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Поляризация Ламбда гиперонов
в эксперименте ГЕРМЕС
С. Л. Белостоцкий
Семинар ОФВЭ 24.04.2012
1
EMC (1988) experiment and spin crisis
Deep Inelastic Scattering (DIS) of
polarized muons on polarized target
Jaffe sum rule based on SU(3) f.s.
and assumption of unpolarized
strange sea (?s=0 )
?? ? 0.12 ? 0.09 ? 0.14 ? 1 !!!
? ? ? 3F ? D ? 0.586 ? 0 .08
? u ? ? u ? 2 F ? 0.928
( ? s ? ? s ? 0)
? d ? ? d ? F ? D ? ? 0.34 2
EMC, SMC, SLAC, HERMES, COMPASS, RHIC
to date
sum rule
Sz ?
1
2
?
1
2
?? ? ?G ? J q ? J g
Hermes result
? ? ? 0.330 ? 0.025 exp ? 0.011 theo ? 0.028 evol
quarks
gluons
orbital motion
? u ? ? u ? 0.842 ? 0.008 exp ? 0.004 theo
? d ? ? d ? ? 0.427 ? 0.008 exp ? 0.004 theo
? s ? ? s ? ? 0.085 ? 0.008 exp ? 0.013 theo
2
? and other hyperon spin structure ? ?
??=0.32 F=0.47 D=0.81
Na?ve CQM
??=1
?u=?d= 0
?s= 1
Jaffe assumption (?sproton=0)
??=0.586 ?u=?d= -0.073 ?s= 0.732
Burkard & Jaffe from EMC result
??=0.12 ?u=?d= -0.23 ?s= 0.58 (?0.04)
Lattice-QCD
?u=?d=-0.02
?s= 0.68 (?0.04)
?u
p(uud) 0.84
n(udd) -0.43
?0(uds -0.16
)
?+(uus) 0.84
?0(uds) 0.375
?-(dds) -0.09
?0(uss) -0.43
? (dss) -0.09
?d
?s
-0.43 -0.09
0.84
-0.16
-0.09
0.64
-0.09
0.375
0.84
-0.09
-0.43
-0.43
-0.43
-0.43
0.84
0.843
Spin transfer to ? in DIS and ? spin structure
?
?
?
PL ' ? P? * D LL ' ? PB D ( y ) D LL '
In one-photon exchange mechanism
In LO QCD
e'
?
e
??
D LL ( x , z ) ?
q
?
?
?
D LL , f (z ) ? f ( x , z ) at Q ? Q
2
hadronization
f
q
p
? ( D ( y ) ? 0.7
Q
2
? 2.41 ( G eV ) for H E R M E S )
2
Here partial spin transfer
X
?
DIS variables
Q
2
? ? (k ? k ')
?
D LL ,f (z ) ?
2
? ? E ?E' y ?
?
E
x ?
Q
2
2M ?
z ?
2
E?
?
? Ff (z )
?
f
?
F (z )
??
??
??
??
Ff ? ( z ) ? Ff ? (z )
Ff ? (z ) ? Ff ? (z )
Linked to ? spin structure in a model
dependent way,
e.g. R.L.Jaffe PRD 1996
Ff ( z ) ? q f ( x )
h
h
4
Reciprocity relation Gribov Lipatov PLB 37 1971
HERA self-polarized positron beam (HERA shutdown in 2007)
E e ? 2 7 .6 G eV
Sokolov-Ternov effect
transverse polarization
spin rotators
longitudinal polarization
Pbeam
40 ? 50 %
5
? and ? detection in HERMES experiment
? limited acceptance for ? (?) hyperon detection
(forward spectrometer) mostly current fragmentation
region XF positive
xF ?
p
10
3
10
2
10
1
?
?
-1.0
-0.5
0.0
?
*
p m ax
? for ? (?) produced within HERMES acceptance
decay kinematics is such that proton (anti proton)
is always leading particle
1.0
xF
x105
?
protons
pions
5
?
in ? proton c.m . fram e
0.5
4
3
2
1
0
0
5
10
15
p, GeV/c
20
6
? and ? events selection
p
?
