The Upgrade II of the LHCb muon detector

LHCb is one of the large experiments operating at the LHC collider, mainly dedicated to b quark physics studies. To date, it contributed significantly to the Flavor Physics and Electroweak Physics in the forward region, thanks to its excellent performance during the LHC Runs 1 and Run 2, at an instantaneous luminosity Lpeak = 4 x 1032 cm-2s-1. The apparatus has recently been upgraded to efficiently work at Lpeak = 2 x 1033 cm-2s-1 for the current Run 3 data taking. Moreover, the further luminosity increase planned for the LHC Run 5 will open up new opportunities for LHCb in the field of precision flavor physics and physics beyond the Standard Model, making necessary the Upgrade II of the apparatus. From 2035, LHCb is expected to work at Lpeak = 1.5 x 1034 cm-2s-1, collecting 300 fb-1 data. Several options are under study for the muon detector Upgrade II, aiming to manage such an increase in luminosity and the expected rates of incident particles, while preserving its excellent muons detection efficiency. In this article, the state of the art of the muon detector Upgrade II is presented.