Bounds on new light particles from high-energy and very small momentum transfer np elastic scattering data

TL;DR

This paper establishes constraints on new light particles, particularly spin-one types, using high-energy neutron-proton elastic scattering data, and compares these bounds with other experimental limits.

Contribution

It provides new bounds on spin-one light particles from high-energy scattering data and compares them with existing low-energy and decay experiment bounds.

Findings

Strong bounds on spin-one particles from high-energy data

Weaker bounds for scalar particles

No bounds for pseudoscalar particles

Abstract

We found that spin-one new light particle exchanges are strongly bounded by high-energy and small momentum transfer np elastic scattering data; the analogous bound for a scalar particle is considerably weaker, while for a pseudoscalar particle no bounds can be set. These bounds are compared with the bounds extracted from low-energy n-Pb scattering experiments and from the bounds of pi0 and K+ meson decays.