Humboldt-Universität zu Berlin - Mathematisch-Naturwissen­schaft­liche Fakultät - Experimentelle Elementarteilchenphysik

Dr. Hannsjörg Weber Senior scientist   Experimental High Energy Group Institut für Physik Humboldt-Universität zu Berlin   Office 2’418 Newtonstr. 15 12489 Berlin +49 30 2093-82251 hannsjoerg.weber (@) physik.hu-berlin.de

Note for students:

Please find our list of potential thesis topics and see our posters on ATLAS and DECAL. If you are interested to perform your thesis on the DECAL project, please contact Prof. Issever or Prof. Worm. For studies with ATLAS, contact Prof. Issever or Dr. Leitgeb.

If you are interested in internships (either as high school or university/college student) within our group, please contact Dr. Leitgeb or Dr. Schwanke.

Research Areas

Member of the ATLAS experiment (since 2021)

• Measurement of Higgs self-coupling with di-Higgs final states
• Energy and mass calibration of jets and heavy-flavor jets

Member of the DECAL collaboration (since 2021)

• Testing monolithic silicon sensors for their usage in calorimetry
• Developing research plan towards a new sensor design and calorimeter prototype
  

Previous research

Member of the CMS experiment (2011 - 2021)

• Observation of the standard model triple-electroweak boson production (VVV, V = W and/or Z)
• Searches for supersymmetric partner particles of top-quarks, quarks and gluons
• Construction of the high luminosity-LHC upgrade of the CMS outer tracker
• Construction and commissioning of the phase-1 forward pixel detector
• Study of the electromagnetic calorimeter laser monitoring data

Coordination roles

Since 2023:    Co-Coordinator of task force to develop dedicated calibration of b-quark jets for the ATLAS collaboration

2022 - 2024:  Co-convener of the group for developing jet definitions and simulation-based calibrations of jets for the ATLAS collaboration

2018 - 2020:  Chair of the Physics Forum committee (seminar series at Fermilab)

2019:             Chair of the Multibosons at the Energy Frontier workshop

2017 - 2019:  Co-convener of the group for supersymmetry searches focused on the production of third generation fermion superpartners for the CMS collaboration

2016 - 2017:  Member of the event committee at the LHC physics center at Fermilab

Teaching

This semester, I’m teaching the Pk7 and M5 modules “Nuclear and particle physics” (teacher’s track).

Previous lectures and tutorials:

• Lecture: Pk7 and M5 modules “Nuclear and particle physics” (teacher’s track), 2022
• Tutorials: P1.2 module “Physics 2: electromagnetism”, 2021 - 2023

Education and professional career

2021 - 2024:   Tenure-track senior scientist at Humboldt-Universität zu Berlin

2015 - 2021:   Postdoctoral Research Associate at the Fermi National Accelerator Laboratory (Fermilab)

2011 - 2015:   Scientific Assistant, ETH Zürich

2015:              PhD, ETH Zürich

2011:              MSc, ETH Zürich

2009:              BSc, ETH Zürich

Selected Publications

• L. Fasselt et al., “Energy calibration through X-ray absorption of the DECAL sensor, a monolithic active pixel sensor prototype for digital electromagnetic calorimetry and tracking”, Front. Phys. 11 (2023) 1231336
• C. Accettura et al., “Towards a Muon Collider”, Eur Phys. J. C 83 (2023) 86,  arXiv:2303.08533
• P. Allport et al., “DECAL: A Reconfigurable Monolithic Active Pixel Sensor for Tracking and Calorimetry in a 180 nm Image Sensor Process”, Sensors 22 (2022) 6848
• The Tracker Group of the CMS Collaboration “The CMS Phase-1 Pixel Detector Upgrade”, JINST 16 (2021) P02027,  arXiv:2012.14304
  
• The CMS Collaboration, “Observation of the production of three massive gauge bosons at √s = 13 TeV”, Phys. Rev. Lett. 125 (2020) 151802,  arXiv:2006.11191
• The CMS Collaboration, “Search for the production of W^±W^±W^∓ events at √s = 13 TeV”, Phys. Rev. D 100 (2019) 012004,  arXiv:1905.04246
  
• The CMS Collaboration, “Search for direct top squark pair production in events with one lepton, jets and missing transverse energy at 13 TeV with the CMS experiment”, JHEP 05 (2020) 032,  arXiv:1912.08887
  
• The CMS Collaboration, “Search for top squark pair production in pp collisions at √s = 13 TeV using single lepton events”, JHEP 10 (2017) 019,  arXiv:1706.04402
  
• The CMS Collaboration, “Searches for supersymmetry using the M_T2 variable in hadronic events produced in pp collisions at 8 TeV”, JHEP 05 (2015) 078,  arXiv:1502.04358
  
• The CMS Collaboration, “Search for supersymmetry in hadronic final states using M_T2 in pp collisions at √s = 7 TeV”, JHEP 08 (2012) 018,  arXiv:1207.1798
  

A list of publication can be also found here.