info:eu-repo/semantics/article
Evidence for Polarization of Gluons in the Proton
Fecha
2014-07Registro en:
de Florian, Daniel Enrique; Sassot, Rodolfo; Stratmann, Marco; Vogelsang, Werner; Evidence for Polarization of Gluons in the Proton; American Physical Society; Physical Review Letters; 113; 7-2014; 1-5; 012001
0031-9007
Autor
de Florian, Daniel Enrique
Sassot, Rodolfo
Stratmann, Marco
Vogelsang, Werner
Resumen
We discuss the impact of recent high-statistics Relativistic Heavy Ion Collider data on the determination of the gluon polarization in the proton in the context of a global QCD analysis of polarized parton distributions. We find evidence for a nonvanishing polarization of gluons in the region of momentum fraction and at the scales mostly probed by the data. Although information from low momentum fractions is presently lacking, this finding is suggestive of a significant contribution of gluon spin to the proton spin, thereby limiting the amount of orbital angular momentum required to balance the proton spin budget.