# Poincare' covariant light-front spectral function and transverse momentum distribution

## TL;DR

This paper derives the light-front spectral function and transverse momentum distributions for fermions in the valence approximation, linking them to light-front wave functions and clarifying their twist structure.

## Contribution

It provides explicit expressions for transverse momentum distributions from light-front wave functions and relates twist-three distributions to leading twist transverse distributions.

## Key findings

- Explicit formulas for transverse momentum distributions derived
- Twist-three distributions expressed as linear combinations of leading twist distributions
- Clarification of the relation between fermion correlator and spectral function in valence approximation

## Abstract

In valence approximation the fermion correlator is simply related to the light-front spectral function. Then the leading twist time-reversal even transverse momentum distributions can be explicitly obtained from the light-front wave function of the system and the twist-three distributions are linear combinations of the transverse distributions at leading twist.