Search for invisible decays of a Higgs boson produced in association with a Z boson in ATLAS

By Atlas Collaboration. 2014

211 citations recorded by the source corpus.

A search for evidence of invisible-particle decay modes of a Higgs boson produced in association with a Z boson at the Large Hadron Collider is presented. No deviation from the standard model expectation is observed in 4.5 fb−1 (20.3 fb−1) of 7 (8) TeV pp collision data collected by the ATLAS experiment. Assuming the standard model rate for ZH production, an upper limit of 75%, at the 95% confidence level is set on the branching ratio to invisible-particle decay modes of the Higgs boson at a mass of 125.5 GeV. The limit on the branching ratio is also interpreted in terms of an upper limit on the allowed dark matter-nucleon scattering cross section within a Higgs-portal dark matter scenario. Within the constraints of such a scenario, the results presented in this Letter provide the strongest available limits for low-mass dark matter candidates. Limits are also set on an additional neutral Higgs boson, in the mass range 110

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/8ac3f917aa51663e19af40c4855a59dc8621f874

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Nuclear and High Energy Physics

Citations in the corpus

Search for new phenomena in final states with an energetic jet and large missing transverse momentum in pp collisions at root s=8 TeV with the ATLAS detector (2015, methodology): “The strongest direct bounds from the LHC experiments on the branching ratio for the Higgs invisible decay mode [59,60] set upper limits of 58 %–65 % at 95 % conﬁdence level (CL), based on the ﬁnal state in which the Higgs boson is produced either in association with a Z boson or via vector-boson…”
Measurements of the Higgs boson production and decay rates and coupling strengths using pp collision data at \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\o (2015, unknown): “5 Invisible final states can be directly searched for through the Emiss T signature [28].”
Combination of searches for invisible decays of the Higgs boson using 139 fb−1 of proton-proton collision data at s=13 TeV collected with the ATLAS experiment (2023, unknown): “The level of residual non-orthogonality was evaluated by considering both the data events and signal samples for all the Higgs boson production modes.”
Physics beyond colliders at CERN: beyond the Standard Model working group report (2019, background): “In fact in presence of an additional pseudoscalar particle that mediates the interactions of DM with the SM sector [301, 302], constraints from direct detection experiments [303–306] and invisible Higgs width [307, 308] on the scalar portal can be easily evaded [301, 302].”