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Can New Physics Hide inside the Proton?

Stefano Carrazza1, Celine Degrande2, Shayan Iranipour3

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This summary is machine-generated.

This study disentangles beyond the standard model (BSM) dynamics from proton parton distribution functions (PDFs) using deep-inelastic scattering data. It quantifies BSM effects and their impact on PDF fits and SMEFT constraints.

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Area of Science:

  • Particle Physics
  • High-Energy Physics
  • Quantum Field Theory

Background:

  • Proton structure analyses at high energies probe beyond the Standard Model (BSM) physics.
  • Parton distribution functions (PDFs) are crucial for understanding proton structure.
  • BSM effects can influence PDF determinations, complicating interpretations.

Purpose of the Study:

  • To simultaneously determine proton PDFs and BSM effects.
  • To quantify the impact of BSM dynamics on PDF fits.
  • To assess how BSM effects modify constraints within the Standard Model Effective Field Theory (SMEFT).

Main Methods:

  • Utilized deep-inelastic structure function data.
  • Employed the NNPDF framework for simultaneous fitting.
  • Considered representative four-fermion operators from SMEFT.

Main Results:

  • Successfully disentangled BSM effects from PDFs.
  • Quantified the modification of PDFs due to BSM dynamics.
  • Assessed the impact of BSM effects on SMEFT parameter bounds.

Conclusions:

  • Demonstrated a method to systematically separate BSM physics from proton PDFs.
  • Established a framework for joint PDF and BSM determination.
  • Improved the precision of SMEFT constraints by accounting for BSM contributions.