.
.,
(BLTh, Dubna & INFN, Perugia)
SIDIS off He-3 and Final State Interaction Effects
with
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.,
1. Introduction: “Standard” SIDIS
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Single Spin Asymetry
HERMES, COMPASS, JLAB
Polarized neutron?
Single Target-Spin Asymmetry in Semi-Inclusive p Electroproduction on a Transversely
Polarized 3He Target (JLAB, E03-004(010,011), EPJ Plus, 126 (2011) 2)
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Single Target-Spin Asymmetry in Semi-Inclusive p Electroproduction on a Transversely
Polarized 3He Target (JLAB, E03-004(010,011), EPJ Plus, 126 (2011) 2)
PWIA
What’s PWIA?
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.
g
Q2
n
m
m
p
m
p
.,
p
X
m
p
CdA & LPK Phys.Rev. C66 (2002) 044004
many-body problem
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.,
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.,
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.,
C. Ciofi degli Atti, S. Scopetta, E.Pace, G. Salme, PR.C 48 (1993) 968.
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a) A realistic spin-dependent spectral function of 3He within the AV18
interaction and w.f. by the Pisa group (A. Kievsky et al., NPA 577, 511 (1994). )
b) Parameterizations of data for pdfs and fragmentation functions whenever
available
c) Models for the unknown pdfs and fragmentation functions.
S. Scopetta, Phys.Rev. D75 (2007) 054005
full – “free” neutron (input)
dot - extracted without prt
dash – extracted with dilution
factors
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Results from q.e. 3He(e,e’)pD, 3He(e,e’)ppn
CdA & LPK, PRL 95, 052502 (2005), R. Schiavilla et al, PRC. 72 064003 (2005), L. Frankfurt, M. Sargsian, M. Strikman
Int. J.Mod. Phys. A23 (2008) 2291
M.M. Rvachev et al., PRL 94(2005) 192302
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1
2
3
4
5
etc
FACTORIZATION
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CdA &LPK Phys.Rev.Lett. 100 (2008) 122301
Color string model + gluon radiation
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M. Alvioli, CdA & LPK PRC 81 (Rapid Comm.) (2010) 02100, R. Schiavilla et al, PRC. 72 064003 (2005),
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NEUTRON
PROTON
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DILUTION FACTORS
PWIA:
FSI:
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Extracted Asymmetries
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1
PWIA describes data fairly well at low and moderate intrinsic
momenta (up to 250-300 MeV/c)
2
PWIA + GEA describes data in the whole kinematical
region in q.e. (s = sNN) high energy e.m. processes off 3He
3
PWIA + GEA with factorization adequately describes unpolarized
spectator SIDIS (s = seff (t,Q2,xBj) ) at intrinsic momenta
up to 400-500 MeV/c
4
Since in the “standard” SIDIS processes one integrates over undetected
removal energy and momenta (from 0 to infinity) the PWIA + GEA
(s = seff (t,Q2,xBj) ) with factorization can be applied to extarct free
Information information also from polarized SIDIS processes
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Tagging the Nucleon Structure in the “Spectator” SIDIS
C. Ciofi degli Atti, L. P.K., S. Scopetta, EPJA 5 (1999) 191; PRC 83 (2011) 044602,;
C. Ciofi degli Atti, L.P.K. , B. Kopeliovich, EPJ A19, (2004), 133 C. Ciofi degli Atti, L. P.K., and
C. Mezzeti Fizika B20 (2011) 161
CLAS, Phys.Rev. C89 (2014) 4, 045206, Phys.Rev. C90 (2014) 5, 059901
L. P.K., A. Del Dotto, E. Pace, G. Salm`e, S.Scopetta., PRC 89 (2014) 035206
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Tagging the Nucleon Structure in the “Spectator” SIDIS
e’
e’
e
X
N
N
N
N
N
A=D
(A-1)
Deeps(BONUS)
CLAS, PRC89 (2014) 4, 045206,
PRC90 (2014) 5, 059901
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Tagging the Nucleon Structure in the “Spectator” SIDIS
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Tagging the Hadronization Mechanism
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Tagging the Spin Dependent Spectral Function
L. P.K., A. Del Dotto, E. Pace, G. Salm`e, S.Scopetta., PRC 89 (2014) 035206
AV18
AV18
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AV18
AV18
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Tagging the EMC-effect
C. Ciofi degli Atti, L. P.K., S. Scopetta, EPJA 5 (1999)
191; CdA, LPK, PRC 83 (2011) 044602,;
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27
28
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q.e. 3He(e,e’)pD
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.,
Multiple Scattering Contributions
CdA & LPK, PRL 95, 052502 (2005), R. Schiavilla et al, PRC. 72 064003 (2005)
dσ(pm) has
different (three)
slopes
PWIA
Single
Double
JLAB, 17 Apr. 2013
different Multiple
Scattering
Components
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JLAB, 17 Apr. 2013
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JLAB, 17 Apr. 2013
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.,
3bbu
6
-2
-2
d s/dEe'de' dp' dEm [pb Mev sr ]
3
He(e,e'p)pn (SACLAY kinem.)
15
12
9
6
3
0
3
p' = 60
JLAB 89084
PWIA
PWIA+FSI
o
p' = 90.5
o
PWIA
PWIA+FSI
2
1
0
2
p' = 112
PWIA
PWIA+FSI
o
1
0
0
20
40
60
80
100
Em [MeV]
CdA & LPK, PRL 95, 052502 (2005), L. Frankfurt, M. Sargsian, M.
Strikman Int. J.Mod. Phys. A23 (2008) 2291
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“II” means along SA
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