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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). Exotic hadrons:. Glueballs made entirely out of glue Hybrids pairs with an excited gluon

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Search for exotic hadrons with the PANDA detector

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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:

  • Glueballs made entirely out of glue

  • Hybrids pairs with an excited gluon

  • Molecules pairs

Polish-German Meeting, Warszawa, 24.11.2003


molecules

molecules

hybrids

hybrids

glueballs

light mesons

charmonium

Mass [GeV/ ]

Mesons and exotics to be studied with

the PANDA detector

0

2

4

6

8

10

12

15

[GeV/c]

LEAR

1

2

4

6

5

3

Polish-German Meeting, Warszawa, 24.11.2003


--

-+

1

1

2

10

c

c

q

q

c

i

t

t

o

h

x

g

i

E

l

c

i

1

t

o

x

E

-2

10

0

2000

4000

MeV/

c

2

Exotic states mix

with conventional states:

difficulties in observation

two possibilities

look for states with

quantum numbers not

accesilble to conventional

states.

reduce mixing

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

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)

Polish-German Meeting, Warszawa, 24.11.2003


Search for charmed hybrids

-potential of excited gluon flux in addition to -potential for one-gluon exchange may lead to bound states.

  • 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)

Polish-German Meeting, Warszawa, 24.11.2003


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

Polish-German Meeting, Warszawa, 24.11.2003


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