2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/206116The rare decay B0 -> gamma gamma is searched for in 104 fb^-1 of data, corresponding to 111 x 10^6 BBar pairs, collected with the Belle detector at the KEKB asymmetric-energy e+ e- collider. No evidence for the signal is found, and an upper limit of 6.2 x 10^-7 at 90% confidence level is set for the corresponding branching fraction.7 pages, 3 figures, accepted for publication by Phys. Rev. DHigh Energy Physics - Experimenttext