V1,?
V2
?
V1,e
beam
e
main bgr is ?+ ?- and K ? pairs production;
bgr supression cuts:
? Leading ? rejection
using threshold Cherenkov det. (1996-1997)
or RICH (1998-2007)
? Vertex separation.
Distance between V1 and V2 vertices > 5 cm
7
?,? and Ks invariant mass distributions
3
x10 2,5
3
x10 16
14
12
x10
N? = 76281
? = 1.92 MeV
? = 0.85
2,0
10
3
N? = 11187
12
NKs = 99034
? = 1.85 MeV
? = 0.85
10
? = 5.44 MeV
? = 0.91
8
1,5
8
6
1,0
6
4
4
0,5
2
2
0
1.08
1.10
1.12
????
M(p,? ), GeV
1.14
1.16
0,0
1,08
0
1,10
1,12
???
M(?,? ), GeV
1,14
1,16
0,44
0,48
0,52
+
M(? ,? ), GeV
0,56
8
Beam polarization periodic reversal helps to exclude acceptance effect
Important. Due to periodic beam polarization reversal
final date sample is practically helicity balanced , i.e
PB ?
? P ( t )L ( t )dt
? L ( t )dt
? 0
This essentially simplifies DLL extraction from the data
9
Extraction of DLi components from experimental data sample
dN
d? p
?
dN 0
d? p
?
(1 ? ? P ? k p ) ?
? ? ? p ? ? ? ? 0.642 ? 0.013
dN 0
d? p
(1 ? ? ? PB
?
?
D Li cos ? i ) in ? rest fram e
i? x , y ,z
? ? ? p ? ? ? ? ? 0.642 ? 0.013
unpolarized/ acceptance
polarized /acceptance
2,5
Spectrometer acceptance results in strong
distortion of decay angular distribution,
intensive MC acceptance simulation (COMPSS)
unpolarized/ 4?
polarized / 4?
2,0
1,5
1,0
For beam helicity balance case
PB ? 0
MC simulation of spectrometer acceptance is
not needed, acceptance correction does not
affect measured asymmetries. DLi
components are extracted using
experimental data sample only !!
0,5
0,0
-1,0
A ik ?
Bi ?
?
k ? x , y ,z
D Lk A ik ?
1
Bi
? PB2
i ? x , y, z
P
2
B
N
1
N
?
? ? D ? y ? cos ?
2
?
i
cos ? k
? ?1
N
0,5
1,0
cos ? pL '
?
?
?
? ?P
B
D ? y ? cos ? i ?
? ?1
P
?
?
0,0
?
N
1
-0,5
2
( t )L ( t )dt
?
average over
experimental
data sample
? L ( t )dt
10
Coordinate systems in ? rest frame
? * ? Pt arg et ? ? ? X ,
in ? rest fram e p ? * and ? p t arg et ? p ?
lab
All 3 components of spin transfer D L? i are
extracted from the data in ? hyperon rest
frame using two coordinate system:
I. X,Y,Z with Z along virtual photon momentum
p?
p
X
p? *
Y Y'
Z'
X'
Z
? production
plane
X?,Y?,Z? with Z? along ? momentum (in lab frame)
?
?
II. Z and Z? are used to be Longitudinal spin
transfer axes
X and X? transverse spin transfer axes
Important
Y and Y? components of spin transfer
are compatible with zero due to parity
conservation requirement
11
Results: Integrated spin transfer for ?
Q
2
? 2.14 (G eV ) , y ? 0.64,
2
x ? 0.073,
z ? 0.43,
x F ? 0.30
?
D L x ? 0 . 133 ? 0 . 0039 stat ? 0 . 02 sy st
?
D L y ? 0 . 0037 ? 0 . 0037 stat ? 0 . 02 sy st
?
D L z ? 0 . 147 ? 0 . 038 stat ? 0 . 02 sy st
D L x ? ? 0 . 016 ? 0 . 0042 stat ? 0 . 02 sy st
D L y ? 0 . 0037 ? 0 . 0037 stat ? 0 . 02 sy st
D L z ? 0 . 186 ? 0 . 040 stat ? 0 . 02 sy st
?
