spin wg summary - spin experiments -
DESCRIPTION
Spin WG Summary - spin experiments -. DIS2006 in Tsukuba April 24, 2006 Yuji Goto (RIKEN/RBRC). Spin Puzzle. : quark-spin contribution global analysis of DIS and SIDIS data flavor decomposition extension to low- Q 2 transversity G : gluon-spin contribution - PowerPoint PPT PresentationTRANSCRIPT
Spin WG Summary- spin experiments -
DIS2006 in Tsukuba
April 24, 2006
Yuji Goto (RIKEN/RBRC)
April 24, 2006 DIS2006 Spin WG Summary 2
Spin Puzzle
: quark-spin contribution– global analysis of DIS and SIDIS data flavor decomposition extension to low-Q2
transversityG: gluon-spin contribution• L: orbital angular momentum (OAM)
– DVCS– transverse spin asymmetries Sivers function and Collins function
LG 2
1
2
1
April 24, 2006 DIS2006 Spin WG Summary 3P. Mulders
April 24, 2006 DIS2006 Spin WG Summary 4
quark distribution functions and fragmentation functions
• transversity distribution function
– distribution of the transverse-spin of a parton inside the transversely polarized proton
• Sivers distribution function
– correlation between the transverse-spin of the proton and the transverse-momentum of an unpolarized parton inside the proton (pT2)
• Collins fragmentation function
– correlation between the transverse spin of a fragmenting quark and the transverse momentum of the outgoing hadron relative to the quark (kT2)
)()( 1 xhxq T
),( 21 TT pxf
),( 21 TkzH
April 24, 2006 DIS2006 Spin WG Summary 5
experimental talks• transverse spin asymmetries and transversity
– HERMES (L. Pappalardo) COMPASS (H. Fischer)– RHIC PHENIX (K. Tanida) STAR (C. Gagliardi) BRAHMS (J.H. Lee)
polarimeter (A. Bravar)– J-PARC & GSI (P. Lenisa)
• polarized fragmentation functions– BELLE (R. Seidl)– COMPASS (B.Grube)– RHIC STAR (J. Kiryluk)
• DVCS– HERMES (Z. Ye)
G– RHIC STAR (J. Kiryluk, F. Simon) PHENIX (M. Liu, Y. Fukao)– COMPASS (K. Kurek)
• quark/antiquark flavor decomposition– RHIC PHENIX (M. Liu) STAR (F. Simon)
• low-Q2 DIS– COMPASS (M. Stolarski)– JLAB CLAS (V. Dharmawardane, Y. Prok) Hall-A (N. Liyanage) Hall-C
(S. Tajima)
(Convenors: D. Ryckbosch and Y. Goto)
April 24, 2006 DIS2006 Spin WG Summary 6
transverse spin asymmetries and transversity
• HERMES (L. Pappalardo)
• COMPASS (H. Fischer, B. Grube)
• PHENIX (K. Tanida)
• STAR (C. Gagliardi)
• BRAHMS (J.H. Lee)
• RHIC polarimeter (A. Bravar)
• J-PARC & GSI (P. Lenisa)
April 24, 2006 DIS2006 Spin WG Summary 7HERMES (L. Pappalardo)
April 24, 2006 DIS2006 Spin WG Summary 8HERMES (L. Pappalardo)
April 24, 2006 DIS2006 Spin WG Summary 9COMPASS (H. Fischer)
April 24, 2006 DIS2006 Spin WG Summary 10COMPASS (H. Fischer)
April 24, 2006 DIS2006 Spin WG Summary 11PHENIX (K. Tanida)
April 24, 2006 DIS2006 Spin WG Summary 12PHENIX (K. Tanida)
April 24, 2006 DIS2006 Spin WG Summary 13STAR (C. Gagliardi)
April 24, 2006 DIS2006 Spin WG Summary 14STAR (C. Gagliardi)
April 24, 2006 DIS2006 Spin WG Summary 15BRAHMS (J.H. Lee)
