Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session Q17: Collider and BSM III
10:45 AM–12:33 PM,
Monday, April 15, 2019
Sheraton
Room: Grand Ballroom II
Sponsoring
Unit:
DPF
Chair: Matthew Bellis, Siena College
Abstract: Q17.00002 : Searches for exotic decays of the Higgs Boson to a pair of light resonances with the ATLAS detector
10:57 AM–11:09 AM
View Presentation Abstract
Presenter:
Christopher Robyn Hayes
(Stony Brook University)
Author:
Christopher Robyn Hayes
(Stony Brook University)
Collaboration:
ATLAS
Exotics decays of the Higgs boson provide a unique window for the discovery of new physics, as the Higgs may couple to hidden-sector states that do not interact under the Standard Model gauge transformations. Models predicting exotic Higgs decays to pseudoscalars can explain the galactic center gamma-ray excess, if the additional pseudoscalar acts as the dark matter mediator. This talk presents recent ATLAS searches for decays of the 125 GeV Higgs boson to a pair of new light bosons, H -> aa, where the a-bosons decay to various final states. These searches use LHC collision data at sqrt(s) = 13 TeV collected by the ATLAS experiment in 2015 and 2016. Upper limits on the branching ratio σ(H)/σ(SM) x Br(H -> aa) are set in the a-boson mass range between 1–60 GeV. Finally, a comparison of other ATLAS search channels is presented to illustrate the strength of each analysis in probing new physics.
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