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  • Observation of an exotic na...
    Aiola, S.; Albrecht, J.; Anderlini, L.; Andreotti, M.; Bedeschi, F.; Bernet, R.; Bernstein, H. C.; Bertolin, A.; Bieker, M. S.; Blago, M. P.; Boettcher, T.; Bondar, A.; Buonaura, A.; Buonincontri, L.; Burr, C.; Calladine, R.; Carniti, P.; Carus, L.; Charles, M.; Cogneras, E.; Cojocariu, L.; Contu, A.; Crkovská, J.; Cruz Torres, M.; Dall’Occo, E.; Dalseno, J.; Delaney, B.; Denysenko, V.; Di Nezza, P.; Dufour, L.; Durante, P.; Eidelman, S.; Fitzpatrick, C.; Franco Sevilla, M.; Fuehring, Q.; Gersabeck, M.; Göbel, C.; Grecu, A.; Greeven, L. M.; Gu, C.; Gys, T.; Hadavizadeh, T.; Hou, R.; Hunter, R. J.; Jawahery, A.; Jevtic, V.; John, M.; Kang, Y.; Karpov, M.; Kitouni, O.; Kondybayeva, A.; Kopciewicz, P.; Koppenburg, P.; Krokovny, P.; Langenbruch, C.; Langer, J.; Li, Y.; Malecki, B.; Maltsev, T.; Marin Benito, C.; McNulty, R.; Meyer Garcia, L.; Mitreska, B.; Mitzel, D. S.; Mokhnenko, S.; Nandakumar, R.; O’neil, R. H.; Padeken, K. O.; Papanestis, A.; Passalacqua, B.; Pawley, C. J.; Pietrzyk, G.; Pizzichemi, M.; Poliakova, M.; Polukhina, N.; Rachwal, B.; Rotondo, M.; Sagidova, N.; Schmelling, M.; Schmidt, B.; Schulte, S.; Shang, Y.; Smith, E.; Solovyev, I.; Stagni, F.; Sun, L.; Szumlak, T.; Trippl, C.; Tuning, N.; Valassi, A.; Vazquez Regueiro, P.; Vilasis-Cardona, X.; Vilella Figueras, E.; Bruch, D. Vom; Wang, Z.; Wiederhold, A. R.; Wilkinson, M.; Wormser, G.; Zaffaroni, E.; Zhu, Z.

    Nature physics, 07/2022, Volume: 18, Issue: 7
    Journal Article

    Abstract Conventional, hadronic matter consists of baryons and mesons made of three quarks and a quark–antiquark pair, respectively 1,2 . 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 $$\overline{{{u}}}$$ u ¯ and a $$\overline{{{d}}}$$ d ¯ quark. This exotic state has a mass of approximately 3,875 MeV and manifests as a narrow peak in the mass spectrum of D 0 D 0 π + mesons just below the D *+ D 0 mass threshold. The near-threshold mass together with the narrow width reveals the resonance nature of the state.