ATLAS is one of the four major experiments at the Large Hadron Collider (LHC) at CERN. It is a general-purpose particle physics experiment run by an international collaboration and, together with CMS, is designed to exploit the full discovery potential and the huge range of physics opportunities that the LHC provides.

ATLAS' scientific exploration uses precision measurement to push the frontiers of knowledge by seeking answers to fundamental questions such as: What are the basic building blocks of matter? What are the fundamental forces of nature? Could there be a greater underlying symmetry to our universe?

atlas detector

Professor Mallik and her group joined the ATLAS experiment with SLAC at the end of 2006. She and her group were involved in the Silicon Pixel detector (PIX), with a big part of the group residents at CERN. They were responsible for the calibration of the PIX (in DSP), fully involved in the commissioning of the project and cosmic ray data taking and analysis, as well as prepare the databases. They then participated in the liquid Argon Calorimeter (LAr), in Phase 1 trigger upgrade and LAr operation leadership. The group had a central role in the High Granularity Timing Detector (HGTD), as part of the LAr system for the Hi-Lumi upgrade when the luminosity is expected to be 0.75´1035 cm-2 s-1, and typical pile-up will reach 140, with a maximum of 200. The HGTD is a state-of-the-art Si detector with ~30 psec timing resolution. This will add an extra dimension in discrimination with the high pile-up rate and thus make effective use of the high event rate.

sim event LoI ITk layout
Now they have gotten involved in the ITk Si-dtrips detector: in the production and test of them at BNL and at CERN.
The group's physics interests lie in understanding the Higgs boson properties. They spearheaded the Higgs decay into a b-quark pair, in order to test the Yukawa coupling (Higgs coupling to fermions).
Their goal is to establish what physics lies beyond the Standard Model (BSM): namely, what bigger symmetry includes the SM as a subset of it. They have now established (5s) the H --> b-bbar decay in  V+H (V=W/Z) production.

 Taking advantage the increased Run2 energy of LHC (13 TeV), they searched for any VH resonance and set limits according to the 2HDM and HVT models. 
They are also involved in Dark Matter and possible Dark Energy search, and Precision measurement of the Weak mixing angle.



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