Category Archives: LHC

Colliding Colour

May I present ‘Colliding Colour’.

A little art project, inspired by particle physics collisions, that I have been fiddling around with for a while now. Here you can see “Collision #7”, one of the results of the current setup.

Just like in a collision in the ATLAS experiment at the Large Hadron Collider (LHC) at CERN, particles of colour collide at high energy and create a seemingly chaotic pattern in the detector. Admittedly, the energies are nowhere near those at the LHC and unlike in (real) high-energy collisions the outgoing ‘particles’ are still those that went into the collision, but yet there is a few commonalities. It is also coloured particles that collide in the LHC and the conservation of energy and momentum holds also in the Colliding Colours setup (even on a classical level).

If you want to see more, please have at my project page or directly on Instagram or Twitter.

You can find a making-of video for ‘Collision #8’ on YouTube.

15 years in ATLAS

Fifteen years ago, Tuesday 8 March 2005 at 9:57am, I received my CERN account, to start working for the ATLAS Experiment.

What started as an internship – chosen because of a lack of courses in the field I originally planned to pursuit, the physics of macromolecules – in the high-energy-physics group at the Niels Bohr Institute in Copenhagen, turned into a stay at CERN during the Summer Student Programme and a Master’s thesis about the electron identification with the ATLAS transition-radiation tracker (internal) together with studies on a precision measurement of the W-boson mass.

During my PhD at Deutsches Elektronen-Synchrotron DESY in Zeuthen and Humboldt-Universität zu Berlin and various short stays at CERN I was mainly working on the commissioning of the ATLAS pixel detector (internal) and data-driven algorithms to determine the W+Jets background in events with pair-produced top quarks, and was involved in the startup of the German National Analysis Facility.

Going back to the Niels Bohr Institute as a postdoc, I started working on searches for unconventional signatures and long-lived particles and got stuck with that ever since.

I started out looking for heavy, charged long-lived particles, an analysis I continued also after moving to LMU Munich in 2014.  Since then, I had the pleasure of leading two ATLAS physics subgroups – supersymmetry with R-parity-violating and long-lived signatures as well as exotics with unconventional and exotic Higgs decays – and joined a community effort in documenting the current status and harmonise searches for long-lived particles at the LHC. Amongst other things, I am currently also working on searches for Soft Unclustered Energy Patterns as signatures of strongly coupled Hidden Sectors and just finished my habilitation.

Besides physics analysis, especially looking for long-lived particles, I was always interested in science communication and education and have been involved in outreach projects since 2006. Highlights were and are certainly the design of the ATLAS LEGO model in 2011, the creation of the ‘Build Your Own Particle Detector‘ programme in 2013 and running it since, the coordination of the ATLAS contribution to the 2019 CERN Open Days, and the still ongoing work on a new ATLAS Visitor Centre. Since 2018, I am also an Education & Outreach coordinator for the ATLAS Collaboration.

I hope to have quite a few more years within ATLAS and other collaborations …


taken from
Conference picture taken from

This week, I had the pleasure of participating in the 7th edition of the Large Hadron Collider Physics Conference (LHCP) in Puebla, Mexico.

Besides talking about latest updates on “Searches for long-lived particles in ATLAS” and “Particle Physics Outreach as a Strategic Pillar for Society: A report from IPPOG”, as well as presenting posters on “Communicating ATLAS: adapting to an ever-changing media landscape” and “ATLAS Outreach: on the dissemination of High Energy Physics and Computer Sciences“, I also had the chance to see a – way too tiny – bit of Mexico during the week.

Unfortunately, due to the cancellation of my original flight to Mexico and the resulting late arrival, an extremely persistent jet lag waking we up at around 3am each day, and the fact that I already had to leave on Friday, there wasn’t really any time to explore much of Mexico. So I could only see a bit of Puebla’s city centre and – through the conference excursion – the archeological site of Teotihuacan.

Quite an intense week with lots of physics (see timetable), little sleep, lots of Mexican food and many people to meet. If only Mexico wasn’t a twelve-hour flight away …

Continue reading LHCP2019

Spring conferences

March is spring-conference time and ATLAS has presented some very nice results at the Moriond meeting in La Thuile over the past couple of days (and so have other experiments). Along with these results and the related publications we’ve been putting out several Physics Briefings highlighting some of the most interesting results and a summary piece.

In parallel, I’m at the spring meeting of the German Physical Society in Aachen this week. Our annual week with hundreds of talks and updates on particle physics in Germany and in general, this year enriched by talks on didactics and artificial intelligence.

On Tuesday I gave an invited-talk on “Searches for long-lived particles as signs of new physics at the LHC”, trying to convince a more people to join the hunt for long-lived particles ;)

Visiting ATLAS

With loads of data – collected during the past four years of Run 2 – in our pockets, ATLAS managed to produce a multitude of very interesting results and has now started Long Shutdown 2 (LS2), a two-year-long maintenance and upgrade phase to prepare ATLAS for the future. The latter includes both Run 3, coming up in 2021, and the high luminosity Large Hadron Collider (HL-LHC) scheduled for 2026. We’ll be covering all the upgrade activities on the ATLAS website over the coming months.

With the LHC turned off, LS2 will also be a great chance for anybody to visit ATLAS (starting from May this year). Last week I managed to renew my underground training and therefore had the chance to see our beauty myself (see pictures) after quite some time.
Besides the visits there is also lot’s of other things happening this year … CERN Open Days, a new ATLAS Visitor Centre, lots of new results … just to name a few.