D L L ' ? 0 . 187 ? 0 . 040 stat ? 0 . 02 sy st
0.3
?
?
?
?
D L L ' ? 0 . 197 ? 0 . 039 stat ? 0 . 02 sy st
0,3
?
DLx
?
DLx
0,2
0.2
0,1
0.1
-0.3
-0.2
-0.1
-0,3
0.1
0.2
-0,1
0,1
0,2
0.3
?
-0.1
-0,2
DLz
0,3
?
DLz
-0,1
-0,2
-0.2
z axis along p??
-0,3
z axis along p?
-0.3
Spin is transferred along virtual photon momentum
12
12
Results: Dependences on kinematic variables for ? hyperon
0,8
0,8
L' = Z
0,6
L' = Z
?
Longitudinal DLL'
?
Longitudinal DLL'
0,6
0,4
0,2
0,0
-0,2
-0,4
-0,6
0,4
0,2
0,0
-0,2
-0,4
-0,6
0,04
0,08
0,12
0,16
x
0,20
0,2
0,3
0,4
0,5
0,6
z
0,7
0,8
0,8
L' = Z
0,6
?
Longitudinal DLL'
0,6
L' = Z
?
Longitudinal DLL'
0,4
0,2
0,0
-0,2
0,4
0,2
0,0
-0,2
-0,4
-0,4
-0,6
0,4
0,5
0,6
0,7
0,8
y
0,9
-0,6
0,0
0,2
0,4
0,6
xF
13
0,8
?
DLz
?
DLz
False asymmetry control using h+h- and KS
hh
Ks
?
0,6
0,4
0,8
hh
Ks
?
0,6
0,4
0,2
0,2
0,0
0,0
-0,2
-0,2
-0,4
-0,4
D L x ? 0 .0 1 7 ? 0 .0 0 6
hh
D L y ? 0 .0 1 5 ? 0 .0 0 6
hh
0,08
0,12
0,8
0,16
x
hh
Ks
?
0,6
0,2
0,3
0,4
0,5
0,6
0,7
0,8
z
0,6
hh
Ks
?
D L x ? 0.019 ? 0.030
Ks
D L y ? 0.015 ? 0.031
Ks
D L z ? -0.001 ? 0.033
Ks
0,2
0,2
0,0
0,0
-0,2
-0,2
-0,4
-0,4
14
hh
0,4
0,4
-0,6
-0,6
0,20
?
0,04
DLz
?
DLz
-0,6
D L z ? 0 .0 1 2 ? 0 .0 0 6
0,4
0,5
0,6
0,7
0,8
y
0,9
-0,6
-0,1 0,0 0,1 0,2 0,3 0,4 0,5 0,6
xF
14
Simple estimation of spin transfer to ?
?
?
D LL ,f ? ? q f
R.L. Jaffe PRD 54, (1996), C. Boros et al PRD 61, (2000),
Ashery&Lipkin PLB 469 (1993), B.Q.Ma et al PLB 477
Constituent quark model (CQM) ?u=?d=0, ?s=1
Burkard/Jaffe ?u=?d=-0.23, ?s=0.58
SU(3) flavor symmetry ?u=?d=-0.09, ?s=0.47
?
D LL ' ?
?
DLL
Purities
CQM
Bu./Jaf
SU(3)
Lattice QCD
0.6
0.6
?
?f
0.8
0.8
0.4
u
d
s
?
LL ', f
f
Lattice QCD ?u=?d=-0.02, ?s=0.68
1.0
?D
0.2
0.0
0.4
-0.2
0.2
-0.4
0.0
0.0
-0.6
0.1
0.2
0.3
0.08
x
15
0.16
0.24
x
15
Longitudinal spin transfer to ? world data
?
Longitudinal DLL'
0,5
0,0
-0,5
HERMES (L' = Z)
NOMAD (L' = Z)
E665 (L' = Z')
COMPASS (L' = Z)
-1,0
-1,5
-0,8
-0,4
0,0
0,4
xF
16
Longitudinal and transverse
spin transfer to ? world data
1,5
1,5
HERMES (L' = X)
NOMAD (L' = X)
1,0
Longitudinal DLL'
?
