Search for the decay Bs0→π0π0 at Belle
                        
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            An amplitude analysis of decays is performed using proton-proton collision data, corresponding to an integrated luminosity of , collected with the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV. A resonant structure of spin-parity is observed in the invariant-mass spectrum with a significance of . The mass and width of the state, modeled with a Breit-Wigner line shape, are determined to be and , respectively, where the first uncertainties are statistical and the second systematic. These properties and the quark content are consistent with those of the open-charm tetraquark candidate observed previously in the final state of the decay. This result confirms the existence of the state in a new decay mode. The state, reported in the decay, is also searched for in the invariant-mass spectrum of the decay, without finding evidence for it. © 2025 CERN, for the LHCb Collaboration2025CERNmore » « less
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