Observation of an exotic narrow doubly charmed tetraquark

Aaij, R, Abdelmotteleb, ASW, Beteta, C Abellan, Gallego, FJ Abudinen, Ackernley, T, Adeva, B, Adinolfi, M, Afsharnia, H, Agapopoulou, C, Aidala, CA
et al (show 995 more authors) (2022) Observation of an exotic narrow doubly charmed tetraquark. NATURE PHYSICS, 18 (7). 751-+.

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<jats:title>Abstract</jats:title><jats:p>Conventional, hadronic matter consists of baryons and mesons made of three quarks and a quark–antiquark pair, respectively<jats:sup>1,2</jats:sup>. 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 <jats:inline-formula><jats:alternatives><jats:tex-math>$$\overline{{{{{u}}}}}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mover> <mml:mrow> <mml:mi>u</mml:mi> </mml:mrow> <mml:mo>¯</mml:mo> </mml:mover> </mml:math></jats:alternatives></jats:inline-formula> and a <jats:inline-formula><jats:alternatives><jats:tex-math>$$\overline{{{{{d}}}}}$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mover> <mml:mrow> <mml:mi>d</mml:mi> </mml:mrow> <mml:mo>¯</mml:mo> </mml:mover> </mml:math></jats:alternatives></jats:inline-formula> quark. This exotic state has a mass of approximately 3,875 MeV and manifests as a narrow peak in the mass spectrum of <jats:italic>D</jats:italic><jats:sup>0</jats:sup><jats:italic>D</jats:italic><jats:sup>0</jats:sup><jats:italic>π</jats:italic><jats:sup>+</jats:sup> mesons just below the <jats:italic>D</jats:italic><jats:sup>*+</jats:sup><jats:italic>D</jats:italic><jats:sup>0</jats:sup> mass threshold. The near-threshold mass together with the narrow width reveals the resonance nature of the state.</jats:p>

Item Type: Article
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 31 Aug 2022 10:21
Last Modified: 18 Jan 2023 20:46
DOI: 10.1038/s41567-022-01614-y
Open Access URL: https://www.nature.com/articles/s41567-022-01614-y...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3162847