Search for feebly interacting particles in missing energy decays at Belle
Sumitted to PubDB: 2024-04-30
Category: Physics / performance paper, Visibility: Public
Tags:
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Authors |
Daniel Marcantonio,
Phillip Urquijo
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Date |
April 30, 2024 |
Belle II Number |
BELLE2-PUB-PH-2024-003 |
Abstract |
Recently, there has been great interest in so-called feebly interacting particles (FIPs) - particles beyond the Standard Model that have small couplings to Standard Model particles. FIPs can arise in several different new physics scenarios, and can be produced in decays of mesons. FIPs can act as portals between the visible and dark sectors, and therefore can decay invisibly. In this letter we report a search for new invisible particles in the channels where , and at a centre-of-mass energy of 10.58 \gev collected by the Belle experiment. No significant signal is observed, and 90\% confidence level on the branching fraction exclusion limits for these decays are derived as a function of the invisible mass, improving constraints by at least an order of magnitude. We also provide constraints on visibly-decaying long-lived particles, set limits on the axion-like particle coupling . |
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