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in inclusive lepton-proton collisions: TMD and twist-3 approaches
We consider the inclusive production of hadrons in lepton-nucleon scattering.
For a transversely polarized nucleon this reaction shows a left-right azimuthal
asymmetry, which we compute this asymmetry in both TMD and in twist-3 collinear
factorization formalisms. All non-perturbative parton correlators of the
calculation are fixed through information from other hard processes. Our
results for the left-right asymmetry agree in sign with recent data for charged
pion production from the HERMES Collaboration and from Jefferson Lab. We
discuss similarities and differences of two formalisms.Comment: 6 pages, 4 figures, to appear in the proceedings of the TRANSVERSITY
2014, Chia, Italy, 9-13 June, 201
Collins Effect from Polarized SIDIS and Data
The recent data on the transverse single spin asymmetry
from HERMES and COMPASS Collaborations are
analysed within LO parton model with unintegrated parton distribution and
fragmentation functions. A fit of SIDIS data from HERMES Collaboration is
performed leading to the extraction of favoured and unfavoured Collins
fragmentation functions. A very good description of COMPASS data is obtained.
BELLE data are shown to be compatible with our estimates based on the
extracted Collins fragmentation functions. Predictions for
asymmetries at JLab and COMPASS operating on a
proton target are given.Comment: Talk presented at SPIN2006, 4 pages, 6 figure
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