P. Lenisa 1 M. Contalbrigo, A. Drago and M. Contalbrigo, A. Drago and Paolo Lenisa Paolo Lenisa Università di Ferrara and INFN - ITALY Università di Ferrara and INFN - ITALY XIV International Workshop on Deep Inelastic Scattering (DIS 2006) KEK – April 20-24 2006 Transverse Transverse -sea measurements at -sea measurements at JPARC JPARC
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M. Contalbrigo, A. Drago and Paolo Lenisa Università di Ferrara and INFN - ITALY
Transverse -sea measurements at JPARC. M. Contalbrigo, A. Drago and Paolo Lenisa Università di Ferrara and INFN - ITALY. XIV International Workshop on Deep Inelastic Scattering (DIS 2006) KEK – April 20-24 2006. Outline. Introduction Double spin asymmetries in DY at JPARC - PowerPoint PPT Presentation
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P. Lenisa 1
M. Contalbrigo, A. Drago and M. Contalbrigo, A. Drago and Paolo LenisaPaolo LenisaUniversità di Ferrara and INFN - ITALYUniversità di Ferrara and INFN - ITALY
XIV International Workshop on Deep Inelastic Scattering (DIS 2006)KEK – April 20-24 2006
TransverseTransverse-sea measurements at -sea measurements at JPARCJPARC
P. Lenisa 2
OutlineOutline
•Introduction
•Double spin asymmetries in DY at JPARC
•JPARC vs PAX at GSI
•Conclusions
P. Lenisa 3
IntroductionIntroduction
•Helicity distributions of valence quarks (rather) well known
•Helicity distributions of polarized sea poorly known
•Fits:
•Models agree with , disagree on the size
0,0 uu
0u
•Situation more confused for transversity
•Models agree within a factor 2 for
•Even worse for
•Models disagree both on sign of and size.
uh1
uh1
uh1
JPARC: 50 GeV polarized p beam on polarized target:
Double-polarized DY production sensitive to polarized sea (u).