Observation of an exotic narrow doubly charmed tetraquark

Aaij, R. (författare): Nikhef Natl Inst Subatom Phys, Amsterdam, Netherlands

Eklund, Lars (författare): Uppsala universitet,Kärnfysik,Univ Glasgow, Sch Phys & Astron, Glasgow, Lanark, Scotland

Zunica, G. (författare): Univ Manchester, Dept Phys & Astron, Manchester, Lancs, England

(creator_code:org_t)

2022-06-16
2022
Engelska.
Ingår i: Nature Physics. - : Springer Nature. - 1745-2473 .- 1745-2481. ; 18:7, s. 751-

Relaterad länk:: https://doi.org/10.1...; visa fler...; https://uu.diva-port... (primary) (Raw object); https://urn.kb.se/re...; https://doi.org/10.1...; visa färre...

Abstract Ämnesord

Stäng

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 (u) over bar and a (d) over tilde quark. This exotic state has a mass of approximately 3,875 MeV and manifests as a narrow peak in the mass spectrum of (DD0)-D-0 pi(+) 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.

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