Phd Position with The Cms Experiment

Remuneration Group 13 | Limited: 3 years | Starting date: earliest possible | ID: FHDO005/2025 | Deadline: 08.05.2025 | Full-time/Part-time

DESY, with more than 2900 employees at its two locations in Hamburg and Zeuthen, is one of the world's leading research centres. Its research focuses on decoding the structure and function of matter, from the smallest particles of the universe to the building blocks of life. In this way, DESY contributes to solving the major questions and urgent challenges facing science, society and industry. With its ultramodern research infrastructure, its interdisciplinary research platforms and its international networks, DESY offers a highly attractive working environment in the fields of science, technology and administration as well as for the education of highly qualified young scientists.

The CMS DESY group is one of the largest groups worldwide participating in the CMS Experiment at CERN. A major field of its scientific activity is the physics of the Higgs activity focuses in particular on final states with b quarks and tau leptons, investigating the production and decay properties of the discovered Higgs boson, as well as searching for additional bosons of an extended Higgs sector. The dataset being recorded in the ongoing Run 3 of the LHC opens unprecedented possibilities in the search for the production of Higgs boson pairs through decays of heavy resonances. The DESY CMS group is seeking to hire a PhD student to strengthen the team searching for such signatures in the final state with four b quarks. Besides physics analysis, the group is also involved in the construction of the Tracker and Calorimeter for the Phase-2 upgrade, luminosity measurements, the alignment of the Tracker and other calibration activities, as well as in shifts for the detector operation.

**About your role**:

- Analysis of CMS Run 3 data with focus on the search for Higgs boson pair production through decays of heavy resonances in final states with multiple b quarks
- Selection and training of suitable machine learning / AI algorithms, for event reconstruction and classification
- Interpretation in suitable theoretical models, including NMSSM and Warped Extra Dimensions
- Contributions to a future publication on this topic, as well as a potential future all-CMS combination
- Contribution to Tracker alignment, or another technical project
- Contributions to data-taking and production (shifts)
- Participation in schools and presentations at international workshops and conferences

**Good reasons to join**:
Look forward to a unique working environment on our international research campus. Respectful cooperation and the well-being of our DESY employees are particularly important to us. Gender equality is an important aspect for us. To support work life balance we offer flexible working hours, variable part-time, job-sharing models and participation in mobile work (up to 50%). You will benefit from our family-friendly and collegial atmosphere, our established health management and occupational pension provision. As a public funded employer, we offer you a secure workplace and facilitate your individual career with our comprehensive training and development opportunities. Remuneration is according to the regulations of the TV-AVH. DESY offers its employees a financial supplement for a German job ticket (Deutschland-Ticket) at both locations.

Limited: 3 years

**About you**:

- Master of science degree in physics with excellent grades
- Strong software skills (ROOT, C++, Python)
- Good teamwork and communication skills
- Good English language skills
- Ability and readiness to intermittently travel to CERN

You can find further information here:
Deutsches Elektronen-Synchrotron DESY
Personalabteilung
Notkestraße 85
22607 Hamburg
Phone: +49 40 8998-3392