2010/06/22 by HERMES collaboration, A. Airapetian, Н. Акопов +162 · 4 citations
Chemistry · Physics and Astronomy · #Amplitude #Atomic physics #Chemistry #Deep inelastic scattering #Electron #Hadron #High-Energy Particle Collisions Research #Inelastic scattering #Meson #Nuclear physics #Nucleon #Particle physics #Particle physics theoretical and experimental studies #Physics #Pion #Polarization (electrochemistry) #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Scattering #hep-ex
paper · pdf · doi:10.1016/j.physletb.2010.08.012
published as Phys.Lett.B693:11-16,2010 · 7 pages, 3 figures
arxiv created 2010/06/22 · openalex publication_date 2010/08/12 · arxiv updated 2014/11/21 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Single-spin asymmetries for pions and charged kaons are measured in semi-inclusive deep-inelastic scattering of positrons and electrons off a transversely nuclear-polarized hydrogen target. The dependence of the cross section on the azimuthal angles of the target polarization (ϕS) and the produced hadron (ϕ) is found to have a substantial sin(ϕ+ϕS) modulation for the production of π+, π− and K+. This Fourier component can be interpreted in terms of non-zero transversity distribution functions and non-zero favored and disfavored Collins fragmentation functions with opposite sign. For π0 and K− production the amplitude of this Fourier component is consistent with zero.