summary of the spin physics session
DESCRIPTION
Summary of the Spin Physics session. -- experimental part --. Delia Hasch. (spin) structure of the nucleon. “ You think you understand something? Now add spin…” -- R. Jaffe. K. Krysztof A. Korzenev L. De Nardo K. Griffion P. Cole K. Slifer. @6GeV. polarised structure functions: g 1. - PowerPoint PPT PresentationTRANSCRIPT
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Summary of theSpin Physics session
-- experimental part --
Delia Hasch
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(spin) structure of the (spin) structure of the nucleonnucleon
K. KrysztofA. KorzenevL. De NardoK. GriffionP. ColeK. Slifer
@6GeV
“You think you understand something? Now add spin…” -- R. Jaffe
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polarised structure polarised structure functions: gfunctions: g11
proton, deuteron neutron[L. De Nardo]
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[L. De Nardo K. Krysztof]
polarised structure polarised structure functions: gfunctions: g11
Q2>1GeV2
(theory) (exp) (evol) = 0.330 ± 0.011 ± 0.025 ± 0.028
a0=MS
a0=
= 0.35 ± 0.03(stat) ± 0.05(sys+evol)
MS
@Q2=5GeV2
@Q2=3GeV2
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helicity distributionshelicity distributionsvalence quark distributions: uvdv
from semi-inclusive difference asymmetry:)(d)(u
)(d)(u)(A
vv
vvhhd xx
xxx
first SIDIS result from COMPASS!
[A. Korzenev]
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spin structurespin structure
EG1/4/12 @CLAS
• resonance region • GDH SR
Q2 (GeV2)0Q2 • study of high x• prove of duality• determination of HT …
[K. Griffion, K. Slifer]
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(spin) structure of the (spin) structure of the nucleonnucleon
P. Liebing
S. Koblitz
K. Okada
R. Fatemi
F. Simon
J. Lajoie
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-0.1
0
0.1
0.2
0.3
0.001 0.01 0.1 1
AAC06
GRSV
BB
LSS
-0.6-0.4-0.2
00.20.40.60.8
11.21.4
0.001 0.01 0.1 1
x
xg(x)
Q2 = 1 GeV2
x(x)
AACBB
GRSV
LSS
gluon polarisation gluon polarisation
from scaling violation:
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gluon polarisation gluon polarisation “direct” measurements:
Photon-Gluon Fusion (PGF)
• golden channel: charm productiongolden channel: charm production
• hadron production at high Phadron production at high PTT
[P. Liebing, S. Koblitz]
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gluon polarisation gluon polarisation “direct” measurements: polarised pp @RHIC :
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gluon polarisation gluon polarisation “direct” measurements: polarised pp @RHIC :
2005 data
ALL for , , J/
[K. Okada, R. Fatemi, F. Simon]
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Di-jets: directly xg
gluon polarisation gluon polarisation “direct” measurements: polarised pp @RHIC FUTURE:
2006: 7.5 pb-1 @60% polarisation
projections
upgrade programme
[K. Okada, R. Fatemi, F. Simon, J. Lajoie]
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(spin) structure of the (spin) structure of the nucleonnucleon
R. Seidl
M. Diefenthaler
A. Bressan
U. D’Alesio
O. Eyser
S. Heppelmann
J. Lee
J. Balitsky
C. Schill
A.Kotzinian
transversity&friendstransversity&friends
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first glimpsefirst glimpse of transversity of transversity global fit of data from BELLE(FF ), HERMES and COMPASS(DFxFF )
e-
e+
Collins fragmentation function AUT sin(s)
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global fit of data from BELLE(FF ), HERMES and COMPASS(DFxFF )
Collins fragmentation function
first glimpsefirst glimpse of transversity of transversity
[U. D’Alesio]
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new data:
global fit of data from BELLE(FF ), HERMES and COMPASS(DFxFF )
29 fb-1 547 fb-1
full data set with transv. target:
,K
,K
first glimpsefirst glimpse of transversity of transversity
[U. D’Alesio]
[R. Seidl, M. Diefenthaler, A. Bressan]
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full data set
transversitytransversity
[M. Diefenthaler, A. Bressan]
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Sivers Sivers
implies non-zero Lq
[M. Diefenthaler, A. Bressan]
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leftright
transversity&friends transversity&friends @@RHIC RHIC
Xhpp
• K ,p,p-bar
0
2006: P~60%
[J. Lee, O. Eyser, S. Heppelmann, J. Balewski]
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leftright
transversity&friends transversity&friends @@RHIC RHIC
Xhpp
• K ,p,p-bar
0
2006: P~60%• jet back-to-back correlations Sivers• two hadron correlation transversity …
[J. Lee, O. Eyser, S. Heppelmann, J. Balewski]
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(spin) structure of the (spin) structure of the nucleonnucleon
H. Guler
A. Rostomyan
A. Mussgiller
E. Voutier
J. Pierce
HallA, CLAS
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hunting for Lhunting for Lqq
10-30%(DIS)10-30%(DIS)
( H + E) x dx = JJqq
= = 1/2 1/2 LLzz
Q2
t
Generalised Parton Distributions
hard exclusive processes:
Q2>>, t<<
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e+/- p → e+/- p X<1.7 GeVin HERMES acceptance
Regge, D-term
Regge, no D-term
fac., D-termfac., no D-term
γpepe ''/-
DVCSDVCS beam beam chargecharge asymmetry asymmetry
[PRD75(2007)]
20xmore e statistics on tape from 2005/06
1998 e
data set10 pb-1
[A. Mussgiller]
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hunting for Lhunting for Lqq GPD: E GPD: Eobservables:
AUT 0
DVCS
DVCS cross section on neutron
HallA
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hunting for Lhunting for Lqq GPD: E GPD: E
AUT
0L
[A. Rostomyan, A. Mussgiller, E. Voutier]
x
DVCS
t (GeV2) x Q2 (GeV2)
xB=0.36, Q2=1.91 GeV2
HallA
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hunting for Lhunting for Lqq
model dependent constraint of Ju vs Jd
[A. Mussgiller, E. Voutier]
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much more much more polarisation observables polarisation observables
• transverse polarisation
• determining the spin structure of resonances• transverse spin of the pion• hydrogen hyperfine splitting …
[Y. Naryshkin, P. Cole, J. Pierce]
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spin physics is a very active spin physics is a very active fieldfield
thanks to all the participants of the Spin Session for this fruitful meeting
Daniel, Gerhard & Delia
[apologises to all speakers not covered in this summary]