Polish-German Meeting, Wa rszawa, 24.11.2003 Search for exotic hadrons with the PANDA detector Jan Kisiel Institute of Physics, University of Silesia Katowice, Poland ([email protected])
Mar 18, 2016
Polish-German Meeting, Warszawa, 24.11.2003
Search for exotic hadrons with the PANDA detector
Jan KisielInstitute of Physics, University of Silesia
Katowice, Poland([email protected])
Polish-German Meeting, Warszawa, 24.11.2003
Exotic hadrons:
•Glueballs made entirely out of glue
•Hybrids pairs with an excited gluon
•Molecules pairs
:,...),( ggggg
qqgqq :)(
qqqqqq :)(
Polish-German Meeting, Warszawa, 24.11.2003
Mesons and exotics to be studied with the PANDA detector
1 2 3 4 5 6
0 2 4 6 8 10 12 15
qqqqmolecules
qqcc molecules
guugsshybrids
gcchybrids
glueballs
...,, light mesons charmonium
LEAR
[GeV/c]
Mass [GeV/ ]2c
Polish-German Meeting, Warszawa, 24.11.2003
E xot
i c lig
ht q
q
Exot
ic cc
1-- 1-+
0 2000 4000MeV/c2
10-2
1
102
Exotic states mix with conventional states:qq
difficulties in observation
two possibilities
look for states with
quantum numbers not
accesilble to conventional
states.qq
reduce mixing
Polish-German Meeting, Warszawa, 24.11.2003
Search for glueballsGlueball 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
-potential of excited gluon flux in addition to -potential for one-gluon exchange may lead to bound states.
Search for charmed hybrids :)( gcc
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
p
Schematic view of PANDA detector on High Energy Storage Ring (HESR)