The Short Version
The claim is directionally grounded but asserts unverified specifics. The 2026 Breakthrough Prize in Fundamental Physics was indeed awarded to the Muon g-2 collaborations, and Dr. Atanu Nath appears on at least one institutional laureate listing as a collaboration member. However, the precise figure of "376 researchers" is not confirmed by the official Breakthrough Prize body or major institutional sources, which instead cite "roughly 400" or list no specific headcount. The false precision and lack of official corroboration make the claim as stated misleading.