong, J A Gooding, C Gotti, E Govorkova, J P Grabowski, L A Granado Cardoso, E Graugés, E Graverini, L Grazette, G Graziani, A T Grecu, N A Grieser, L Grillo, C Gu, M Guarise, L Guerry, A-K Guseinov, Y Guz, T Gys, K Habermann, T Hadavizadeh, C Hadjivasiliou, G Haefeli, C Haen, S Haken, G Hallett, P M Hamilton, Q Han, S Han, X Han, S Hansmann-Menzemer, N Harnew, T J Harris, M Hartmann, S Hashmi, J He, N Heatley, A Hedes, F Hemmer, C Henderson, R Henderson, R D L Henderson, A M Hennequin, K Hennessy, J Herd, P Herrero Gascon, J Heuel, A Heyn, A Hicheur, G Hijano Mendizabal, J Horswill, R Hou, Y Hou, D C Houston, N Howarth, W Hu, X Hu, W Hulsbergen, R J Hunter, D Hutchcroft, M Idzik, P Ilten, A Iohner, H Jage, S J Jaimes Elles, S Jakobsen, T Jakoubek, E Jans, A Jawahery, C Jayaweera, A Jelavic, V Jevtic, Z Jia, E Jiang, X Jiang, Y Jiang, Y J Jiang, E Jimenez Moya, N Jindal, M John, A John Rubesh Rajan, D Johnson, C R Jones, S Joshi, B Jost, J Juan Castella, N Jurik, I Juszczak, K Kalecinska, D Kaminaris, S Kandybei, M Kane, Y Kang, C Kar, M Karacson, A Kauniskangas, J W Kautz, M K Kazanecki, F Keizer, M Kenzie, T Ketel, B Khanji, S Kholodenko, G Khreich, F Kiraz, T Kirn, V S Kirsebom, N Kleijne, A Kleimenova, D K Klekots, K Klimaszewski, M R Kmiec, T Knospe, R Kolb, S Koliiev, L Kolk, A Konoplyannikov, P Kopciewicz, P Koppenburg, A Korchin, I Kostiuk, O Kot, S Kotriakhova, E Kowalczyk, O Kravcov, M Kreps, W Krupa, W Krzemien, O Kshyvanskyi, S Kubis, M Kucharczyk, A Kupsc, V Kushnir, B Kutsenko, J Kvapil, I Kyryllin, D Lacarrere, P Laguarta Gonzalez, A Lai, A Lampis, D Lancierini, C Landesa Gomez, J J Lane, G Lanfranchi, C Langenbruch, T Latham, F Lazzari, C Lazzeroni, R Le Gac, H Lee, R Lefèvre, M Lehuraux, E Lemos Cid, O Leroy, T Lesiak, E D Lesser, B Leverington, A Li, C Li, C Li, H Li, J Li, K Li, L Li, P Li, P-R Li, Q Li, T Li, T Li, Y Li, Y Li, Y Li, Z Lian, Q Liang, X Liang, Z Liang, S Libralon, A Lightbody, T Lin, R Lindner, H Linton, R Litvinov, D Liu, F L Liu, G Liu, K Liu, S Liu, W Liu, Y Liu, Y Liu, Y L Liu, G Loachamin Ordonez, I Lobo, A Lobo Salvia, A Loi, T Long, F C L Lopes, J H Lopes, A Lopez Huertas, C Lopez Iribarnegaray, Q Lu, C Lucarelli, D Lucchesi, M Lucio Martinez, Y Luo, A Lupato, M Lupberger, E Luppi, K Lynch, S Lyu, X-R Lyu, H Ma, S Maccolini, F Machefert, F Maciuc, B Mack, I Mackay, L M Mackey, L R Madhan Mohan, M J Madurai, D Magdalinski, J J Malczewski, S Malde, L Malentacca, G Manca, G Mancinelli, C Mancuso, R Manera Escalero, A Mangalasseri, F M Manganella, D Manuzzi, S Mao, D Marangotto, J F Marchand, R Marchevski, U Marconi, E Mariani, S Mariani, C Marin Benito, J Marks, A M Marshall, L Martel, G Martelli, G Martellotti, L Martinazzoli, M Martinelli, C Martinez, D Martinez Gomez, D Martinez Santos, F Martinez Vidal, A Martorell I Granollers, A Massafferri, R Matev, A Mathad, C