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Physics with open charm mesons @. Andrey Sokolov IKP I FZ Jülich. PANDA Physics program. Charmonium spectroscopy: Precision M and Γ measurement, error and qq – potential. Open charm physics. Search for the charmed hybrids, glueballs.

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Physics with open charm mesons @

Physics with open charm mesons @

Andrey Sokolov

IKP I FZ Jülich


Panda physics program

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


New observations

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


Physics with open charm mesons

Andrey Sokolov


Threshold production of d sj 2317

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


Charmonium physics

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


Panda detector

PANDA Detector

Andrey Sokolov


Simulation of the d mesons

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


Reconstruction of d and d s mesons

Reconstruction of D and Ds mesons

* Only one kaon identification is required.

Andrey Sokolov


Simulation of 4040

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


Summary

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


D decay

D*-decay

Momentum vs. polar angle distribution of decay product from reaction

Andrey Sokolov


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