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.
Observation of an exotic narrow doubly charmed tetraquark / R. Aaij, A.S.W.A.. - In: NATURE PHYSICS. - ISSN 1745-2481. - 18:7(2022 Jun 16), pp. 751-754. [10.1038/s41567-022-01614-y]
Observation of an exotic narrow doubly charmed tetraquark
J. Fu;D. Marangotto;A. Merli;N. Neri;M. Petruzzo;E. Spadaro Norella;
2022
Abstract
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.| File | Dimensione | Formato | |
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