# Probing for high momentum protons in $^4$He via the $^4He(e,e'p)X$ reaction

## TL;DR

This paper reports experimental measurements of high missing momentum protons in helium-4, revealing more multi-nucleon correlations than predicted by current theoretical models, thus challenging existing nuclear interaction theories.

## Contribution

It provides new experimental data on high momentum protons in helium-4 and compares these with RDWIA calculations, highlighting discrepancies that suggest stronger multi-nucleon correlations.

## Key findings

- More events observed in the triton mass region at high missing momentum.
- Discrepancy between experimental data and RDWIA predictions.
- Indication of stronger initial-state multi-nucleon correlations.

## Abstract

Experimental cross sections for the $^4He(e,e'p)X$ reaction up to a missing momentum of 0.632 GeV/$c$ at $x_B=1.24$ and $Q^2$=2(GeV/$c$)$^2$ are reported. The data are compared to Relativistic Distorted Wave Impulse Approximation(RDWIA) calculations for $^4He(e,e'p)^3H$ channel. Significantly more events in the triton mass region are measured for $p_{m}$$>$0.45 GeV/$c$ than are predicted by the theoretical model, suggesting that the effects of initial-state multi-nucleon correlations are stronger than expected by the RDWIA model.