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Area of Science:

  • Particle Physics
  • Cosmology
  • Quantum Field Theory

Background:

  • Fundamental physical constants are typically derived assuming the Standard Model (SM) of particle physics.
  • New Physics (NP) beyond the SM can influence these derivations, potentially compromising the reliability of NP bounds and constant values.

Purpose of the Study:

  • To develop a consistent method for simultaneously determining both SM and NP parameters.
  • To provide a prescription for analyzing light vector new physics, like the dark photon.
  • To investigate the impact of new physics on current data tensions, particularly the proton charge radius.

Main Methods:

  • A global fit approach is employed to simultaneously determine SM and NP parameters.
  • A leading-order calculation is developed for light vectors with QED-like couplings.
  • The influence of light scalar contributions with flavor nonuniversal couplings is analyzed.

Main Results:

  • A consistent method for simultaneously fitting SM and NP parameters is established.
  • A prescription is provided for analyzing dark photon contributions, recovering photon degeneracy in the massless limit.
  • Inclusion of a light scalar with flavor nonuniversal couplings can alleviate current data tensions, including those related to the proton charge radius.

Conclusions:

  • Simultaneous determination of SM and NP parameters offers a more reliable approach than traditional methods.
  • The proposed methods provide a framework for incorporating new physics into precision measurements.
  • Addressing data tensions may require considering specific types of new physics, such as light scalars.