# Study of the proton-proton collisions at 1683 MeV/c

## TL;DR

This paper presents new experimental data on proton-proton collisions at 1683 MeV/c, analyzing pion production and partial wave contributions to improve understanding of the underlying reaction mechanisms.

## Contribution

It provides new high-precision data on $pp$ collisions and applies a maximum likelihood analysis to better quantify partial wave contributions in pion production.

## Key findings

- Data agree with OPE model predictions
- Partial wave contributions are quantified with higher precision
- Enhanced understanding of pion production mechanisms

## Abstract

The new data on the elastic $pp$ and single pion production reaction $pp\to pn \pi^{+}$ taken at the incident proton momentum 1683 MeV/c are presented. The data on the $pp\to pn \pi^{+}$ reaction are compared with predictions from the OPE model. To extract contributions of the leading partial waves the single pion production data are analyzed in the framework of the event-by-event maximum likelihood method together with the data measured earlier. The analysis allows us to obtain the assessment with a better precision the contributions from different initial partial waves.