Tuesday, April 12, 2005, 11:00 am — Small Seminar Room, Bldg. 510
Single-spin asymmetries (SSA) in the azimuthal distribution of lepto-produced hadrons around the virtual photon direction are a valuable tool to explore transverse spin and momentum degrees of freedom in the nucleon structure. Such asymmetries in semi-inclusive deep-inelastic scattering with unpolarized beam and with both w.r.t. the
beam direction longitudinally and transversely polarized targets have been observed at HERMES. These can shed light on the last unmeasured leading twist forward distribution function, the so-called transversity distribution. Furthermore a new class of distribution and fragmentation
functions, transverse momentum unintegrated functions, play a vital role in SSA. Two especially intriguing functions are the T-odd Collins fragmentation function and the T-odd Sivers distribution function, last one was believed to vanish for a long time. The latest results of HERMES
will be presented showing evidence for both signals: transversity in conjunction with the Collins fragmentation function, and the Sivers distribution function. Furthermore, combining the data sets on longitudinally and transversely polarized hydrogen allows the extraction
of the purely subleading-twist contribution to the longitudinal single-spin asymmetries.
Hosted by: Les Bland
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