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Search for Higgs and Z boson decays to J/ψ or Y pairs in the four-muon final state in proton-proton collisions at √s = 13 TeV
Autori A. M. Sirunyan, S. Lo Meo, et al. (CMS Collaboration)  Anno 2019
Tipologia Articolo Rivista internazionale con referaggio
Abstract A search for decays of the Higgs and Z boson to pairs of J/ψ or Υ(nS) (n = 1, 2, 3) mesons, with their subsequent decay to μ+μ− pairs, is presented. The analysis uses data from proton-proton collisions at s√= 13 TeV, collected with the CMS detector at the LHC in 2017 and corresponding to an integrated luminosity of 37.5 fb−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/ψ 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 Υ(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.
Referenza_Bibliografica Phys. Lett. B 797 (2019) 134811
Riferimento WEB
Unita di Ricerca RADEC
LastUpdate 07/01/2022
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