POEMMA-Balloon with Radio: A multi-messenger, multi-detector balloon payload
J.Adams, J.Alfaro, D.Allard, P.Alldredge, R.Aloisio, R.Ammendola, A.Anastasio, L.Anchordoqui, D.Badoni, J.Bal\'a\v{z}, B.Baret, L.Bar-On, M.Battisti, R.Bellotti, M.Bertaina, M.Betts, S.Blin, M.Boezio, P.Bo\v{r}il, J.Brague, I.Buckland, J.Burton Heibges, F.S.Cafagna, P.Cao

TL;DR
POEMMA-Balloon with Radio (PBR) is a balloon-borne experiment designed to validate space-based UHECR detection techniques, perform multi-messenger observations, and enhance understanding of high-energy cosmic phenomena.
Contribution
It introduces a compact balloon-based version of the POEMMA concept, combining optical and radio measurements for multi-messenger astrophysics at high energies.
Findings
First simultaneous optical Cherenkov and radio observations of high-altitude air showers.
Validation of fluorescence detection strategy from suborbital altitudes.
Potential to study energy spectrum and composition at PeV energies.
Abstract
A review of the current status of the field of Ultra-High-Energy Cosmic Ray (UHECR) including a summary of remaining open questions was presented in the white paper "Ultra-High Energy Cosmic Rays: at the Intersection of the Cosmic and Energy Frontiers" (Astropart. Phys. 147 (2023) 102794; arXiv:2205.05845). The authors concluded that two types of next-generation detectors are needed to answer these questions: high-accuracy instruments and detectors that maximize exposure at the highest energies. The Probe Of Extreme Multi-Messenger Astrophysics (POEMMA), a proposed dual-satellite observatory, exemplifies the latter class and is designed to increase statistics of the highest-energy cosmic rays and to detect very-high-energy neutrinos following multi-messenger alerts. POEMMA-Balloon with Radio (PBR) implements a compact, balloon-borne version of the POEMMA concept, adapted for a…
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