Matteuzzi, K R Mattioli, A Mauri, E Maurice, J Mauricio, P Mayencourt, J Mazorra de Cos, M Mazurek, D Mazzanti Tarancon, M McCann, N T McHugh, A McNab, R McNulty, B Meadows, D Melnychuk, D Mendoza Granada, P Menendez Valdes Perez, F M Meng, M Merk, A Merli, L Meyer Garcia, D Miao, H Miao, M Mikhasenko, D A Milanes, A Minotti, E Minucci, B Mitreska, D S Mitzel, R Mocanu, A Modak, L Moeser, R D Moise, E F Molina Cardenas, T Mombächer, M Monk, T Monnard, S Monteil, A Morcillo Gomez, G Morello, M J Morello, M P Morgenthaler, A Moro, J Moron, W Morren, A B Morris, A G Morris, R Mountain, Z Mu, N Muangkod, E Muhammad, F Muheim, M Mulder, K Müller, F Muñoz-Rojas, V Mytrochenko, P Naik, T Nakada, R Nandakumar, G Napoletano, I Nasteva, M Needham, N Neri, S Neubert, N Neufeld, J Nicolini, D Nicotra, E M Niel, L Nisi, Q Niu, B K Njoki, P Nogarolli, P Nogga, C Normand, J Novoa Fernandez, G Nowak, H N Nur, A Oblakowska-Mucha, T Oeser, O Okhrimenko, R Oldeman, F Oliva, E Olivart Pino, M Olocco, R H O'Neil, J S Ordonez Soto, D Osthues, J M Otalora Goicochea, P Owen, A Oyanguren, O Ozcelik, F Paciolla, A Padee, K O Padeken, B Pagare, T Pajero, A Palano, L Palini, M Palutan, C Pan, X Pan, S Panebianco, S Paniskaki, L Paolucci, A Papanestis, M Pappagallo, L L Pappalardo, C Pappenheimer, C Parkes, D Parmar, G Passaleva, D Passaro, A Pastore, M Patel, J Patoc, C Patrignani, A Paul, C J Pawley, A Pellegrino, J Peng, X Peng, M Pepe Altarelli, S Perazzini, H Pereira Da Costa, M Pereira Martinez, A Pereiro Castro, C Perez, P Perret, A Perrevoort, A Perro, M J Peters, K Petridis, A Petrolini, S Pezzulo, J P Pfaller, H Pham, L Pica, M Piccini, L Piccolo, B Pietrzyk, R N Pilato, D Pinci, F Pisani, M Pizzichemi, V M Placinta, M Plo Casasus, T Poeschl, F Polci, M Poli Lener, A Poluektov, I Polyakov, E Polycarpo, S Ponce, D Popov, K Popp, K Prasanth, C Prouve, D Provenzano, V Pugatch, A Puicercus Gomez, G Punzi, J R Pybus, Q Qian, W Qian, N Qin, R Quagliani, R I Rabadan Trejo, B Rachwal, R Racz, J H Rademacker, M Rama, M Ramírez García, V Ramos De Oliveira, M Ramos Pernas, M S Rangel, G Raven, M Rebollo De Miguel, F Redi, J Reich, F Reiss, Z Ren, P K Resmi, M Ribalda Galvez, R Ribatti, G Ricart, D Riccardi, S Ricciardi, K Richardson, M Richardson-Slipper, F Riehn, K Rinnert, P Robbe, G Robertson, E Rodrigues, A Rodriguez Alvarez, E Rodriguez Fernandez, J A Rodriguez Lopez, E Rodriguez Rodriguez, J Roensch, A Rogovskiy, D L Rolf, P Roloff, V Romanovskiy, A Romero Vidal, G Romolini, F Ronchetti, T Rong, M Rotondo, M S Rudolph, M Ruiz Diaz, J Ruiz Vidal, J J Saavedra-Arias, J J Saborido Silva, S E R Sacha Emile R, D Sahoo, N Sahoo, B Saitta, M Salomoni, I Sanderswood, R Santacesaria, C Santamarina Rios, M Santimaria, L Santoro, E Santovetti, A Saputi, A Sarnatskiy, G Sarpis, M Sarpis, C Satriano, A Satta, M Saur, H Sazak, F