?
Transverse DLL'
1,0
HERMES (L' = Z)
HERMES (L' = Z')
NOMAD (L' = Z)
E665 (L' = Z')
COMPASS (L' = Z)
0,5
0,0
0,0
-0,5
-0,5
-0,4
0,5
-0,2
0,0
0,2
0,4
0,6
xF
-0,4
-0,2
0,0
0,2
0,4
0,6
xF
17
Overview of Lambda physics at HERMES
DIS regime
?
?
Q ? 0.8 (GeV )
2
2
Spin transfer coefficient DLL from polarized beam in semi inclusive
? and production
Multiplicity and fragmentation function u-quark to ?
Quasi real (inclusive) photoproduction Q 2 ? 0
?
?
?
Spin transfer coefficient KLL from polarized target to ? or
Spin transfer coefficient DLL from polarized beam to ? or
Transverse ? and polarization, A-dependence of ? polarization
e and ? ( )
detected in
coincidence
N ? ? 80 ?10
3
e not detected,
? ( ) detected
inclusively
N ? ? 0.5 ?10
6
Published:
PhD thesis 7
Measurement of longitudinal spin transfer to Lambda
hyperons in deep inelastic lepton scattering.
Conference proceedings about 25
Phys.Rev.D64:112005,2001.
Longitudinal Spin Transfer to the Lambda Hyperon
in Semi-Inclusive Deep-Inelastic Scattering.
Phys.Rev.D74:072004,2006.
Transverse Polarization of Lambda and anti-Lambda
Hyperons in Quasireal Photoproduction.
Phys.Rev.D76:092008,2007.
To be published :
Draft 88. Final paper on DLL
Draft 83. A-dependens of transverse
Lambda polarization
18
BACKUP SLIDES
19
Purity distributions within HERMES acceptance
Purity and partial spin transfer
?
D LL ( x , z ) ?
?
?
?
D LL ,f (z ) ? f ( x , z )
f
1
?
? D L L (z ) ?
?
f
?
D LL ,f (z )
Calculated using LUND MC
?
? ? f ( x , z )dx
?
2
?f (x, z) ?
e f ' q f ( x ) Ff ( z )
?e
f'
'
2
f'
'
?
f
q f . (x )F (z)
??
f
?1
f
0
20
Results: Integrated spin transfer for ?
Q
2
? 1.98 (G eV ) , y ? 0.71,
2
x ? 0.059,
z ? 0.37 ,
x F ? 0.25
?
?
D L x ? -0.07 ? 0.10 stat ? 0.02 sy st
?
D L y ? 0.05 ? 0.10 stat ? 0.02 sy st
?
D L z ? 0.13 ? 0.09 stat ? 0.02 sy st
D L x ? ? 0 . 1 4 ? 0 . 1 1sta t ? 0 . 0 2 sy st
?
D L y ? 0 . 0 5 ? 0 . 1 0 sta t ? 0 . 0 2 sy st
?
D L z ? 0 . 0 5 ? 0 . 1 0 sta t ? 0 . 0 2 sy st
?
D L L ' ? 0.15 ? 0.10 stat ? 0.02 sy st
?
D L L ' ? 0 . 1 5 ? 0 . 1 1sta t ? 0 . 0 2 sy st
0.1
-0.1
?
0,1
DLx
0.1
0.2
0.3
-0,1
L
DLx
0,1
0,2
L
?
DLz
DLz
-0.1
-0.2
0,3
-0,1
-0,2
z axis along p??
z axis along pL
-0.3
-0,3
21
21
False asymmetry control using h+h- and KS
hh
KS
0.4
0.6
0.2
0.0
0.0
-0.2
-0.2
-0.4
-0.4
-0.6
0.2
0.4
xF
0.4
D L L ' ? 0.023 ? 0.054
Ks
0.05
0.10
0.15
0.20
0.8
?
?
DLL'
0.6
hh
x
?
?
DLL'
0.8
-0.6
0.00
0.6
D L L ' ? 0.021 ? 0.006
hh
KS
0.4
0.2
0.0
?
