4.8 Article

Study of the doubly charmed tetraquark Tcc+

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NATURE COMMUNICATIONS
卷 13, 期 1, 页码 -

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NATURE PORTFOLIO
DOI: 10.1038/s41467-022-30206-w

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资金

  1. CAPES (Brazil)
  2. CNPq (Brazil)
  3. FAPERJ (Brazil)
  4. FINEP (Brazil)
  5. MOST (China)
  6. NSFC (China)
  7. CNRS/IN2P3 (France)
  8. BMBF (Germany)
  9. DFG (Germany)
  10. MPG (Germany)
  11. INFN (Italy)
  12. NWO (Netherlands)
  13. MNiSW (Poland)
  14. NCN (Poland)
  15. MEN/IFA (Romania)
  16. MSHE (Russia)
  17. MICINN (Spain)
  18. SNSF (Switzerland)
  19. SER (Switzerland)
  20. NASU (Ukraine)
  21. STFC (UK)
  22. DOE NP (USA)
  23. NSF (USA)
  24. ARC (Australia)
  25. ARDC (Australia)
  26. AvH Foundation (Germany)
  27. EPLANET (European Union)
  28. Marie Sklodowska-Curie Actions (European Union)
  29. ERC (European Union)
  30. A*MIDEX (France)
  31. ANR (France)
  32. IPhU (France)
  33. Labex P2IO (France)
  34. Region Auvergne-Rhone-Alpes (France)
  35. Key Research Program of Frontier Sciences of CAS (China)
  36. CAS PIFI (China)
  37. CAS CCEPP (China)
  38. Fundamental Research Funds for the Central Universities (China)
  39. Sci. & Tech. Program of Guangzhou (China)
  40. RFBR (Russia)
  41. RSF (Russia)
  42. Yandex LLC (Russia)
  43. GVA (Spain)
  44. XuntaGal (Spain)
  45. GENCAT (Spain)
  46. Leverhulme Trust (UK)
  47. Royal Society (UK)
  48. UKRI (UK)

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This study reports the discovery of a narrow exotic state in the (DD0)-D-0 pi(+) mass spectrum, which is consistent with a tetraquark state with specific quark content and spin-parity quantum numbers. The study also reveals an unexpected dependence of the production rate on track multiplicity.
Quantum chromodynamics, the theory of the strong force, describes interactions of coloured quarks and gluons and the formation of hadronic matter. Conventional hadronic matter consists of baryons and mesons made of three quarks and quark-antiquark pairs, respectively. Particles with an alternative quark content are known as exotic states. Here a study is reported of an exotic narrow state in the (DD0)-D-0 pi(+) mass spectrum just below the D*+D-0 mass threshold produced in proton-proton collisions collected with the LHCb detector at the Large Hadron Collider. The state is consistent with the ground isoscalar T-cc(+), tetraquark with a quark content of cc (u) over bar(d) over bar and spin-parity quantum numbers J(P) =1(+). Study of the DD mass spectra disfavours interpretation of the resonance as the isovector state. The decay structure via intermediate off-shell D*(+) mesons is consistent with the observed D-0 pi(+) mass distribution. To analyse the mass of the resonance and its coupling to the DID system, a dedicated model is developed under the assumption of an isoscalar axial-vector T-cc(+), state decaying to the D*D channel. Using this model, resonance parameters including the pole position, scattering length, effective range and compositeness are determined to reveal important information about the nature of the T-cc(+), state. In addition, an unexpected dependence of the production rate on track multiplicity is observed.

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