Abstract
A search for decays of the Higgs and Z boson to pairs of J/ψ or Y(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 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
Description
This work is licensed under a Creative Commons Attribution 4.0 International License.
Citation
A.M. Sirunyan et al., "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=13TeV", Physics Letters B, Volume 797, 2019, 134811, ISSN 0370-2693, https://doi.org/10.1016/j.physletb.2019.134811.
(http://www.sciencedirect.com/science/article/pii/S0370269319305210)