Hayrapetyan, A.Tumasyan, A.Adam, W.Andrejkovic, J. W.Bergauer, T.Chatterjee, S.Zhokin, A.2024-09-112024-09-11202402470-00102470-002910.1103/PhysRevD.109.L1111012-s2.0-85195858537https://doi.org/10.1103/PhysRevD.109.L111101swain, sanjay kumar/0000-0001-6871-3937; Della Ricca, Giuseppe/0000-0003-2831-6982; Tapper, Alexander/0000-0003-4543-864X; Rahatlou, Shahram/0000-0001-9794-3360; Navarrete Ramos, Efren/0000-0002-5180-4020; Wuchterl, Sebastian/0000-0001-9955-9258; Musich, Marco/0000-0001-7938-5684; CERCI, SALIM/0000-0002-8702-6152; Basile, Chiara/0000-0003-4486-6482; Tcherniaev, Evgueni/0000-0002-3685-0635; Radogna, Raffaella/0000-0002-1094-5038; Pesaresi, Mark/0000-0002-9759-1083; Cunqueiro, Leticia/0000-0001-6764-5370; Shchedrolosiev, Mykyta/0000-0003-3510-2093; Sarkar, Tanmay/0000-0003-0582-4167; Dincer, Gizem Gul/0009-0001-1997-2841; Menzio, Luca/0000-0002-9697-5608; Colaleo, Anna/0000-0002-0711-6319; Grunewald, Martin/0000-0002-5754-0388; Cardini, Andrea/0000-0003-1803-0999; Hall, Geoffrey/0000-0002-6299-8385; Perez Dengra, Carlos/0000-0003-2821-4249; Staiano, Amedeo/0000-0003-1803-624X; Calderon, Dr. Alicia/0000-0002-7205-2040The J/psi -> mu(+)mu(-)mu(+)mu(-) decay has been observed with a statistical significance in excess of five standard deviations. The analysis is based on an event sample of proton-proton collisions at a center-of-mass energy of 13 TeV, collected by the CMS experiment in 2018 and corresponding to an integrated luminosity of 33.6 fb(-1). Normalizing to the J/psi -> mu(+)mu(-) decay mode leads to a branching fraction of [10.1(-2.7)(+3.3)(stat) +/- 0.4(syst)] x 10(-7), a value that is consistent with the standard model prediction.eninfo:eu-repo/semantics/openAccess[No Keyword Available]ArticleQ1Q110911WOS:001252843500001