Paul van der Nat (on behalf of the HERMES collaboration)

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Presentation transcript:

Paul van der Nat (on behalf of the HERMES collaboration) First results on two-hadron interference fragmentation on a transversely polarized hydrogen target Paul van der Nat (on behalf of the HERMES collaboration) Layout: Introduction Results on longitudinally polarized target Results on transversely polarized target Status of the analysis Conclusions & Outlook

Introduction - 1p fragmentation Difficulties: extraction of difficult, needs weighting with Sivers & Collins entangled: November 2005 Tokyo Tech

Introduction - 2p fragmentation Integrate over : left with only Advantages: cross section asymmetry directly proportional to (no weigthing needed) No Collins/Sivers “entanglement” Completely independent from 1p analysis Disadvantages: less statistics unknown (but can be measured at Belle & Babar) November 2005 Tokyo Tech

Interference FF Expansion of in Legendre moments: Jaffe et al. [hep-ph/9709322]: describe interference between 2 pion pairs coming from different production channels November 2005 Tokyo Tech

Interference FF Expansion of in Legendre moments: Radici et al. [hep-ph/0110252]: complety different model, not predicting a sign change of the asymmetry around the (times -1 -> trento conventions) based on the spectator model November 2005 Tokyo Tech

The polarized cross sections The AUL & AUT asymmetries are related to these polarized cross sections (subleading twist, Bacchetta et al.): November 2005 Tokyo Tech

before integration over Bacchetta et al. [hep-ph/0212300] November 2005 Tokyo Tech

transversely polarized hydrogen target Single Spin Asymmetry transversely polarized hydrogen target What is measured: November 2005 Tokyo Tech

longitudinally polarized deuterium Hint of a sign change at the r0 mass! November 2005 Tokyo Tech

long. pol. deuterium, x-dependence higher x: hint of sign change at r0 mass according to Jaffe’s model ? November 2005 Tokyo Tech

long. pol. deuterium, z-dependence 2 sign change at r0 according to Jaffe’s model for low z November 2005 Tokyo Tech

The AUT asymmetry Significant behavior! November 2005 Tokyo Tech

Invariant mass dependence see f.i. M. Radici, hep-ph/0510165 positive asymmetry moments for all invariant mass bins result rules out predicted sign change at the r0 mass (Jaffe et al.) Preliminary November 2005 Tokyo Tech

being studied using pythia MC data Status of the analysis Dealing with low statistics: forced to integrate the asymmetry over many variables combined with the HERMES acceptance: watch out for acceptance effects! comparing different fitting methods for the extraction of the azimuthal moments: normal binned 2 fit versus unbinned max. likelihood fit being studied using pythia MC data November 2005 Tokyo Tech

Conclusions & Outlook Conclusions: A (significantly) non-zero asymmetry-moment has been measured providing evidence for a non-zero interference fragmentation function. This also implies that interference fragmentation can be used to study transversity! The new results using a transversely polarized hydrogen target rule out the invariant mass behavior as predicted by R. Jaffe. Outlook: Increase the statistics using the 2005 data Extract asymmetry moment relating to Extract quantitative information on November 2005 Tokyo Tech