Large transverse momentum in semi-inclusive deeply inelastic scattering beyond lowest order

Sivers effect in semi-inclusive deeply inelastic scattering

The Sivers function is extracted from HERMES data on single spin asymmetries in semi-inclusive deeply inelastic scattering. Our analysis use a simple Gaussian model for the distribution of transverse parton momenta, together with the flavor dependence given by the leading 1/Nc approximation and a neglect of the Sivers antiquark distribution. We find that within the errors of the data these appr...

Semi-inclusive deeply inelastic scattering at small qT.

Measurement of the distribution of hadronic energy in the final state in deeply inelastic electron scattering at HERA can provide a good test of our understanding of perturbative QCD. For this purpose, we consider the energy distribution function, which can be computed without needing final state parton fragmentation functions. We compute this distribution function for finite transverse momentu...

Kinematics of Current Region Fragmentation in Semi-Inclusive Deeply Inelastic Scattering

Sivers Effect in Semi-inclusive Deeply Inelastic Scattering and Drell-yan

J. C. COLLINS, A. V. EFREMOV, K. GOEKE, M. GROSSE PERDEKAMP, S. MENZEL, B. MEREDITH, A. METZ, P. SCHWEITZER 1 Penn State University, 104 Davey Lab, University Park PA 16802, U.S.A. 2 Joint Institute for Nuclear Research, Dubna, 141980 Russia 3 Institut für Theoretische Physik II, Ruhr-Universität Bochum, Germany 4 University of Illinois, Department of Physics, Urbana, IL 61801, U.S.A. 5 RIKEN B...

First measurement of the transverse spin asymmetries of the deuteron in semi-inclusive deep inelastic scattering.

First measurements of the Collins and Sivers asymmetries of charged hadrons produced in deep-inelastic scattering of muons on a transversely polarized 6LiD target are presented. The data were taken in 2002 with the COMPASS spectrometer using the muon beam of the CERN SPS at 160 GeV/c. The Collins asymmetry turns out to be compatible with zero, as does the measured Sivers asymmetry within the pr...