Dortmund 2021 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 77: QCD II
T 77.8: Vortrag
Donnerstag, 18. März 2021, 17:45–18:00, Tb
LHCb for astroparticle physics: The Muon Puzzle in air showers and its connection to the LHC — •Hans Dembinski1, Julian Boelhauve1, Johannes Albrecht1, Bernhard Spaan1, and Michael Schmelling2 — 1Experimentelle Physik 5, TU Dortmund — 2Max Planck Institut für Kernphysik, Heidelberg
The Muon Puzzle is a central issue for the ground-based observation of astroparticles. It refers to a lack of muons produced in simulated air showers initiated by cosmic rays in comparison to measurements. Progress has been made in recent years to confirm the muon discrepancy with high significance and to theoretically trace its origin to features of hadron-nuclear interactions in air showers (most muons are produced at the end of a hadronic cascade). Air shower simulations use state-of-the-art hadronic models tuned to the latest LHC data, which cover hadron production at mid-rapidity in great detail. The tuning does not solve the puzzle, which suggests "missing physics" in these models regarding the forward production of light hadron in high-energy hadron-nucleus collisions, which dominate the evolution of air showers but are not sufficiently studied at the LHC.
We will review evidence for the Muon Puzzle, the connection between muon production in air showers and hadron production, and which measurements at the LHC have the potential to solve the puzzle. The focus will be placed on the unique opportunities offered by LHCb measurements of proton-nucleus collisions. Running the LHC with oxygen beams to study proton-oxygen collisions is of key importance to achieve these goals.