# Measurement of Meson Resonance Production in $\pi^{-} + $C Interactions at SPS energies

## TL;DR

This paper reports measurements of meson resonance spectra in pion-carbon interactions at SPS energies, providing data crucial for modeling hadronic showers and cosmic ray air showers.

## Contribution

It provides new experimental spectra of $
ho^0$, $ ext{ω}$, and K$^{*0}$ mesons at two different energies, enhancing the understanding of resonance production in hadronic interactions.

## Key findings

- Measured $
ho^0$, $ ext{ω}$, and K$^{*0}$ spectra at 158 and 350 GeV/c
- Compared experimental data with hadronic interaction models
- Results improve modeling of cosmic ray air showers

## Abstract

We present measurements of $\rho^0$, $\omega$ and K$^{*0}$ spectra in $\pi^{-} + $C production interactions at 158 GeV/c and $\rho^0$ spectra at 350 GeV/c using the NA61/SHINE spectrometer at the CERN SPS. Spectra are presented as a function of the Feynman's variable $x_\text{F}$ in the range $0 < x_\text{F} < 1$ and $0 < x_\text{F} < 0.5$ for 158 GeV/c and 350 GeV/c respectively. Furthermore, we show comparisons with previous measurements and predictions of several hadronic interaction models. These measurements are essential for a better understanding of hadronic shower development and for improving the modeling of cosmic ray air showers.