Observation of an exotic narrow doubly charmed tetraquark

Aaij,; and Abdelmotteleb, R.; and Abellán Beteta, A. S. W.; and Abudinen Gallego, C.; and Ackernley, F. J.; and Adeva, T.; and Adinolfi, B.; and Afsharnia, M.; and Agapopoulou, H.; and Aidala, C.; and Aiola, C. A.; and Ajaltouni, S.; and Akar, Z.; and Albrecht, S.; and Alessio, J.; and Alexander, F.; and Alfonso Albero, M.; and Aliouche, A.; and Alkhazov, Z.; and Alvarez Cartelle, G.; and Amato, P.; and Amey, S.; and Amhis, J. L.; and An, Y.; and Anderlini, L.; and Andreianov, L.; and Andreotti, A.; and Archilli, M.; and Artamonov, F.; and Artuso, A.; and Arzymatov, M.; and Aslanides, K.; and Atzeni, E.; and Audurier, M.; and Bachmann, B.; and Bachmayer, S.; and Back, M.; and Baladron Rodriguez, J. J.; and Balagura, P.; and Baldini, V.; and Baptista Leite, W.; and Barbetti, J.; and Barlow, M.; and Barsuk, R. J.; and Barter, S.; and Bartolini, W.; and Baryshnikov, M.; and Basels, F.; and Bashir, J. M.; and Bassi, S.; and Batsukh, G.; and Battig, B.; and Bay, A.; and Beck, A.; and Becker, A.; and Bedeschi, M.; and Bediaga, F.; and Beiter, I.; and Belavin, A.; and Belin, V.; and Bellee, S.; and Belous, V.; and Belov, K.; and Belyaev, I.; and Bencivenni, I.; and Ben-Haim, G.; and Berezhnoy, E.; and Bernet, A.; and Berninghoff, R.; and Bernstein, D.; and Bertella, H. C.; and Bertolin, C.; and Betancourt, A.; and Betti, C.; and Bezshyiko, F.; and Bhasin, I.; and Bhom, S.; and Bian, J.; and Bieker, L.; and Bifani, M. S.; and Billoir, S.; and Birch, P.; and Bishop, M.; and Bitadze, F. C. R.; and Bizzeti, A.; and Bjørn, A.; and Blago, M.; and Blake, M. P.; and Blanc, T.; and Blusk, F.; and Bobulska, S.; and Boelhauve, D.; and Boente Garcia, J. A.; and Boettcher, O.; and Boldyrev, T.; and Bondar, A.; and Bondar, A.; and Borghi, N.; and Borisyak, S.; and Borsato, M.; and Borsuk, M.; and Bouchiba, J. T.; and Bowcock, S. A.; and Boyer, T. J. V.; and Bozzi, A.; and Bradley, C.; and Braun, M. J.; and Brea Rodriguez, S.; and Brodzicka, A.; and Brossa Gonzalo, J.; and Brundu, A.; and Buonaura, D.; and Buonincontri, A.; and Burke, L.; and Burr, A. T.; and Bursche, C.; and Butkevich, A.; and Butter, A.; and Buytaert, J. S.; and Byczynski, J.; and Cadeddu, W.; and Cai, S.; and Calabrese, H.; and Calefice, R.; and Calero Diaz, L.; and Cali, L.; and Calladine, S.; and Calvi, R.; and Calvo Gomez, M.; and Camargo Magalhaes, M.; and Campana, P.; and Compoverde Quezada, P.; and Capelli, A. F.; and Capriotti, S.; and Carbone, L.; and Carboni, A.; and Cardinale, G.; and Cardini, R.; and Carli, A.; and Carniti, I.; and Carus, P.; and Carvalho Akiba, L.; and Casais Vidal, K.; and Casse, A.; and Cattaneo, G.; and Cavallero, M.; and Celani, G.; and Cerasoli, S.; and Cervenkov, J.; and Chadwick, D.; and Chapman, A. J.; and Charles, M. G.; and Charpentier, M.; and Chatzikonstantinidis, P.; and Chavez Barajas, G.; and Chefdeville, C. A.; and Chen, M.; and Chen, C.; and Chernov, S.; and Chobanova, A.; and Cholak, V.; and Chrzaszcz, S.; and Chubykin, M.; and Chulikov, A.; and Ciambrone, V.; and Cicala, P.; and Cid Vidal, M. F.; and Ciezarek, X.; and Clarke, G.; and Clemencic, P. E. L.; and Cliff, M.; and Closier, H. V.; and Cobbledick, J.; and Coco, J. L.; and Coelho, V.; and Cogan, J. A. B.; and Cogneras, J.; and Cojocariu, E.; and Collins, L.; and Colombo, P.; and Congedo, T.; and Contu, L.; and Cooke, A.; and Coombs, N.; and Corredoira, G.; and Corti, I.; and Costa Sobral, G.; and Couturier, C. M.; and Craik, B.; and Crkovská, D. C.; and Cruz Torres, J.; and Currie, M.; and Da Silva, R.; and Dadabaev, C. L.; and Dai, S.; and Dall’Occo, L.; and Dalseno, E.; and D’Ambrosio, J.; and Danilina, C.; and d’Argent, A.; and Davies, P.; and Davis, J. E.; and De Aguiar Francisco, A.; and De Bruyn, O.; and De Capua, K.; and De Cian, S.; and De Miranda, M.; and De Paula, J. 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doi:10.1038/s41567-022-01614-y

Conventional, hadronic matter consists of baryons and mesons made of three quarks and a quark–antiquark pair, respectively1,2. Here, we report the observation of a hadronic state containing four quarks in the Large Hadron Collider beauty experiment. This so-called tetraquark contains two charm quarks, a u¯ and a d¯ quark. This exotic state has a mass of approximately 3,875 MeV and manifests as a narrow peak in the mass spectrum of D0D0π+ mesons just below the D*+D0 mass threshold. The near-threshold mass together with the narrow width reveals the resonance nature of the state. © 2022, The Author(s).