?
?
0.6
DLL'
0.8
?
DLL'
0.8
hh
KS
0.6
hh
KS
0.4
0.2
0.2
0.0
0.0
-0.2
-0.2
-0.4
-0.4
-0.6
0.4
0.5
0.6
0.7
0.8
0.9
y
-0.6
0.18
0.36
22
0.54
z
22
Multiplicity distribution and fragmentation function
?
n (z) ?
N ? (z)
Ne
??
q
q
?1
?
?
?n
?
q
(z) ?
??
q
?
q
D
q?
2
( z, Q )
q
?
{ P u }q ( z ) ? 1
q
Multiplicity z-distribution
?
{ P u}q ( z ) ?
nq ( z )
D
u?
(z ) ? D
*
?
n (z)
z ?
*
E
?
?m
d?
*
(z )
?
?
Fragmentation function u??
23
Belostotski ?Strangeness polarization?? Trento, Oct.2008
?(?) from hyperon (anti-hyperon) decays (quasi-real photoproduction regime)
Parent particles
Contribution to
? production (%)
String(direct)
40
?0??
18
X? and X0
4
???? ???0 ????
38
Hyperon
Decay mode,
%
Hyperon
yield
Antihyperon
Yield
?0??1116?
p ?? ?63.9?
386000
72000
?0???1193?
?0???100?
19000
5200
X? ?1321?
?0????99?
2500
650
?????1393?
?0?????88?
5700
820
??? ?1388?
?0??? ?88?
6300
1200
24
Belostotski ?Strangeness polarization?? Trento, Oct.2008
XF distributions (semi-inclusive DIS)
Experiment for ? and ?
Pythia MC for ?
10
3
10
2
10
1
?
?
-1.0
-0.5
0.0
0.5
1.0
xF
HERMES is a forward spectrometer
p?(min)~1 GeV
25
Belostotski ?Strangeness polarization?? Trento, Oct.2008
Summary of HERMES data-taking with polarized targets
1994
HERMES test RUN
1995-2000
HERMES RUN I
Longitudinal polarization
year
type
Beam pol. =51%
Lumi H,D pol=259 pb-1
Lumi unpol = 593 pb-1
1995
1996
1997
1998
1999
2000
3He
H
H
D
D
D
target
polar. %
46
76
85
86
83
84.5
(H,D, 3He, 4He, 14N, 20Ne and 84Kr)
2001-2002 HERA lumi upgrade
2002-2007
HERMES RUN II
Beam pol. =36%
Lumi H pol=161 pb-1
Lumi unpol ~ 530 pb-1
Transverse polarization
years
type polar.%
2002-2005 H
78
2006-2007
unpol (RD)
26
Belostotski ?Strangeness polarization?? Trento, Oct.2008
? Angular distribution of decay protons in
? rest frame
dN 0
d? p
? const for 4 ? acceptance
dN
d? p
?
dN 0
d? p
?
(1 ? ? PB eam D LL ' k p )
? ? 0 .6 4 2 ? 0 .0 1 3
for restrict ed acceptance
dN 0
d? p
depends on cos ? pL '
2,5
2,0
Distorted by spectrometer
acceptance
May in principle be calculated
using MC
difficulty to avoid false
asymmetry induced by MC
acceptance simulation
PB=0 PB=DLL?=1
1,5
1,0
0,5
0,0
-1,0
-0,5
0,0
0,5
1,0
cos ?27pL '
P n?
results
Phys Rev. D 2007
(RUN I)
e ? p ? ? ? ? X at ? E ? ? ? 15 . 6 G eV
inclusively detected
Lower ? (lower t)
higher ? polarization
28
Belostotski ?Strangeness polarization?? Trento, Oct.2008
Transverse Lambda polarization A/Z dependence
29
Na?ve Constituent Quark Model nCQM
?
?
?
?
?
low mass spin 1/2(3/2) baryon
8-et (10-et) can be built using
various combination of
u, d, s quarks within
SU(3)_flavor
symmetry model
Magnetic moments of baryons well described, e.g.
