Arbeitsgruppen
Elina Fuchs

Arbeitsgruppe Fuchs

In meiner Arbeitsgruppe geht es um Erweiterungen des Standardmodells der Teilchenphysik und deren Phänomenologie am Large Hadron Collider (LHC), zukünftigen Beschleunigern und an der Schnittstelle zur Atomphysik.

Wir gehen den Eigenschaften des Higgs Bosons, Kandidaten für Dunkle Materie und der Baryonasymmetrie des Universums auf den Grund. Dafür entwickeln wir innovative Methoden um Theorievorhersagen im Vergleich zu experimentellen Daten zu testen und um neue sensitive Messungen vorzuschlagen.

In my group, we work on extensions of the Standard Model of particle physics and their phenomenology at the Large Hadron Collider (LHC), future colliders and at the interface to atomic physics.

We investigate the properties of the Higgs boson, candidates for Dark Matter and the baryon asymmetry of the Universe. To do so, we develop innovative methods to confront theory predictions with experimental data and to suggest new sensitive measurements.

As part of the Excellence Cluster QuantumFrontiers, we have close connections to experimental and theoretical atomic physics groups at LUH and PTB, and furthermore to the German and international high-energy community. More information about the junior professorship can be found in this QuantumFrontiers announcement and on p. 121 of the booklet of the department for Mathematics and Physics (Fakultätshandbuch).

Research group: Particle physics beyond the Standard Model

Jun.-Prof. Dr. Elina Fuchs
Junior-Professorinnen und Junior-Professoren
Adresse
Appelstraße 2
30167 Hannover
Gebäude
Raum
Jun.-Prof. Dr. Elina Fuchs
Junior-Professorinnen und Junior-Professoren
Adresse
Appelstraße 2
30167 Hannover
Gebäude
Raum

Team

POSTDOCS

Dr. Fiona Kirk (at PTB/CERN, since 01/10/2022)

PhD students

M.Sc. Agnese Mariotti
Doktorandinnen und Doktoranden
M. Sc. Marco Menen
Doktorandinnen und Doktoranden

M. Sc. Jan Richter (at PTB Braunschweig), jan.richter@ptb.de

Master students

B. Sc. Finn Feuerstake

B. Sc. Althea Cappelli (jointly supervised with Prof. Dr. Tobias Osborne)

Bachelor students

Marc Hannig (from 10/2022)

Join us

Motivated and talented students, PhD students and postdocs are very welcome to join me and my new group in the quest for particles and phenomena beyond the Standard Model. Please contact me if you are interested in a Bachelor, Master, PhD thesis, a postdoc or a research visit in my group.

My junior professorship started in June 2021 and I am now building a dynamic research team. Until July 2023, I will be based at CERN (on leave of absence from LUH and PTB), and PhD students and postdocs from my team can also come to CERN for a research visit before the group will be centered in Hannover/Braunschweig from summer 2023 on.

Three PhD students and a postdoc started this year. Currently, no further PhD or postdoc positions are available, but it is possible to apply for externally funded fellowships. Bachelor and master students are welcome to join at any time, however, until summer 2023 the supervision would be remote apart from occasional in-person meetings in Hannover. No additional M.Sc. theses are available during the current winter semester 22/23.

As an alumna of the Studienstiftung des deutschen Volkes, the Minerva Foundation and the Humboldt Foundation, I will be happy to support fellowship applications of qualified candidates for these or other fellowships, e.g.

I explicitly welcome applications from students and scientists of all nationalities, genders and cultural backgrounds.

News

  • 21.09. - 05.12.2022: This fall also included exciting outreach events. It was a big honor for me to give the final lecture in the series "7 adventures" on the 7 millenium problems of mathematics. My lecture on the physics view on "Young Mills theories: existence and mass gap" was hosted by the Junge Akademie and took place in the Berlin-Brandenburg Academy of the Sciences and Humanities - what a nice location! For the new CERN exhibition "Science Gateway", I was filmed to explain concepts like the vacuum and black holes in German. