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The Study of the Deuteron Spin Structure in Reaction of Polarized Deuteron
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Transcript of The Study of the Deuteron Spin Structure in Reaction of Polarized Deuteron
SPIN-Praha-2004
The Study of the Deuteron Spin StructureThe Study of the Deuteron Spin Structure in Reaction of Polarized Deuteronin Reaction of Polarized Deuteron Fragmentation in Cumulative Pions .Fragmentation in Cumulative Pions .
A.Litvinenko
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for SPHERE Collaboration
VBLHE, JINR, DUBNA
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Outline.Outline.
Motivation:Deuteron breakup Cumulative pions productionResults: Experimental Method Results and Theoretical Models SummaryDiscussion and future plans
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Deuteron breakup (Some experience)
• Spectrum
• Relativistic effects + IA+rescatt.
• Polarization observables
Exp. Data can not be described
by IA+rescatt.
New degrees of freedom ?
More sophisticated DWF?
X)o0P(θP(A))D( D
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A.P.Kobushkin, Proc. of the Int.Symp.
“Dubna Deuteron-93”,p.71,Dubna,1993
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RIA Paris DWF; RIA+FSI Paris DWF
G.I.Lykasov,EPAN, v.24,p.59,(1993)
k(GeV/c)
20T
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Cumulative pions (Some experience)
Relativistic effects + IA+ new deg. of freedom
diff.
cros
s se
ct.
IARIA
RIA +6q(4%)A.Illarionov, A.Litvinenko,
G.Lykasov, Yad.Fiz.,
v.66,p.1, (2003)
data--A.M.Baldin et al,Nucl.Phys. A434,p.695,(1985)
X)o180 ,o0π(θP(A) D
CX
const)NN(
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Tensor Analyzing Power 20T
Data presentation; Cumulative Scale variable
Reason – Scaling of cross section
2Nttb
2b
Cm)PP()PP(
2/m)PP(X
2Nbtb
2t
Cm)PP()PP(
2/m)PP(X
Typical value
78.070.0pzz
)Tp22
11( 20zz
0
X)o0π(θP(A) D
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Squares --
Circles-- CD
Trian. Down--
CD
Trian. Up --
CD
BeD
Black - - 9.0 —6.2 GeV/c , = 3 Gev/c S.V.Afanasiev et al., Nucl.Phys.,A 625,p.817 (1998)
Red - -9.0 GeV/c , - 3.5—5.3 GeV/c
S.Afansiev et al., Phys.Lett., B445,p.14,(1998)
DP P
Blue - -5.0 Gev/c, -1.4—2.3 GeV/c (SPHERE preliminary)
DP
DP
P
P
CX
20T
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Blue -- Paris DWF
Red -- Paris DWF + const)NN( A.Yu.Illarionov,A.G.Litvinenko,G.I.Lykasov, Eur.Phys.J,A14,p.247,(2002)
20T
CX
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Tensor Analyzing Power yyA
Xmrd) 135,180π(θP(A) D
))(Ap21
)(Ap23
1)(()( yyzzyz0
-- will not be discussed here
20yy T2A;0
yA
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Lilac Black
.mrd180,c/GeV9PD
Blue .mrd135,c/GeV9PD .mrd180,c/GeV5PD (Preliminary)
CX
yyA
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yyA
)c/GeV(PT
TP Dependence
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Initial Energy Dependence
CX
20T
c/GeV9PD
c/GeV5PD
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CX
Blue c/GeV5PD
c/GeV5PD Red
yyA
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Summary
The Data for and have been obtained 20T
In the Reaction: Xπ(θ)A D 180,135,0 mrd., 9,5PD GeV/c
A Dependence – not visible for light nuclei
TP Dependence – strong up to ( ~-0.4 )
yyA
yyA
Initial Energy Dependence – weak
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Discussion and plan Relativistic effects (MRS ?)
x – t = 0. (one variable)
-- Internal Mom.K
DP
X
DP
P
X
Hard Scattering Spectator
22T
2N2 m
)x1(x4qm
K
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RIA + Exotics
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yyA
K
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Light-Front Dynamics (V.A.Karmanov)
x – t = 0. 0;0;0)x( 02
22T
2N2 m
)x1(x4qm
K
22T
2N2 m
)x1(x4qm
K
)x1(xqm
)x21
()nk(2T
2N
{
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Example
L.S.Azhirei,N.P.Yudin,7thInt.Workshop,.p.159, Stara Lesna, Sloval Rep., (2003 ).
Will be published in Yad.Fiz.
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Spectator
Hard Scattering
qdOAyy
OAyy
The second variable can be important at 00
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Feature plans
Kaons
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Nuclotron and Polarized Deuteron
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Yu.S.Anisimov et al., Part. And Nucl. Lett.
No.1[118],p.68,2004