Sborzacchi, A Scarabotto, S Schael, S Scherl, M Schiller, H Schindler, M Schmelling, B Schmidt, N Schmidt, S Schmitt, H Schmitz, O Schneider, A Schopper, N Schulte, M H Schune, G Schwering, B Sciascia, A Sciuccati, G Scriven, I Segal, S Sellam, M Senghi Soares, A Sergi, N Serra, L Sestini, B Sevilla Sanjuan, Y Shang, D M Shangase, R S Sharma, L Shchutska, T Shears, J Shen, Z Shen, S Sheng, B Shi, J Shi, Q Shi, W S Shi, E Shmanin, R Silva Coutinho, G Simi, S Simone, M Singha, I Siral, N Skidmore, T Skwarnicki, M W Slater, E Smith, M Smith, L Soares Lavra, M D Sokoloff, F J P Soler, A Solomin, K Solovieva, N S Sommerfeld, R Song, Y Song, Y Song, Y S Song, F L Souza De Almeida, B Souza De Paula, K M Sowa, E Spadaro Norella, E Spedicato, J G Speer, P Spradlin, F Stagni, M Stahl, 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Vrahas, J Wagner, J Walsh, N Walter, E J Walton, G Wan, A Wang, B Wang, C Wang, G Wang, H Wang, J Wang, J Wang, J Wang, J Wang, M Wang, N W Wang, R Wang, X Wang, X Wang, X Wang, X W Wang, Y Wang, Y Wang, Y H Wang, Z Wang, Z Wang, J A Ward, M Waterlaat, N K Watson, D Websdale, Y Wei, Z Weida, J Wendel, B D C Westhenry, C White, M Whitehead, E Whiter, A R Wiederhold, D Wiedner, M A Wiegertjes, C Wild, G Wilkinson, M K Wilkinson, M Williams, M J Williams, M R J Williams, R Williams, S Williams, Z Williams, F F Wilson, M Winn, W Wislicki, M Witek, L Witola, T Wolf, E Wood, G Wormser, S A Wotton, H Wu, J Wu, X Wu, Y Wu, Z Wu, K Wyllie, S Xian, Z Xiang, Y Xie, T X Xing, A Xu, L Xu, M Xu, R Xu, Z Xu, Z Xu, Z Xu, Z Xu, S Yadav, K Yang, X Yang, Y Yang, Y Yang, Z Yang, Z Yang, H Yeung, H Yin, X Yin, C Y Yu, J Yu, X Yuan, Y Yuan, J A Zamora Saa, M Zavertyaev, M Zdybal, F Zenesini, C Zeng, M Zeng, S H Zeng, C Zhang, D Zhang, D Zhang, J Zhang, L Zhang, L Zhang, R Zhang, S Zhang, S L Zhang, Y Zhang, Z Zhang, J Zhao, Y Zhao, A Zhelezov, S Z Zheng, X Z Zheng, Y Zheng, T Zhou, X Zhou, V Zhovkovska, L Z Zhu, X Zhu, X Zhu, Y Zhu, V Zhukov, J Zhuo, D Zuliani, G Zunica, LHCb Collaboration
Published in
Physical review letters. Volume 137. Issue 2. Pages 021902. Jul 10, 2026.
Abstract
The first observation of the doubly charmed baryon Ξ_{cc}^{+} is reported through its decay to the Λ_{c}^{+}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 Ξ_{cc}^{+} mass is measured to be 3619.97±0.83±0.26_{-1.30}^{+1.90} MeV/c^{2}, where the first uncertainty is statistical, the second is systematic, and the third is due to the unknown Ξ_{cc}^{+} 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 Ξ_{cc}^{+} and Ξ_{cc}^{++} baryons is determined to be -1.77±0.84±0.15_{-1.30}^{+1.90} MeV/c^{2}. This is the first observation of a new particle made with the LHCb Run 3 detector.
PMID:
42503113
Bibliographic data and abstract were imported from PubMed on 26 Jul 2026.
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