Seminar – Dr. Anindya Ghosh

Title: New Physics with ATLAS: Dark Matter, Di-Higgs, and the HL-LHC Future

Speaker : Dr. Anindya Ghosh, University of Arizona, U.S.A.

Time: 2:30pm

Venue: LH-3

Abstract:
Uncovering the particle nature of dark matter and exploring physics Beyond Standard Model (BSM) remain central goals of the LHC physics program. Collider searches provide sensitivity to a broad class of BSM scenarios, particularly those predicting final states with large missing transverse momentum and Higgs bosons. At the same time, the measured properties of the 125 GeV Higgs boson leave unresolved questions about the structure of the scalar sector and the stability of the electroweak scale. Di-Higgs production, especially via heavy resonances, offers a powerful probe of models such as two-Higgs-doublet extensions and Higgs-portal dark matter frameworks, motivating searches in high-pT regimes.
This talk presents recent ATLAS results targeting dark matter and BSM resonances decaying to Higgs boson pairs, focusing on the bbWW final state in boosted topologies. These analyses employ advanced jet reconstruction techniques and machine learning-based classifiers to enhance sensitivity in high-occupancy environments, setting important new constraints on theoretical models. Looking ahead to the High-Luminosity LHC (HL-LHC), ATLAS is undergoing significant upgrades, including a new all-silicon Inner Tracker and a completely redesigned trigger system. A key element is the introduction of Event Filter tracking, providing quality tracking to enable complex event selections. In parallel, a unified machine learning tagger is being developed to identify boosted Higgs, W-boson, and top candidates. These developments are essential to sustain and extend the experiment’s reach for rare BSM signatures in the HL-LHC era.