APS April 2022

Session

BSM I

9 Apr 2022, 11:00

US

115. Search for Dark Matter Produced in Association with a Dark Higgs Boson Decaying to two b-quarks Using full Run-2 data set from the ATLAS detector

Qibin Liu (Tsung-Dao Lee Institute, Shanghai Jiao Tong Univ. (CN) & Univ. of Washington Seattle (US))

09/04/2022, 11:00

Oral presentation

A hypothetical dark Higgs boson was proposed in a dark matter (DM) model to explain the origin of mass in dark sector as well as to open up new annihilation channel relaxing the DM relic density constraint from cosmological observation. The search focusing on Majorana DM produced with a low mass dark Higgs boson decaying to two b-quarks is proposed and working in progress using the 139fb-1...

108. Search for Dark Matter produced in association with a Higgs boson decaying to a pair of b quarks and combination of Dark Matter search with 2HDM+$a$ with the ATLAS detector

Jay Chan (University of Wisconsin Madison (US))

09/04/2022, 11:20

Oral presentation

Dark Matter (DM) searches are of great importantance to the LHC program. In this talk, I will first present a DM search using the Higgs boson as a portal. This search targets events that contain large missing transverse momentum and either two $b$-tagged small-radius jets or a single large-radius jet associated with two $b$-tagged sub-jets. No significant excess with respect to the SM...

81. Search for dark mesons decaying to top and bottom quarks in 139 fb-1 of proton-proton collision data at √s = 13 TeV with the ATLAS detector at the LHC.

Galen Gledhill (University of Oregon (US))

09/04/2022, 11:40

Oral presentation

Extending the Standard Model (SM) with a new strongly coupled dark sector can generate models with both an experimentally accessible dark meson production mechanism and a viable dark matter candidate particle. A search for dark mesons is presented in an integrated luminosity of 139 $\mathrm{fb^{-1}}$ of proton-proton collision data at a center of mass energy of 13 TeV with the ATLAS detector...

79. Search for Heavy (pseudo)Higgs boson A/H produced in association with a top-antitop quark pair leading to the final state with four top quarks in $pp$ collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector

Meng-Ju Tsai (University of Michigan)

09/04/2022, 11:40

Oral presentation

Four top-quark production, a rare process in the Standard Model (SM) with a cross-section around 12 fb, is one of the heaviest final states produced at the LHC, and it is naturally sensitive to physics beyond the Standard Model (BSM). A data excess is observed with twice of the expectation. A follow-up analysis is the search for Heavy (pseudo)Higgs boson A/H produced in association with a...

84. Search for neutral long-lived particles decaying into displaced jets in the ATLAS calorimeter

Mason Proffitt (University of Washington (US))

09/04/2022, 11:40

Oral presentation

New long-lived particles are a feature of many extensions to the Standard Model and may elude searches for promptly decaying particles. An analysis of data collected in $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector at the Large Hadron Collider is described, focusing on identifying signatures of jets produced by long-lived particles decaying to Standard Model fermions within...

87. Search for the pair production of vector-like quarks in the Wq+X fianl state with the full Run 2 ATLAS dataset

Evan Richard Van De Wall (Oklahoma State University (US))

09/04/2022, 11:40

Oral presentation

Vector-like quarks (VLQ) are predicted in many extensions to the
Standard Model (SM) as their vector-like nature allows them to extend
the SM while still being compatible with electroweak sector
measurements. Pair production of VLQ provides a model-independent
method of searching due to the QCD production of the particles. While
most searches have focused on VLQs that decay to an SM...