• External Grants
• Lydia Beresford (YIG)
• Katharina Behr (YIG)
• Sarah Heim (YIG)
• Priscilla Pani (YIG)
• Kerstin Tackmann (ERC)

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 Search for Higgs decays to 2 photons, one of which has an internal conversion to two leptons (yy*)	Mechanical studies of strip endcap petals (bending, vibration tests) Strip endcap module assembly Module tests and data acquisition

Teaching

Group Members funded through the YIG (The group has more members! Just funded through different sources.)

Contact

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

Publications

Sonia Carra, Vincent Goumarre, Ruchi Gupta, Sarah Heim, Beate Heinemann, Jan Kuechler, Federico Meloni, Yee-Chinn Yap, arXiv:2106.10085 (submitted to PRL)
Constraining off-shell production of axion-like particles with Zγ and WW differential cross-section measurements
Reinterpretation study

Jorge Sabater Iglesias, Vincent Goumarre, Fang-Ying Tsai, Mangesh Sonawane, Sarah Heim, Beate Heinemann, arXiv:2106.01268 (submitted to JHEP)
Estimating ZZ production with Zγ events at the LHC: cross-section ratio and uncertainties
Phenomenological study

The ATLAS Collaboration, arXiv:2103.10322 (accepted by PLB)
"Evidence for Higgs boson decays to a low-mass dilepton system and a photon in pp collisions at √s= 13 TeV with the ATLAS detector"
Dataset: 139 fb-1 (13 TeV)

The ATLAS Collaboration, Eur. Phys. J. C 81 (2021) 332
"Search for heavy resonances decaying into a pair of Z bosons in the ℓ+ℓ−ℓ+′ℓ′- and ℓ+ℓ-νν final states using 139 fb−1 of proton-proton collisions at √s=13 TeV with the ATLAS detector"
Dataset: 139 fb-1 (13 TeV)

The ATLAS Collaboration, Eur. Phys. J. C 80 (2020) 942
"Measurements of the Higgs boson inclusive and differential fiducial cross sections in the 4ℓ decay channel at √s = 13 TeV"
Dataset: 139 fb-1 (13 TeV)

The ATLAS Collaboration, Eur. Phys. J. C 79 (2019) 639
"Electron reconstruction and identification in the ATLAS experiment using the 2015 and 2016 LHC proton-proton collision data at √s = 13 TeV"
Dataset: 36 fb-1 (13 TeV)

The ATLAS Collaboration, Phys. Lett. B 786 (2018) 114
"Combined measurement of differential and total cross sections in the H→γγ and the H→ZZ∗→4ℓ decay channels at √s=13 TeV with the ATLAS detector"
Dataset: 36.1 fb-1 (13 TeV)

The ATLAS Collaboration, Phys. Lett. B 784 (2018) 173
"Observation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector"
Dataset: 36.1 - 79.8 fb-1 (13 TeV)

The ATLAS Collaboration, JHEP 10 (2017) 132
"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 (13 TeV)

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 (13 TeV)

Conference notes

The ATLAS Collaboration, for Higgs 2020, ATLAS-CONF-2020-053
"Interpretations of the combined measurement of Higgs boson production and decay"
Dataset: 25-139 fb-1 (13 TeV)

The ATLAS Collaboration, for ICHEP 2020, ATLAS-CONF-2020-027
"A combination of measurements of Higgs boson production and decay using up to 139 fb−1 of proton–proton collision data at √s = 13 TeV collected with the ATLAS experiment"
Dataset: 25-139 fb-1 (13 TeV)

The ATLAS Collaboration, for LHCP 2020, ATLAS-CONF-2020-005
"Measurement of the Higgs boson mass in the H→ZZ∗→4ℓ decay channel with √s=13 TeV pp collisions using the ATLAS detector at the LHC"
Dataset: 139 fb-1 (13 TeV)

The ATLAS Collaboration, for EPSHEP 2019, ATLAS-CONF-2019-032
"Combined measurement of the total and differential cross sections in the H→γγ and the H→ZZ∗→4ℓ decay channels at √s=13 TeV with the ATLAS detector"
Dataset: 139 fb-1 (13 TeV)

The ATLAS Collaboration, for EPSHEP 2019, ATLAS-CONF-2019-025
"Measurements of the Higgs boson inclusive, differential and production cross sections in the 4ℓ decay channel at √s = 13 TeV with the ATLAS detector"
Dataset: 139 fb-1 (13 TeV)

The ATLAS Collaboration, for LHCP 2018, ATLAS-CONF-2018-018
"Measurements of the Higgs boson production, fiducial and differential cross sections in the 4l decay channel at √s = 13 TeV with the ATLAS detector"
Dataset: 80 fb-1 (13 TeV)