Can New Physics Hide inside the Proton?

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

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

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
Volume123
Issue number13
DOIs
Publication statusPublished - 26 Sep 2019

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partons
distribution functions
physics
protons
degrees of freedom
fermions
operators
probes
energy

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Carrazza, S., Degrande, C., Iranipour, S., Rojo, J., & Ubiali, M. (2019). Can New Physics Hide inside the Proton? Physical Review Letters, 123(13), 1-6. [132001]. https://doi.org/10.1103/PhysRevLett.123.132001
Carrazza, Stefano ; Degrande, Celine ; Iranipour, Shayan ; Rojo, Juan ; Ubiali, Maria. / Can New Physics Hide inside the Proton?. In: Physical Review Letters. 2019 ; Vol. 123, No. 13. pp. 1-6.
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Carrazza, S, Degrande, C, Iranipour, S, Rojo, J & Ubiali, M 2019, 'Can New Physics Hide inside the Proton?' Physical Review Letters, vol. 123, no. 13, 132001, pp. 1-6. https://doi.org/10.1103/PhysRevLett.123.132001

Can New Physics Hide inside the Proton? / Carrazza, Stefano; Degrande, Celine; Iranipour, Shayan; Rojo, Juan; Ubiali, Maria.

In: Physical Review Letters, Vol. 123, No. 13, 132001, 26.09.2019, p. 1-6.

Research output: Contribution to JournalArticleAcademicpeer-review

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Carrazza S, Degrande C, Iranipour S, Rojo J, Ubiali M. Can New Physics Hide inside the Proton? Physical Review Letters. 2019 Sep 26;123(13):1-6. 132001. https://doi.org/10.1103/PhysRevLett.123.132001