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

litvin@moonhe.jinr.ru

Spin-Praha-2004

for SPHERE Collaboration

VBLHE, JINR, DUBNA

SPIN-Praha-2004

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

SPIN-Praha-2004

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