Transcript Symmetries in Strong Interaction - Nuclear & Hadron Physics Group

QCD 2nd order Stark Effect
and Heavy Quark Systems
Su Houng Lee, Yonsei Univ.
P.Morath, S.Kim, SHL, W.Weise, PRL 82 (99) 3396
S. Kim, SHL, NPA 679 (01) 517
Y.Oh, S Kim, SHL, PRC 65 (02) 067901
SHL, C.Ko, PRC 67 (03) 038202
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QCD Vacuum is non perturbative
symmetry breaking…
Light Hadron masses are O(GeV)
whereas light quark masses are less than 10 MeV
The lowest dimensional QCD Operator characterizing the
non perturbative vacuum are,
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Light quark propagation in QCD Vacuum (QCD OPE)
+ ………….. Sensitive to vacuum quark and
gluon field configuration at small q
rho mass (770MeV), nucleon (938MeV)
Heavy quark propagation in QCD Vacuum (QCD OPE)
At heavy quark limit, sensitive to vacuum gluon field configuration
J/psi eta_c mass difference
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At high T, quark and gluon condensates changes
Karsch 03
The Heavy quark potential
Diacommo 87, SHL 88,
(Karsch et.al.)
E(T=0)
E(T)
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At finite T
1. Everything takes place only near T_c
2. Effects are difficult to observe in Heavy ion collision
On the other hand, Heavy nuclei provides a constant
density where, from low energy theorem
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Vacuum
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Heavy Nuclei
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Hydrogen Atom in external field
2nd order Stark Effect
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QCD 2nd order Stark Effect
(proportional to dipole size)
( Peskin78; formalism. Luke Manohar 92; J/psi mass shift. SHL: BS
amplitude)
Mass shift
at nuclear
matter
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-8
MeV
-50
MeV
-100
MeV
-140
MeV
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How reliable is the LO QCD result?
(If same formalism is applied to Charmonium absorption by nucleon)
Peskin, Bhanhot (78)
Kharzeev, Satz (95)
SHL,Y.Oh,S.Kim (01)
consistent with anaylsis of Fermilab p-A data at 10 GeV center of mass energy
by Hufner and Kopeliovich (00)
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Other Approaches for Charmonium
mass shift in nulcear matter:
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Quantum
numbers
QCD 2nd
Stark eff.
Potential
model
QCD sum Effects of
DD loop
rules
1--
Peskin,
Luke,
–8 MeV
Brodsky et
al.
-10 MeV
Klingle,
SHL, Ko
SHL,Weise <2 MeV
–7 MeV
0,1,2++
SHL
-40 MeV
1--
-100 MeV
< 30 MeV
1--
-140 MeV
< 30 MeV
SHL
-60 MeV
No effect
on chi_1
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Can we observe this?
Anti-Proton
Nucleus
In coming energy w
(for all charmonium )
(for all vector state)
(for all chi states )
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X
photon invariant mass s
or J/psi-photon invariant mass
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First mehtod have been used at Fermilab
E835
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Expected shifts from a nuclear target including
Fermi momentum of the nucleons
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Expected shifts in the invariant mass spectrum from a
nuclear target including collision broadening
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Such experiment can be done at
1. Fermi Lab (E835)
⇒ Changing to a nuclear Target.
2. GSI planned accelerator facility
⇒ anti proton project (1-15 GeV)
SIS100/200
HESR
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Conclusion
1. Observing Mass shift of heavy quark system in
nuclear matter (QCD 2nd order Stark effect)
⇒ give insight into QCD dynamics and
physical consequences due to change in QCD vacuum.
2. Hints, (Kaczmarek, Engels, Karsch, Laermann 99)
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