arXiv:0812.4366·v1·High Energy Physics — Phenomenology
Update on transversity and Collins functions from SIDIS and e+ e- data
M. Anselmino (1)🇮🇹 · M. Boglione (1)🇮🇹 · U. D'Alesio (2,3)🇮🇹 · A. Kotzinian (4)🇫🇷 · F. Murgia (3)🇮🇹 · A. Prokudin (1)🇮🇹 · S. Melis (1) ((1) University and INFN, Torino, Italy, (2) University of Cagliari, Italy, (3) INFN, Cagliari, Italy, (4) CEA-Saclay, France, Yerevan Physics Institute, Armenia and JINR, Dubna, Russia)🇮🇹
Abstract
We present an update of a previous global analysis of the experimental data on azimuthal asymmetries in semi-inclusive deep inelastic scattering (SIDIS), from the HERMES and COMPASS Collaborations, and in e+ e- -> h1 h2 X processes, from the Belle Collaboration. Compared to the first extraction, a more precise determination of the Collins fragmentation function and the transversity distribution function for u and d quarks is obtained.
Comments: 10 pages, 10 ps figures, uses espcrc2.sty. Invited talk delivered by U. D'Alesio at the Ringberg Workshop "New Trends in HERA Physics 2008", Ringberg Castle, Tegernsee, Germany, October 5-10, 2008. Submitted to Nucl. Phys. Proc. Suppl