2017/02/02 by Franco Bradamante, Bradamante, Franco
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph
paper · pdf · doi:10.48550/arxiv.1702.00621
4 pages, 3 figures, Proceedings of the $22^{nd}$ International Spin Symposium
arxiv created 2017/02/02 · openalex publication_date 2017/02/02 · arxiv updated 2017/02/03 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The SIDIS transverse spin asymmetries weighted with powers of PT, the hadron transverse momentum in the γN reference system,have been introduced already twenty years ago and are considered quite interesting. While the amplitudes of the modulations in the azimuthal distribution of the hadrons are the ratios of convolutions over transverse momenta of the transverse--momentum dependent parton distributions and of the corresponding fragmentation functions, and can be evaluated analytically only making assumptions on the transverse--momentum dependence of these functions, the weighted asymmetries allow to solve the convolution integrals over transverse--momenta without those assumptions. Using the high statistics data collected in 2010 on transversely polarized proton target COMPASS has evaluated in x-bins the PT weighted Sivers asymmetry which is proportional to the product of the first transverse moment of the Sivers function and of the fragmentation function. The results are compared to the standard unweighted Sivers asymmetry.