Impact of new particles on the ratio of Electromagnetic form factors

TL;DR

This paper investigates how hypothetical new particles could influence electromagnetic form factor ratios in electron-proton scattering, deriving bounds consistent with other experimental constraints.

Contribution

It provides new bounds on scalar and vector couplings of potential new particles affecting electron-proton scattering ratios.

Findings

Scalar coupling bounds: ~10^{-5} for 5 MeV-2 GeV

Vector coupling bounds: ~10^{-5} for 5 MeV-1.1 GeV

Results align with independent experimental constraints

Abstract

We consider the electromagnetic form factors ratio in the Rosenbluth and polarization methods. We explore the impact of adding new particles as the mediators in the electron-proton scattering on these ratios. Consequently, we find some bound on the scalar coupling as $\alpha_{sc}\sim 10^{-5}$ for $m_{sc}\sim 5 MeV-2 GeV$ and $\alpha_{sc}\sim 10^{-4}-10^{-3}$ for $m_{sc}\sim 2-10 GeV$. Meanwhile, the vector coupling is bounded as $\alpha_v\sim 10^{-5}$ for $m_v\sim 5 MeV-1.1 GeV$ and $\alpha_v\sim 10^{-4}-10^{-3}$ for $m_v\sim 1.2-10 GeV$. These constraints are in complete agreement with those which is found from other independent experiments.