# Precision resonance energy scans with the PANDA experiment at FAIR -- Sensitivity study for width and line-shape measurements of the X(3872)

## TL;DR

This study uses Monte Carlo simulations to evaluate the precision of resonance energy scans with the PANDA experiment, focusing on measuring the width and line-shape of the exotic X(3872) state, demonstrating PANDA's unique capabilities.

## Contribution

It provides the first detailed sensitivity analysis for natural width and line-shape measurements of narrow resonances like X(3872) with PANDA.

## Key findings

- PANDA can measure the width and line-shape of narrow resonances with high precision.
- Sensitivity depends on signal cross-sections, input widths, and luminosity configurations.
- PANDA is uniquely capable of scanning narrow states with non-$J^{PC} = 1^{--}$ quantum numbers.

## Abstract

This paper summarises a comprehensive Monte Carlo simulation study for precision resonance energy scan measurements. Apart from the proof of principle for natural width and line-shape measurements of very narrow resonances with PANDA, the achievable sensitivities are quantified for the concrete example of the charmonium-like $X(3872)$ state discussed to be exotic, and for a larger parameter space of various assumed signal cross-sections, input widths and luminosity combinations. PANDA is the only experiment that will be able to perform precision resonance energy scans of such narrow states with quantum numbers of spin and parities that differ from $J^{PC} = 1^{--}$.