It implies that in nCQM
30
PhD theses on lambda physics at HERMES
Longitudinal Polarization of the Lambda in Deep Inelastic Scattering of Polarized
Positrons from Nucleons G. Schnell Ph.D. Thesis, New Mexico State University, May 1999
Messungen zum Spintransfer bei Lambda0-Produktion im polarisierter Lepton-Nukleon
Streuung im HERMES-Experiment S. Bernreuther Dissertation, Friedrich-AlexanderUniversitaet Erlangen-Nuernberg
Investigation of Lambda-hyperon production in deep inelastic positron nucleon
scattering in the HERMES experiment Y. Naryshkin Dissertation, Gatchina 2001
Lambda Hyperon Production Mechanisms and Longitudinal Spin Transfer at HERMES
H.C. Chiang Senior Thesis, University of Illinois at Urbana-Champaign, Sep 2002
Measurement of the Transverse Spin Polarization of the Lambda in Quasi-Real
Photoproduction and Electroproduction at HERMES *PDF format A.E. Andrus Ph.D.
thesis, University of Illinois at Urbana-Champaign, May 2006
Quasi-real photo-production of hyperons and their impact on the Lambda polarization
measurements *PDF format A.J. Reischl PhD thesis University of Amsterdam, April 2007
The polarization of Lambda hyperons in quasi-real photoproduction *PDF format M.
Demey PhD thesis University of Amsterdam, March 2007
Hyperon production at the HERMES experiment *PDF format C. Bonomo Ph.D. thesis,
Universita' degli Studi di Catania, Feb 2007
31
14th International Conference on Particles and Nuclei (PANIC 96)
May 22 - 28, 1996 .......... Williamsburg, USA
S. Belostotski - hadron spectroscopy
Results on Lambda0 Production at HERMES P. Chumney 2nd Topical Work on Deep Inelastic Scattering off Polarized Targets: Theory Meets Experiment (SPIN 97), Zeuthen, Germany, Sep 1 - 5, 1997
Lambda Production at HERMES P. Chumney 7th International Conference on Mesons and Light Nuclei, Pruhonice, Prague, Czech Republic, Aug 31 - Sep 4, 1998
Study of Strange Particle Production in HERMES Experiment S.L. Belostotski 13th International Symposium on High Energy Spin Physics (SPIN 98), Protvino, Russia, Sep 8 - 12, 1998
Strange Particle Production and Polarization of Lambda Hyperons in the HERMES Experiment S. Belostotski 7th International Work on Deep Inelastic Scattering and QCD (DIS 99), Zeuthen, Germany, Apr 19 - 23, 1999
Lambda Polarization Measured at HERMES and Lambda Spin Structure S. Belostotski International Work on Symmetry and Spin (PRAHA-SPIN 99), Prague, Czech Republic, Sep 5 - 12, 1999
Fragmentation Function of Up Quark to Lambda Measured in the HERMES Experiment S. Belostotski, O. Grebenyuk, Y. Naryshkin Workshop on the physics problems of Nucleon Structure and Meson Spectroscopy,
Dubna, Russia, Oct 9 - 15, 2000
Longitudinal Lambda Polarization Measured at HERMES O. Grebenyuk 9th International Work on Deep Inelastic Scattering and QCD (DIS 2001), Bologna, Italy, Apr 27 - May 1, 2001
Longitudinal spin transfer to the Lambda hyperon in lepto-production S. Belostotski IX Workshop on High Energy Spin Physics, Dubna, Russia, Aug 2 - 7, 2001
Transverse polarization of Lambda hyperons produced inclusively in eN-scattering at HERMES S. Belostotski and O. Grebenyuk IX Workshop on High Energy Spin Physics, Dubna, Russia, Aug 2 - 7, 2001
Transverse Polarization of Lambda and Lambda-bar Produced Inclusively in eN Scattering at HERMES O. Grebenyuk 10th International Workshop on Deep Inelastic Scattering and QCD (DIS 2002), Cracow, Poland, Apr
30 - May 4, 2002
