We show that any determination of the strong coupling alpha s from a process which depends on parton distributions, such as hadronic processes or deep-inelastic scattering, generally does not lead to a correct result unless the parton distributions (PDFs) are determined simultaneously along with alpha s. We establish the result by first showing an explicit example, and then arguing that the example is representative of a generic situation which we explain using models for the shape of equal chi 2 contours in the joint space of alpha s and the PDF parameters

Why alpha. cannot be determined from hadronic processes without simultaneously determining the parton distributions / S. Forte, Z. Kassabov. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - 80:3(2020 Feb 28). [10.1140/epjc/s10052-020-7748-6]

Why alpha. cannot be determined from hadronic processes without simultaneously determining the parton distributions

S. Forte
Primo
;
2020

Abstract

We show that any determination of the strong coupling alpha s from a process which depends on parton distributions, such as hadronic processes or deep-inelastic scattering, generally does not lead to a correct result unless the parton distributions (PDFs) are determined simultaneously along with alpha s. We establish the result by first showing an explicit example, and then arguing that the example is representative of a generic situation which we explain using models for the shape of equal chi 2 contours in the joint space of alpha s and the PDF parameters
Settore FIS/02 - Fisica Teorica, Modelli e Metodi Matematici
Settore FIS/04 - Fisica Nucleare e Subnucleare
   Proton strucure for discovery at the Large Hadron Collider (NNNPDF)
   NNNPDF
   EUROPEAN COMMISSION
   H2020
   740006
28-feb-2020
Article (author)
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/716799
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