Search for exotic hadrons with the PANDA detector Jan Kisiel - - PowerPoint PPT Presentation

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Search for exotic hadrons with the PANDA detector Jan Kisiel - - PowerPoint PPT Presentation

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Search for exotic hadrons with the PANDA detector Jan Kisiel Institute of Physics, University of Silesia Katowice, Poland (kisielj@us.edu.pl) Polish-German Meeting, Warszawa, 24.11.2003 Exotic hadrons: ( gg , ggg ,...) : Glueballs

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SLIDE 1

Polish-German Meeting, Warszawa, 24.11.2003

Search for exotic hadrons with the PANDA detector

Jan Kisiel

Institute of Physics, University of Silesia Katowice, Poland

(kisielj@us.edu.pl)

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SLIDE 2

Polish-German Meeting, Warszawa, 24.11.2003

Exotic hadrons:

  • Glueballs

made entirely out of glue

: ,...) , ( ggg gg

  • Hybrids

pairs with an excited gluon

  • Molecules

pairs

q q g q q : ) ( q q q q q q : ) (

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SLIDE 3

Polish-German Meeting, Warszawa, 24.11.2003

Mesons and exotics to be studied with the PANDA detector

2 4 6 8 10 12 15 1 2 3 4 5 6

q q qq

molecules

q q c c

molecules

g u u g s s

hybrids

g c c

hybrids glueballs

... , , ω η π

light mesons charmonium LEAR Mass [GeV/ ]

2

c

[GeV/c]

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SLIDE 4

Polish-German Meeting, Warszawa, 24.11.2003

Exotic states mix with conventional states:

q q

Exotic light qq Exotic cc 1-- 1-+ 2000 4000 MeV/c

2

10

  • 2

1 10

2

look for states with quantum numbers not accesilble to conventional states.

q q

reduce mixing

difficulties in observation two possibilities

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SLIDE 5

Polish-German Meeting, Warszawa, 24.11.2003

Search for glueballs

Glueball mass spectrum (LQCD)

  • glueballs bound gluon states
  • quantum numbers:

→exotic, JPC=2+-,1-+,0--,… →„normal”, mixing with qq states

  • production cross section ~ µb
  • f0(1500) – candidate

→CB@LEAR →mixed with scalar qq states

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SLIDE 6

Polish-German Meeting, Warszawa, 24.11.2003

Crystal Barrel f0(1500) data:

  • high statistics, full solid

angle, low threshold (~20 MeV) in EM calorimeter, kaons identification

  • study of different

decay channels (branching ratios)

  • partial wave analysis

(coupled channel analysis)

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SLIDE 7

Polish-German Meeting, Warszawa, 24.11.2003

Search for charmed hybrids

: ) ( g c c

  • potential of excited gluon flux in addition to -potential for one-gluon

exchange may lead to bound states.

Π

Σ

LQCD predictions for charmed hybrids:

  • Mass: lowest state 4.2- 4.5GeV/c2
  • Quantum numbers: ground state

JPC=1-+ (exotic), but many allowed

  • Width: 5- 50MeV (narrow states)
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SLIDE 8

Polish-German Meeting, Warszawa, 24.11.2003

Schematic view of PANDA detector on High Energy Storage Ring (HESR)

p