hunting medium modifications of the chiral condensate
DESCRIPTION
e+. e-. Hunting Medium Modifications of the Chiral Condensate. B. Kämpfer. Research Center Rossendorf/Dresden Technical University Dresden. Brown & Rho (1991):. search by HADES. antennas of QCD vacuum?. with S. Zschocke, R. Thomas, Th. Hilger. - PowerPoint PPT PresentationTRANSCRIPT
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Hunting Medium Modifications of the Chiral Condensate
B. Kämpfer
Research Center Rossendorf/Dresden Technical University Dresden
with S. Zschocke, R. Thomas, Th. Hilger
antennas of QCD vacuum?
Brown & Rho (1991):search by HADES ...
e+
e-
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Universal Material Constants of Vacuum
symm. break. (spont.), o.p.
dil. symm. break.
monopoles, instantons, vortices, ...
D. Leinweber‘s
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Expansion not à la Taylor but Wilson: OPE
Observables:
Wilson coeff.quark & gluon operators
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In Medium
DiluteGasApprox.
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QCD Sum Rules à la Borel
4-quark condensates
(factorization fails)
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chiral condensate
= genuine chiral condensate
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CB-TAPS: Trnka et al. 05
strong density dependenceof combined 4-quark conds.
PRL 05
also dim-8contributions
no
rm.
mo
men
t
Thomas/Zschocke/BK
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Book Keeping of 4-Quark Condensates
vacuum: 5, medium: 12 indep. 4-q conds.
w/o colorw/ color
relations exist between 4-q conds.(not accurately fulfilled in models)
nucleon:
no inverse
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vacuum: 10, medium: 32 indep. 4-q conds.
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4-q conds. for nucleon 4-q conds. for V
3 indep. combinations of 4-q conds.
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amplifier
D in medium: Weise/Morath, Hayashigakiexpected pattern:
hadron scenarioLutz, Korpa 2005: w/o inel.
w/ inel.
2001 2000
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QCDhadron properties
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M_D, vacuum
S_0 = 2.45 GeV
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basic features (Weise,Morath 2001):w/o change of continuumPole + Continuum Ansatz
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= center of gravity of
pole ansatz is not appropriate:
1.6 2.0E [GeV]
Spe
c. F
unct
ion
[GeV
^-2]
D+ Lutz, Korpa
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How to Measure Med.-Mod. of D Mesons?
D0
K-
pi+
lesson from K-
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Fuchs et al.: T > 100 MeV meson effects
Tlab = 25 AGeV
Chem. Freeze-Out
Cleymans-Redlich-Wheaton param.
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Generalis/Broadhurst 84:
medium resistent
Weise/Morath ... 99: tiny in-medium effects
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Conclusions
1. CB-TAPS & Borel QSR:
strong in-medium change of 4q cond.
4q cond. = new order parameter?
2. N: 4q conds. vs. phenomenlogy
Quantify change of QCD vacuum:nB, T dependence of material constants
3. D: antenna of QCD vaccum
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CCC: Current-Current Correlator
+
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Problems:
mass sing. vs. mixing