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dc.contributor.author
de Florian, Daniel Enrique
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dc.contributor.author
Vogelsang, Werner
dc.date.available
2021-02-13T01:36:22Z
dc.date.issued
2019-03-06
dc.identifier.citation
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
dc.identifier.issn
2470-0010
dc.identifier.uri
http://hdl.handle.net/11336/125671
dc.description.abstract
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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
American Physical Society
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Spin
dc.subject
Proton
dc.subject.classification
Física de Partículas y Campos
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dc.subject.classification
Ciencias Físicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Spin budget of the proton at NNLO and beyond
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2021-02-09T18:50:30Z
dc.identifier.eissn
2470-0029
dc.journal.volume
99
dc.journal.number
5
dc.journal.pagination
1-12
dc.journal.pais
Estados Unidos
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dc.description.fil
Fil: de Florian, Daniel Enrique. Universidad Nacional de San Martín. Escuela de Ciencia y Tecnología. Centro Internacional de Estudios Avanzados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Vogelsang, Werner. Tübingen University. Institute for Theoretical Physics; Alemania
dc.journal.title
Physical Review D
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1103/PhysRevD.99.054001
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://journals.aps.org/prd/abstract/10.1103/PhysRevD.99.054001
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1902.04636
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