Karlsruhe 2024 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 3: Search for new particles 2
T 3.2: Vortrag
Montag, 4. März 2024, 16:15–16:30, Geb. 20.30: 2.058
Search for the K+ → π+ π0 A decay — •Marco Ceoletta — Johannes Gutenberg University Mainz
This search aims to provide a new state-of-the art estimation for the branching ratio (BR) of the ultra-rare K+ → π+ π0 A decay, where A is Feebly-Interacting Particle (FIP) like an Axion-like particle, at the NA62 experiment (CERN). Obtaining a stringent upper limit on BR(K+ → π+ π0 A) is important for the verification of BSM theories; in particular the BR is sensitive to axial-vector coupling of hypothetical pseudoscalar particles to quarks. A search on K+ → π+ π0 A will therefore complement the extensive work already performed on the associated two-body decay K+ → π+ A, that is sensitive only to the polar-vector coupling current. A preliminary estimation of the BR, as part of a feasibility study done in 2022, already outperformed the best previous limit by two orders of magnitude using less than 20% of the available data. The NA62 search is based on a Monte Carlo event generator exploiting a full differential rate model of the channel. The processing relies on the tried and tested NA62 analysis framework.
Keywords: NA62; Axion like particle; Rare decay