Can New Physics Hide inside the Proton?

Stefano Carrazza, Celine Degrande, Shayan Iranipour, Juan Rojo, Maria Ubiali

Research output: Contribution to JournalArticleAcademicpeer-review


Modern global analyses of the structure of the proton include collider measurements which probe energies well above the electroweak scale. While these provide powerful constraints on the parton distribution functions (PDFs), they are also sensitive to beyond the standard model (BSM) dynamics if these affect the fitted distributions. Here we present a first simultaneous determination of the PDFs and BSM effects from deep-inelastic structure function data by means of the NNPDF framework. We consider representative four-fermion operators from the SM effective field theory (SMEFT), quantify to which extent their effects modify the fitted PDFs, and assess how the resulting bounds on the SMEFT degrees of freedom are modified. Our results demonstrate how BSM effects that might otherwise be reabsorbed into the PDFs can be systematically disentangled.

Original languageEnglish
Article number132001
Pages (from-to)1-6
Number of pages6
JournalPhysical Review Letters
Issue number13
Publication statusPublished - 26 Sep 2019


Dive into the research topics of 'Can New Physics Hide inside the Proton?'. Together they form a unique fingerprint.

Cite this