Logo image
Search for Higgs and Z boson decays to J/psi or Y pairs in the four-muon final state in proton-proton collisions at √s = 13 TeV
Journal article   Open access   Peer reviewed

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

Albert M. Sirunyan, Željko Antunović, Vuko Brigljević, Saša Ceci, Dinko Ferenček, Duje Giljanović, Nikola Godinović, Krešo Kadija, Marko Kovač, Damir Lelas, …
Physics letters. B, Vol.797, 134811
10/10/2019
DOI: 10.1016/j.physletb.2019.134811
url
https://doi.org/10.1016/j.physletb.2019.134811View
Published (Version of record) Open Access

Abstract

A search for decays of the Higgs and Z boson to pairs of J/psi or Y(nS)(n = 1, 2, 3) mesons, with their subsequent decay to mu(+)mu(-) pairs, is presented. The analysis uses data from proton-proton collisions at root 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/psi pair channel, the limits are 1.8 x 10(-3) and 2.2 x 10(-6) for the Higgs and Z boson, respectively, while in the combined Y(nS) pair channel, the limits are 1.4 x 10(-3) and 1.5 x 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.
Physics

Details

Metrics

Logo image