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Interpretation of recent JLab results on Interpretation of recent JLab results on quasi elastic (e,e’p) reactions off few-nquasi elastic (e,e’p) reactions off few-nucleon systems ucleon systems
Interpretation of recent JLab results on Interpretation of recent JLab results on quasi elastic (e,e’p) reactions off few-nquasi elastic (e,e’p) reactions off few-nucleon systems ucleon systems
INPC2007, Tokyo, 6 June, 2007
H. Morita, Sapporo Gakuin Univ., Sapporo, JAPAN
C. Ciofi degli Atti, Univ. of Perugia, ITALY
L.P. Kaptari, BLTP JINP, Dubna, RUSSIA
1.Motivations
1. Validity of Standard Model of nuclei.
2. Nucleon propagation in the medium.
3. Nucleon properties in the medium. (form factors, NN correlations, etc.)
(e,e’p) reaction from few-nucleon system is one of the most effective tool.
To clarify ….
Theoretical analysis of 3He(e,e’p)2H(pn) and 4He(e,e’p)3H data recently produced at JLAB.
< Subject of my talk >
2.Framework of the Calculation for the A(e,e’p)B Reaction
)E,( 6
mmDeppe
SKdpddd
dp
nuclear distorted spectral functione-N cross section
25
)( σ
mDeppe
Kddd
dp
If “B”(recoil system) is bound state
* We use Factorization Ansatz.
nucleon distorted momentum distribution
distorted by FSI
< Cross Section of A(e,e’p)B >
We release it at Section 5
)(
),(),()(),(
3
33
2
2
HeDm
f
M
HeGMD
immD
EEE
ddSeES m
rρρrρrrp ρp
Nuclear Distorted Spectral Function in 3He(e,e’p)2H(pn) process
3He(e,e’p)2H
)(
),(),()()2(
),(
3
33
121
2
2
3
3
HeN
m
f
M
HeGnpsi
mmD
EM
E
ddSed
ES m
t
rρρrρrrt
p tρp
3He(e,e’p)pn
SG: Glauber Operator
P
P
nr
ρt=(Pp-Pn)/2
33
M
He : Pisa Group’s w.f. with AV18
pot.A. Kievsky et al., Nucl. Phys. A551(1993) 241
C. Ciofi degli Atti, L.P. Kaptari, Phys. Rev. C71, 024005 (2005)
Generalized Eikonal Approximation ( GEA ) L.L.Frankfurt et al., Phys. Rev. C56, 1124(1997) and M.M. Sargsian et al., Phys. Rev. C71 044614(2005)C. Ciofi degli Atti, L.P. Kaptari, Phys. Rev. C71, 024005 (2005)
Conventional Glauber Approximation
Generalized Eikonal Approximation
P
P
n
q,ω
P
P
n
q,ω Frozen Approximation
Consider the Fermi motion
Diagramatic representation of the process 3He(e,e’p)2H(pn)
fNNfNN
PWIA
+ +
)1(GEAS : Single Resc.
)2(GEAS : Double Resc. )0(S : IA
)(
),()(),(
3
33
23
2)2()1()0(
23
He
fm
f
M
HeGEAGEAf
mmD
EEE
ddSSSES
rρρrrp
Calculating each graphs, we get SGEA(i) No free parameters !
L.L.Frankfurt et al., Phys. Rev. C56, 1124(1997) and M.M. Sargsian et al.
Double resc.Single resc.
3.Results of 3He(e,e’p) 2H(pn) ReactionC. Ciofi degli Atti, L.P. Kaptari, Phys. Rev. Lett. 95, 052502 (2005)
Q2~ 1.55(GeV/c)2, x=1
Data: JLab E89044
M.M. Rvachev et al., Phys. Rev. Lett. 94(2005) 192302
GEA Calculation reproduces the data almost perfectly.
2bbu channel
Results of 3He(e,e’p) pn 3bbu channel
C. Ciofi degli Atti, L.P. Kaptari, Phys. Rev. Lett. 95, 052502 (2005)
Q2~ 1.55(GeV/c)2, x=1
Data: JLab E89044
F. Benmokhtav et al., Phys. Rev. Lett. 94(2005) 082325
GEA Calculation reproduces the data quite well.
<Saclay Kinematics>
At Parallel Kinem. FSI small
NN correlation can be studied.
4. Results of 4He(e,e’p)3H Reaction - JLab E97-111: B. Reitz et al., Eur. Phys. J. A S19(2004) 165 -
C. Ciofi degli Atti, L.P. Kaptari and H. Morita, Nucl.Phys. A782(2007) 191
Perpendicular Kinem.
Q2=1.78(GeV/c) ω=0.525(GeV)
agreement is quite good.
)1(σ
)(n 5
D ccKddd
dp ep
pem
HeH 43 , ATMS w.f.
Same Calc. for 4He
5. Non factorized cross section: Results of 3He(e,e’p)2H
C. Ciofi degli Atti and L.P. Kaptari, nucl-th/0705.3951
Current Operator: cc1
(no p/q expansion)Full Calc.in momentum space
Breaking down of the Fact. App. at large negative pm > 300(Mev/c)
i
mmAiiMott
m
EQWVddEd
d),,,(
''2
3
6
pp
0
Data: JLab E89044
First Calc.
Left-Right Asymmetry ATL
)180()0(
)180()0(
TLA
Calc. for 4He is now in progress
C.Ciofi degli Atti, L.P.Kaptari and H.Morita, to appear
Data can not be reproduced completely.
Detailed study is going on.
6. Summary-1Without any free parameters, the data of 3He(e,e’p)2H(pn) and 4He(e,e’p)3H were well reproduced by the GEA calculation.1. Validity of standard model of nuclei.
2. Nucleon propagation in the medium.
3. Nucleon properties in the medium.
OK, for JLAB energies.
Can be described by the generalized Glauber type operator.
No apparent changes of nucleon properties at JLAB energies.
At proper (parallel) kinematics we can study NN correlations.
Summary-2
• We performed a non Factorization calculation (in momentum space) for 3He(e,e’p)2H process and found that the violation of Factorization approximation is appreciable at negative pm> 300(MeV/c).
Extension to 4He(e,e’p)3H process is now in progress.