April 24, 2006 DIS2006 Spin WG Summary 16BRAHMS (J.H. Lee)
April 24, 2006 DIS2006 Spin WG Summary 17BRAHMS (J.H. Lee)
April 24, 2006 DIS2006 Spin WG Summary 18
HERMES COMPASS
proton Collins Sivers deuteron Collins Siversp+ positive positive h+ zero zerop- negative zero h- zero zero
K+ zero positive
K- positive? zero
PHENIX STAR BRAHMS
h+ midrapidity zero p+ forward positive
h- midrapidity zero p- forward negativep0 midrapidity zero p0 forward positive K+ forward positive
neutron 0-deg negative p0 backward zero K- forward positive
proton forward zero
anti-p forward positive
April 24, 2006 DIS2006 Spin WG Summary 19RHIC polarimeter (A. Bravar)
April 24, 2006 DIS2006 Spin WG Summary 20RHIC polarimeter (A. Bravar)
April 24, 2006 DIS2006 Spin WG Summary 21RHIC polarimeter (A. Bravar)
April 24, 2006 DIS2006 Spin WG Summary 22RHIC polarimeter (A. Bravar)
April 24, 2006 DIS2006 Spin WG Summary 23J-PARC & GSI (P. Lenisa)
April 24, 2006 DIS2006 Spin WG Summary 24
polarized fragmentation functions
• BELLE (R. Seidl)
• COMPASS (B. Grube)
• STAR (J. Kiryluk)
April 24, 2006 DIS2006 Spin WG Summary 25BELLE (R. Seidl)
April 24, 2006 DIS2006 Spin WG Summary 26COMPASS (B. Grube)
April 24, 2006 DIS2006 Spin WG Summary 27COMPASS (B. Grube)
April 24, 2006 DIS2006 Spin WG Summary 28STAR (J. Kiryluk)
April 24, 2006 DIS2006 Spin WG Summary 29
DVCS
• HERMES (Z. Ye)
April 24, 2006 DIS2006 Spin WG Summary 30HERMES (Z. Ye)
April 24, 2006 DIS2006 Spin WG Summary 31HERMES (Z. Ye)
April 24, 2006 DIS2006 Spin WG Summary 32
G
• STAR (J. Kiryluk, F. Simon)
• PHENIX (M. Liu, Y. Fukao)
• COMPASS (K. Kurek)
April 24, 2006 DIS2006 Spin WG Summary 33STAR (J. Kiryluk)
April 24, 2006 DIS2006 Spin WG Summary 34PHENIX (Y. Fukao)
April 24, 2006 DIS2006 Spin WG Summary 35COMPASS (K. Kurek)
April 24, 2006 DIS2006 Spin WG Summary 36
quark/antiquark flavor decomposition
• RHIC PHENIX (M. Liu)
• STAR (F. Simon)
April 24, 2006 DIS2006 Spin WG Summary 37PHENIX (M. Liu)
April 24, 2006 DIS2006 Spin WG Summary 38STAR (F. Simon)
April 24, 2006 DIS2006 Spin WG Summary 39
low-Q2 DIS
• COMPASS (M. Stolarski)
• JLAB CLAS (V. Dharmawardane, Y. Prok)
• JLAB Hall-A (N. Liyanage)
• JLAB Hall-C (S. Tajima)
April 24, 2006 DIS2006 Spin WG Summary 40COMPASS (M. Stolarski)
April 24, 2006 DIS2006 Spin WG Summary 41JLAB CLAS (Y. Prok)
April 24, 2006 DIS2006 Spin WG Summary 42JLAB CLAS (Y. Prok)
April 24, 2006 DIS2006 Spin WG Summary 43JLAB CLAS (Y. Prok)
April 24, 2006 DIS2006 Spin WG Summary 44JLAB Hall-A (N. Liyanage)
April 24, 2006 DIS2006 Spin WG Summary 45JLAB Hall-A (N. Liyanage)
April 24, 2006 DIS2006 Spin WG Summary 46JLAB Hall-C (S. Tajima)
April 24, 2006 DIS2006 Spin WG Summary 47JLAB Hall-C (S. Tajima)
April 24, 2006 DIS2006 Spin WG Summary 48
Summary
• We are still accumulating data to understand the nucleon spin structure
• W production data, low-Q2 data, …
G• RHIC, COMPASS
– L (OAM)• transverse spin asymmetries from both lepton-
scattering and hadron-scattering data