Artículo
Spin budget of the proton at NNLO and beyond
Fecha de publicación:
06/03/2019
Editorial:
American Physical Society
Revista:
Physical Review D
ISSN:
2470-0010
e-ISSN:
2470-0029
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We revisit the scale evolution of the quark and gluon spin contributions to the proton spin, 1 2 ΔΣ and ΔG, using the three-loop results for the spin-dependent evolution kernels available in the literature. We argue that the evolution of the quark spin contribution may actually be extended to the four-loop order, and that to all orders a single anomalous dimension governs the evolution of both ΔΣ and ΔG. We present analytical solutions of the evolution equations for ΔΣ and ΔG and investigate their scale dependence both to large and down to lower “hadronic” scales. We find that the solutions remain perturbatively stable even to low scales, where they come closer to simple quark model expectations. We discuss a curious scenario for the proton spin, in which even the gluon spin contribution is essentially scale independent and has a finite asymptotic value as the scale becomes large. We finally also show that perturbative three-loop evolution leads to a larger spin contribution of strange antiquarks than of strange quarks.
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Articulos(SEDE CENTRAL)
Articulos de SEDE CENTRAL
Articulos de SEDE CENTRAL
Citación
de Florian, Daniel Enrique; Vogelsang, Werner; Spin budget of the proton at NNLO and beyond; American Physical Society; Physical Review D; 99; 5; 6-3-2019; 1-12
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