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Exploring Open Charm Mesons and Charmonium Spectroscopy in PANDA Physics Program

The presentation by Andrey Sokolov at Jülich focuses on the intricacies of open charm mesons and charmonium spectroscopy. Key topics include precision measurements of mass and decay widths, the search for charmed hybrids and glueballs, and the effects of nuclear medium on meson properties. Highlighted are new observations and their implications for potential models, along with the importance of the PANDA experiment for future research. Insights into D-meson decays, reconstruction efficiencies, and the unresolved questions in this field will be emphasized, showcasing the capabilities of current detection technologies.

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Exploring Open Charm Mesons and Charmonium Spectroscopy in PANDA Physics Program

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  1. Physics with open charm mesons @ Andrey Sokolov IKP I FZ Jülich

  2. PANDA Physics program • Charmonium spectroscopy: • Precision M and Γ measurement, error and qq – potential. • Open charm physics. • Search for the charmed hybrids, glueballs. • Study of modifications of the meson. properties in the nuclear medium. • Hypernuclear physics. Andrey Sokolov

  3. The DS± spectrum |cs> + c.c. was not expected to reveal any surprises, but ... Potential model Old measurements New observations (BaBar, CLEO-c, Belle) Or these are molecules? 0- 1- 0+ 1+ 2+ 2- New observations m [GeV/c2] Ds1 D*K Ds2* DsJ (2458) D0K DsJ* (2317) Ds* Ds JP Andrey Sokolov

  4. Andrey Sokolov

  5. Threshold production of DsJ*(2317) • Depend on internal structure • the width of DsJ* can be different: • Current limit  4.9 MeV • -doubling  10 keV • Phenomenological  130 keV • DsK – molecules  200 keV Andrey Sokolov

  6. Plab [GeV/c] c2(23P2) Mcc [GeV/c2] 4.6 ψ(13D3) 10.3 c1(23P1) 4.5 ψ(13D2) h1c(21P1) c0(23P0) 4.4 ψ(11D2) 9.3 4.3 4.2 ψ(23S1) 8.0 4.1 c2(13P2) 4.0 ηc(31S0) 7.1 3.9 h1c(11P1) c1(13P1) 3.8 6.3 3.7 c0(13P0) 3.6 5.5 3.5 3.4 4.8 J/ψ(13S1) 3.3 3.2 3.1 4.1 3.0 3.4 2.9 JP=0- 1- 1+ (0,1,2)+ 2- (1,2,3)- Charmonium Physics DsJ*DsJ* Most states above DD not measured Are ψ(4040) and ψ(4160) strong mixtures of the Ψ(3S) and hybrid charmonium states or ψ(4040) is D*D*-molecule? ψ(43S1) ψ(33S1) D*D* X(3872) DD* ψ(13D1) DD ηc(21S0) Is the narrow X(3872) state D0D* molecule? Measure decay branching ratios. ηc(11S0) Andrey Sokolov

  7. PANDA Detector Andrey Sokolov

  8. Simulation of the D-mesons Vertex position Invariant mass of D - meson • 1000 decays were simulated: • Here D-mesons decayed at the point (0.1,0.1,0.4)mm. • Kaon ID was required. • Three tracks were refitted to the common vertex. Andrey Sokolov

  9. Reconstruction of D and Ds mesons * Only one kaon identification is required. Andrey Sokolov

  10. Simulation of Ψ(4040) The reaction have been studied • Simulate 5 days data • Initial S/B ratio  10-8 • Simulated S/B ratio  3 Invariant mass difference between D*± and D0 mesons Ψ(4040) invariant mass distribution Andrey Sokolov

  11. Summary • There are many open questions for open charm and charmonium above the DD threshold. • The PANDA experiment will be an excellent tool to answer these problems. • Good reconstruction efficiency for many types of D-mesons has been demonstrated. • Very high background suppression is achieved. Andrey Sokolov

  12. D*-decay Momentum vs. polar angle distribution of decay product from reaction Andrey Sokolov

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