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Search for Higgs and Z boson decays to J/? or Y pairs in the four-muon final state in proton-proton collisions at ?s=13TeV

Abstract: A search for decays of the Higgs and Z boson to pairs of J/? or Y(nS) (n = 1, 2, 3) mesons, with their subsequent decay to ?+?? pairs, is presented. The analysis uses data from proton-proton collisions at ?s=13TeV, collected with the CMS detector at the LHC in 2017 and corresponding to an integrated luminosity of 37.5fb?1. While an observation of such a decay with this sample would indicate the presence of physics beyond the standard model, no significant excess is observed. Upper limits at 95% confidence level are placed on the branching fractions of these decays. In the J/? pair channel, the limits are 1.8×10?3 and 2.2×10?6 for the Higgs and Z boson, respectively, while in the combined Y(nS) pair channel, the limits are 1.4×10?3 and 1.5×10?6, respectively, when the mesons from the Higgs and Z boson decay are assumed to be unpolarized. When fully longitudinal and transverse polarizations are considered the limits reduce by about 22?29% and increase by about 10?13%, respectively.

 Fuente: Physics Letters B 797 (2019) 134811

 Editorial: Elsevier

 Fecha de publicación: 01/10/2019

 Nº de páginas: 22

 Tipo de publicación: Artículo de Revista

 DOI: 10.1016/j.physletb.2019.134811

 ISSN: 0370-2693,1873-2445

 Url de la publicación: https://doi.org/10.1016/j.physletb.2019.134811