ATLAS External Grants Sarah Heim (YIG)  · 

Searching for dark matter and other new physics with the Higgs boson at the ATLAS Experiment

Helmholtz Young Investigator Group of Sarah Heim (2016-2021)

Research Activities

The Young Investigator's Group is situated at DESY and is embedded in the ATLAS group there. It is also closely linked to the University of Hamburg. The group participates in the ATLAS experiment at the Large Hadron Collider (LHC) at CERN. We are focusing on searches for dark matter and other new physics using the Higgs boson, both direct searches for invisible decays of the Higgs boson and the measurement of Higgs boson properties in the Higgs -> ZZ -> 4l decay channel. We are also involved in the upgrade of the ATLAS Inner Tracker for the High-Luminosity LHC, through tests of mechanical properties of the detector components as well as detector module assembly and data acquisition.


Excellent candidates interested in Bachelor, Masters or PhD theses are welcome to contact me any time.

Higgs Studies

ATLAS strip upgrade

We are doing direct and indirect searches for new physics, in particular dark matter, using the Higgs boson. We also contribute to lepton and missing transverse momentum performance studies.

One of the new strip endcaps for the ATLAS detector will be assembled at DESY. We contribute to characterizations of the local support structure, module assembly and tests.

  • Electron identification and efficiency measurements
  • Muon reconstruction software
  • Missing transverse momentum performance studies, especially related to leptons and lepton-jet overlap removal
  • Search for Z bosons with large missing transverse energy: Z + dark matter (with and without Higgs boson as mediator)
  • Measurement of Higgs differential cross sections in the 4 lepton decay channel
  • Mechanical studies of strip endcap petals (bending, vibration tests)
  • Strip endcap module assembly
  • Module tests and data acquisition

Teaching

Semester

Title

University

July 2017

4 lectures about the Higgs boson

Summer school at the University of Hamburg: Particles, Strings and the Early Universe

Group Members (YIG and SFB 676 project B9)

 

Group Leader

Postdocs

PhD Students

Master Students

Bachelor Students

Current

Sarah Heim

William Leight

Fang-Ying Tsai
Namgyun Jeong

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Contact

Sarah Heim
Heim
Phone: +49 (0)40 8998 4863
E-Mail: Sarah Heim
Location: 1c / O2.305
DESY
Notkestr. 85, 22607 Hamburg, Germany

Publications

The ATLAS Collaboration, accepted by JHEP
"Measurement of inclusive and differential cross sections in the H→ ZZ*→4ℓ decay channel in pp collisions at √s = 13 TeV with the ATLAS detector"
Dataset: 36.1 fb-1

The ATLAS Collaboration, Eur. Phys. J. C (2017) 77
“Electron efficiency measurements with the ATLAS detector using 2012 LHC proton-proton collision data”
Dataset: ∼20.3 fb−1

 

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