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

, The ATLAS collaboration (2014) Search for invisible decays of a Higgs boson produced in association with a Z boson in ATLAS. Physical review letters, 112. ISSN 1079-7114

[img]
Preview
PDF (PhysRevD.90.052001)
PhysRevD.90.052001.pdf - Published Version
Available under License Creative Commons Attribution.

Download (750kB)

Abstract

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<mH<400  GeV, produced in association with a Z boson and decaying to invisible particles.

Item Type:
Journal Article
Journal or Publication Title:
Physical review letters
Additional Information:
Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. © 2014 CERN, for the ATLAS Collaboration
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100
Subjects:
ID Code:
71130
Deposited By:
Deposited On:
07 Oct 2014 08:47
Refereed?:
Yes
Published?:
Published
Last Modified:
01 Dec 2020 02:23