Evidence for polarization of gluons in the proton

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 mom...

Descripción completa

Guardado en:
Detalles Bibliográficos
Autores principales: De Florian, D., Sassot, R., Stratmann, M., Vogelsang, W.
Formato: JOUR
Materias:
Budget control
Colliding beam accelerators
Polarization
Gluon polarization
Momentum fraction
Orbital angular momentum
Parton distributions
Proton spins
Relativistic Heavy Ion Collider
Protons
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00319007_v113_n1_p_DeFlorian
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
Descripción
Sumario: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. © 2014 American Physical Society.

Ejemplares similares