Quark Correlations and Quark Correlations and Single Spin Asymmetry Single Spin Asymmetry G. Musulmanbekov JINR, Dubna, Russia e-mail:[email protected]Contents •Introduction •Strongly Correlated Quark Model (SCQM) •Spin in SCQM •Single Spin Asymmetry •Conclusions SPIN’05
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Contents Introduction Strongly Correlated Quark Model (SCQM) Spin in SCQM Single Spin Asymmetry
Quark Correlations and Single Spin Asymmetry G. Musulmanbekov JINR, Dubna, Russia e-mail:[email protected]. Contents Introduction Strongly Correlated Quark Model (SCQM) Spin in SCQM Single Spin Asymmetry Conclusions SPIN’05. Introduction. Where does the Proton Spin come from? Spin "Crisis“: - PowerPoint PPT Presentation
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Quark Correlations and Single Quark Correlations and Single Spin Asymmetry Spin Asymmetry
Destructive Interference of color fields Phase rotation of the quark w.f. in color space:
Colorxig
Color xex )()( )(
Phase rotation in color space dressing (undressing) of the quark the gauge transformation chiral symmetry breaking (restoration)
);()()( xxAxA
here
)0,0,0,( A
Chiral Symmerty Breaking and its Restoration
Consituent Current Quarks Consituent Quarks Asymptotic Freedom Quarks
t = 0x = xmax
t = T/4x = 0
t = T/2x = xmax
During the valence quarks oscillations:
...321132113211 gqqqcqqqqqcqqqcB
Parameters of SCQM
in pp_
2.Maximal Displacement of Quarks: xmax=0.64 fm,
3.Constituent quark sizes (parameters of gaussian distribution): x,y=0.24 fm, z =0.12 fm
,36023
1)( max)( MeV
mmxM N
QQ
Parameters 2 and 3 are derived from the calculations of Inelastic Overlap Function (IOF) and in and pp – collisions.
1.Mass of Consituent Quark
Structure Function of Valence Quarks in Proton
Summary on SCQM
• Quarks and gluons inside hadrons are strongly correlated;
• Constituent quarks are identical to solitons.• Hadronic matter distribution inside hadrons is
fluctuating quantity resulting in interplay between constituent and current quarks.
• Strong interactions between quarks are nonlocal: they emerge as the vacuum response (radiation field) on violation of vacuum homogeneity by embedded quarks.
• Parameters of SCQM:1. Maximal displacement of quarks in hadrons x 0.64f
2. Sizes of the constituent quark: x,y 0.24f, z 0.12f
• Hadronic matter distributions inside nucleons are deformed (oblate).
Inelastic Overlap Function
sxxM 21
+ energy – momentum conservation
Monte-Carlo Simulation of Inelastic Events
Spin in SCQM
a
rd )(3 BErJJ gQ
Our conjecture: spin of consituent quark is entirely analogous to the angular momentum carried by classical circularly polarized wave:
Classical analog of electron spin – F.Belinfante 1939; R. Feynman 1964; H.Ohanian 1986; J. Higbie 1988.
Electron surrounded by proper electric E and B fields creates circulating flow of energy:
S=ɛ₀c²E×B.
Total angular momentum created by this Pointing’s vector
is associated with the entire spin angular momentum of the electron. Here if a = 2/3 r0.entiire mass of electron is contained in its field.
a
rd )((...) 3 BErLs
Spin in SCQM
a
rd )((...) 3chchgQ BErLs
1. Now we accept that
Sch = c²Ech× Bch .
3. Total angular momentum created by this Pointing’s vector
is associated with the entire spin angular momentum of the constituent quark.
A},{ A
and intersecting Ech and Bch create around VQ color
analog of Pointing’s vector
4. Quark oscillations lead to changing of the values of Ech and Bch : at the origin of oscillations they are concentrated
in a small space region around VQ. As a result hadronic current is concentrated on a narrow shell with small
radius.
2. Circulating flow of energy carrying along with it hadronic matter is associated with hadronic matter current.
7. At small displacements spins of both u – quarks inside the proton are predominantly parallel.
8. Velocity field is irrotational:
Analogue from hydrodynamics
((∂ξ)/(∂t))+ ×(ξ×v)=0,∇
ξ= ×v,∇
∇⋅v=0,
const.srv d
r/1v
This means that sea quarks are not polarized
5. Quark spins are perpendicular to the plane of oscillation.
6. Quark spin module is conserved during oscillation:
Single Spin Asymmetry in proton – proton collisions
• In the factorized parton model
'' // qqqqp Df
)(),,(
),,(cos
),(),(
3/
2
/2
/2
3
hkzphzPDhddz
d
Pddd
ryfrddykxfkddxpd
d
qqh
q
prpq
Xpp
0
pq
pqpq
pq
pqq
f
ff
f
fP
/
//
/
/
where
Single Spin Asymmetry in proton – proton collisions