Search for feebly interacting particles in missing energy B decays at Belle

Sumitted to PubDB: 2024-04-30

Category: Physics / performance paper, Visibility: Public

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Authors Daniel Marcantonio, Phillip Urquijo
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 B 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 a in the channels \Bpmha where h\pipm,\Kpm,Ds±,p, and B0\Dzba 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 gaW.

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