II. Physikalisches Institut

Prof. Dr. Stan Lai

Research Interests

My research interests involve a deeper understanding of electroweak symmetry breaking and the Higgs boson (discovered at the LHC in 2012). I'm a member of the ATLAS experiment at the LHC based at CERN (in Geneva, Switzerland), where proton-proton collisions at energies of 13/14 TeV are investigated. These collision energies, the highest ever achieved at a collider, allow us to produce heavy fundamental particles such as the Higgs boson, and study phenomena at extremely high energy scales where electroweak symmetry breaking plays an important role.

I am focused on understanding the properties of the Higgs boson, such as its quantum numbers, its couplings to other particles, and its behaviour in more detail through precision measurements with the ATLAS detector. This will enable a better understanding of the physics of electroweak symmetry breaking. I am also interested in searches for new phenomena beyond the Standard Model of particle physics that could appear at TeV energy scales.

Research Group

Academics and Post-doctoral Fellows
Dr. Michel Janus (Akademischer Rat)
Dr. Jason Veatch (wissenschaftlicher Angestellter)

Ph.D. Students
Timo Dreyer
Petar Bokan (jointly supervised with Uppsala University)
Serhat Ördek
Lino Gerlach
Kira Abeling

Master's Students
Kieran Amos
Joshua Beirer

Former Members
Tobias Fitschen (M.Sc. 2018)
Nils Gillwald (M.Sc. 2018)
Charlotte Kappler (B.Sc. 2018)
Arthur Linß (M.Sc. 2018)
Kai Henßen (M.Sc. 2017)
Kieran Amos (B.Sc. 2016)
Alejandra Pillado Gonzalez (B.Sc. 2016)
Julian Wollrath (M.Sc. 2016)

Selected Publications

The ATLAS Collaboration, "Search for Resonant and Nonresonant Higgs Boson Pair Production in the bbτ+τ- Decay Channel in pp Collisions at sqrt(s) = 13 TeV with the ATLAS Detector", Phys. Rev. Lett. 121, 191801 (2018).

The ATLAS Collaboration, "Test of CP invariance in vector-boson fusion production of the Higgs boson using the Optimal Observable method in the ditau decay channel with the ATLAS detector", EPJC (2016) 76:658.

The ATLAS Collaboration, "Identification and energy calibration of hadronically decaying tau leptons with the ATLAS experiment in pp collisions at √s=8 TeV", EPJC (2015) 75:303.

The ATLAS Collaboration, "Evidence for the Higgs-boson Yukawa coupling to tau leptons with the ATLAS detector", JHEP 04 (2015) 117.

The ATLAS Collaboration, "Search for charged Higgs bosons decaying via H+→τ+ν in fully hadronic final states using pp collision data at √s=8 TeV with
the ATLAS detector ", JHEP 03 (2015) 088.

The ATLAS Collaboration, "Search for the neutral Higgs bosons of the Minimal Supersymmetric Standard Model in pp collisions at √s=7 TeV with the ATLAS detector", JHEP 02 (2013) 095 .

The ATLAS Collaboration, "Measurement of the Z→ττ cross section with the ATLAS detector", Phys. Rev. D 84, 112006 (2011).

Work History and Education

Akademischer Rat, Albert-Ludwigs-Universität Freiburg, (2011-2015)

Postdoctoral Research Associate, Albert-Ludwigs-Universität Freiburg, (2006-2011)

Ph.D. in Physics, University of Toronto, (March 2007)

M.Sc. in Physics, University of Toronto, (November 2001)

B.A.Sc. in Engineering Science, University of Toronto, (June 1999)