Transverse Polarisation of Lambda and Lambda Hyperons in Quasi-Real Photon Nucleon A. Br?ll 15th International Spin Physics Symposium (SPIN02), Brookhaven National Lab, NY, USA, Sep 9 - 14, 2002
10th International Workshop on Deep Inelastic Scattering and QCD (DIS 2002)
Apr 30 - May 4, 2002 .......... Cracow, Poland
Y. Naryshkin ? Study of Lambda hyperon production and longitudinal spin transfer in the HERMES Experiment
MESON2004 Workshop
Jun 4 - 8, 2004 .......... Krakow, Poland
Y. Naryshkin - Hyperon production at HERMES
Hyperon Production at HERMES S. Belostotski 16th International Spin Physics Symposium (SPIN04), Trieste, Italy, Oct 10 - 16, 2004 INFO: Proc. of the 16th Int. Spin Physics Symposium (SPIN), Trieste/I (2005) World
Scientific p.400
Topical Aspects of Hyperon physics S. Belostotski ASI Summer School in Hadron Physics, St. Andrews, Scotland, UK, Aug 22 - Sep 29, 2004 INFO: Proc. of 58th Scottish Universities Summer School in Physics (SUSSP58): A
NATO Advanced Study Institute and EU Hadron Physics 13 Summer Institute, St. Andrews, Scotland IOP Publishing
Measurement of longitudinal spin transfer to the Lambda0-hyperon at HERMES Yu. Naryshkin 7th International Conference on Hyperons, Charm and Beauty Hadrons (BEACH 2006), Lancaster University, Lancaster,
United Kingdom, Jul 2 - 8, 2006 INFO: Nuclear Physics B 167 110-113
Measurement of Transverse Lambda Polarization in Quasi-Real Photoproduction at HERMES
Yu. Naryshkin 15th International Workshop on Deep Inelastic Scattering and QCD (DIS 2007), Munich, Germany, Apr 16 20, 2007 INFO: Proc. of 15th Int. Workshop on Deep-Inelastic Scattering and Related Subjects (DIS07), Sep. 2007. doi:10.3360/dis.2007.95
Lambda and antiLambda polarization and spin transfer in photoproduction at HERMES format D. Veretennikov 12th Workshop on High Energy Spin Physics (DSPIN-07), Dubna, Russia, Sep 3 - 7, 2007 INFO:
Proceedings of XII Advanced Research Workshop on High Energy Spin Physics (DSPIN-07), JINR(2008), p381
SPIN TRANSFER COEFFICIENT KLL? IN Lambda PHOTOPRODUCTION AT HERMES D. Veretennikov 16th International Workshop on Deep Inelastic Scattering and QCD (DIS 2008), London, UK, Apr 7 - 11, 2008 INFO: Proc.
of XVI International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS'08), Sept 2008. doi:10.3360/dis.2008.212
Polarization Effects in Lambda and Anti-Lambda Production at Hermes *PDF format S.Belostotski 18th International Spin Physics Symposium (SPIN 2008), Charlottesville, VA, USA, Oct 6 - 11, 2008 INFO: To be
published by AIP
European Nuclear Physics Conference (ENPC09)
Mar 16 - 20, 2009 .......... Bochum, Germany
Y. Naryshkin - A-dependence of lambda polarisation
Physics at HERMES *PDF format Yu. Naryshkin XIII Workshop on High Energy Spin Physics (DSPIN09), Dubna, Russia, Sep 1 - 5, 2009
Lambda polarization at HERMES *PDF format Yu. Naryshkin BEACH'10: 9th International Conference On Hyperons, Charm And Beauty Hadrons, Perugia, Italy, Jun 21 - 26, 2010
19th International Spin Physics Symposium (SPIN 2010)
Sep 27 - Oct 2, 2010 .......... Juelich, Germany
Yuri N. - Transverse Lambda polarisation
19th International Spin Physics Symposium (SPIN 2010)
Sep 27 - Oct 2, 2010 .......... Juelich, Germany
Denis V. - long. Lambda polarisation
20th International Spin Physics Symposium (SPIN 2010)
April 2011, Newport news Virginia, USA
S.Belostotski Spin transfer in DIS
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