HEHS Students Attend UCL Particle Physics Masterclass

Article by Ruben U

On Wednesday 2nd April 2025, A Level Physics students from Hatch End High School visited University College London (UCL) for a full-day masterclass in particle physics. Accompanied by Dr Mehta and Mrs Dalal, the trip offered us an opportunity to delve into the world of quantum particles and the complex experiments carried out at CERN.

The day began with a fascinating lecture by Dr Martywood, a postdoctoral researcher working on the ATLAS experiment at CERN. He guided us through the historical development of particle physics—from the atomistic theories of Ancient Greece to modern discoveries such as the Higgs boson in 2012. Dr Martywood’s ability to simplify complex theories and his engaging presentation style helped make the content both accessible and stimulating.

We were then introduced to a data analysis session using real data collected from proton-proton collisions at the Large Hadron Collider. Using the ATLAS software, each pair of students was given a unique dataset. At first, interpreting the data was a challenge—navigating energy levels, decay patterns, and charge readings was like learning a new language. But with time and collaboration, we began to recognise patterns and classify particles, including electrons, muons, and even possible WW events.

My partner and I divided the dataset once we gained confidence, allowing us to work more efficiently. We analysed a total of 50 events and recorded our classifications, contributing to a combined dataset for the session. Our group calculated a positive-to-negative particle ratio of 1.49—strikingly close to the official CERN data ratio of 1.5. This suggested our methods were valid, even with a significantly smaller data sample.

Although we didn’t observe a Higgs boson event within our sample, we were shown how such discoveries are identified in much larger datasets at CERN. It was fascinating to see how experimental data is translated into physical insight at the forefront of science.

Later in the day, we joined a live video call with physicists working at CERN as well as student groups from institutions in other countries. I asked a question regarding how CERN deals with the uncertainty involved in filtering and interpreting such a vast quantity of data. Their response provided insight into the techniques used to maintain accuracy and manage statistical outliers. I also answered a question about what we had found most interesting, highlighting the massive scale of the data analysis undertaken and the technical precision required.

The masterclass was a challenging yet highly rewarding experience. Despite having only one introductory lesson on particle physics before attending, I came away with a much clearer understanding of both the theoretical and practical sides of the field. Although I now know that a career in particle physics might not be my preferred path, I’m extremely grateful for the opportunity to explore it.

I would strongly encourage other students to participate in similar masterclasses. The experience not only enhances subject knowledge but also provides an inspiring look into the work done at some of the world’s leading scientific institutions.

Article by Ruhi M

On the 2nd of April 2025, the year 12 Physics class were granted the opportunity to participate in a particle physics masterclass hosted by University College London (UCL).

With the help of Dr Ben Waugh and Dr Mark Fuller we were introduced to the basic concepts of particle physics, including the fundamental experimental idea of ‘colliding bigger rocks together to see what smaller rocks make up this matter.’ This was further explored in a lecture held by a UCL student who had worked on the ATLAS experiment. He shared his personal insight into the discovery of a particle that resembled characteristics of the Higgs Boson in 2012. He discussed the mechanics of the large Hadron Collider (LHC) and the possibility of expanding the collider further.

The event also consisted of hands-on experience with the CERN Hypatia program, with this we were taught to analyse and understand data sets and particle traces. By identifying the locations of energy signatures, it was possible to name the particle. These particles included: electrons, muons or positrons. With each particle recorded we were able to later share this data with all of the other students using the program all around the world.

We shared this data through a live video call hosted by two CERN physicists, who showed us how this data would be processed at CERN. They evaluated our readings and emphasised the importance of numbers. Although we had thought we had collected enough data between multiple countries (including Brazil, France, Argentina etc); for CERN to reach a valid conclusion of finding traces of the Higgs Boson they required more data.

We were then offered the opportunity to ask questions to the scientists, where we were able to gain knowledge about working on the collider, the future of CERN and the importance of particle physics.

Overall, the day was a wonderful experience and educational opportunity to further our physics knowledge and pique many of our interests for theoretical physics.