International Workshop on High Density Nuclear Physics and QCD

1
International Workshop on High Density Nuclear
Physics and QCD

• October 6-10, Yerevan, Armenia
• Sponsored by JLAB, YerPhI, and YSU

2
Physics Topics

• Short-range structure of nuclei
• High energy reactions for probing high density
  configurations in nuclei
• Onset of hard QCD dynamics in high energy nuclear
  processes
• Hadrons in the nuclear medium
• Parton propagation in nuclear medium
• Equation of state for dense nuclear matter
• Nuclear matter at high densities and neutron stars

3
Contemporary Issues in Nuclear Physics (Claudio
Ciofi degli Atti)

• NN forces
• Properties of hadrons in dense nuclear matter
• Hadron propagation in the medium
• Formation of cold dense nuclear matter

4
(No Transcript)
5
What are correlations and how to quantify them

• High momentum components (gtgt kF )
• Deuterons scaling
• Isospin dependence
• Prominent role of the tensor force

6
Kinematics optimized to minimize the competing
processes
FSI
FSI with the A-2 system
Small
Canceled in some of the measured ratios.
FSI in the SRC pair
These are not necessarily small, BUT
Conserve the isospin structure of the pair .
Conserve the CM momentum of the pair.
7
CLAS A(e,e') Result
The observed scaling means that the electrons
probe the high-momentum nucleons in the 2(3)
-nucleon phase, and the scaling factors determine
the per-nucleon probability of the 2(3) N-SRC
phase in nuclei with Agt3 relative to 3He.
K. Sh. Egiyan et al. PRC 68, 014313 (2003)
K. Sh. Egiyan et al. PRL. 96, 082501 (2006)

For 12C 2N-SRC (np, pp, nn) 20 4.5.
The probabilities for 3-nucleon SRC are smaller
by one order of magnitude relative to the 2N SRC.
There are also data from SLAC and Hall C
8
(No Transcript)
9
BNL experiment
kF
10
CM motion of the pair
Pc.mvertical , 500 MeV/c setup
MCEEP with pair CM motion sCM50 MeV/c sCM100
MeV/c sCM136 MeV/c
2 components of and 3 kinematical setups
This experiment sCM0.136 0.020 GeV/c
(p,2pn) experiment at BNL sCM0.1430.017 GeV/c
Theoretical prediction (Ciofi and Simula)
sCM0.139 GeV/c
11
p
Summary of Results
?
n
A(e,ep)
12C(p,2p n)
Tang et al. PRL 042301 (2003)
Long range (shell model) correlations
Piasetzky, Sargsian, Frankfurt, Strikman, Watson
PRL 162504(2006).
12
C
2N-SRC
60-70
n-p pairs
10-20
Single nucleons
205
74-92
4.751
p-p pairs
2N-SRC
4.751
n-n pairs
A(e,epN)
A(e,e)
R. Subedi et al., Science 320, 1476 (2008).
Egiyan et al. PRC 68, 014313.
Egiyan et al. PRL. 96, 082501 (2006)
12
The physical picture

• The photon interacts with a nucleon at rest
• The fast nucleon scatters with the second
  nucleon, also at rest
• It recoils at 90 off the fast nucleon
• About 70 off the photon direction
• This happens in the quasi-free kinematics
• NN XN1
• ?N X?1/(1(m?2-m2)/Q2)
• On-shell elementary matrix elements
• Unitarity!!
• Low momentum of the deuteron w.f.
• Even though large recoil momentum

Well under control ? A TOOL
13
Momentum Dependence at higher Q2
14
(No Transcript)
15
Makeup of a Neutron Star
Armen Sedrakian, Prog.Part.Nucl.Phys.58168-246,20
07. nucl-th/0601086
16
Equation of State and Maximum Neutron Star Mass
New degrees of freedom, hyperons and quark
matter, relief pressure and soften the equation
of state.
(Figs. from F. Weber, et al., arXivastro-ph/06060
93.)
17
Introduction
RMF-theory
.
18
EOS of neutron star matter in nucleonic phase
19
EOS with quark deconfined phase transition
20
Neutron stars with quark core
21
Catastrophic conversion due to deconfined phase
transition
22
Modelling the Deuteron Structure at Short
Distances
Egle Tomasi-GustafssonSaclay, France
Yerevan, October 8, 2008
23
Hadron Electromagnetic Form factors

• Characterize the internal structure of a particle
  (? point-like)
• In a P- and T-invariant theory, the EM structure
  of a particle of spin S is defined by 2S1 form
  factors.
• Neutron and proton form factors are different
• Deuteron (S1,T0) 3 FFs Gc, Gq,Gm
• Playground for theory and experiment
• at low Q2 probes size of the nucleus,
• at high Q2 test QCD scaling
• New interest due to polarization data

24
Apply to ee- ? dd
Deuteron FFs All kinematical region
GQ
PRC 74, 025202 (2006) (Imaginary part from the
intrinsic term No finite width for r,w mesons)
UA (Dubnicka)
GM
Parametrization I (real part) Abbott, EPJA 2000
Space-like region Q2gt0
GC
Physical Threshold 4M2
Time-like
OR with gddee- (at JLAB)
25

• Other topics
• Hadron propagation
• Medium modifications