1. Nuclear Physics Seminar

    "Measuring Transverse Quark Polarization with Spin Dependent Fragmentation Functions"

    Presented by Anselm Vossen, Indiana University

    Tuesday, March 5, 2013, 11 am
    Small Seminar Room, Bldg. 510

    Hosted by: Oleg Eyser

    The spin structure of the proton provides stringent tests of our understanding of QCD in the hadronic sector. In a collinear picture at leading twist, three distribution functions are needed for its description. One of these, the so called transversity distribution function is only poorly known due to its chiral odd nature which means it is inaccessible in inclusive measurements. Currently the only experimental way transversity can be accessed is using fragmentation functions that are sensitive to the quark transverse polarization. This talk will focus on the extraction of transverse spin dependent di-hadron interference fragmentation functions at the Belle experiment. Our results can be used to extract transversity from recent STAR and PHENIX data on di-hadron correlations in p+p collisions and have been used for the first extraction of transversity from semi-inclusive deep-inelastic scattering in a collinear framework. I will give an overview of the measurement of polarized and unpolarized fragmentation functions at Belle and an outlook to our plans at Belle II.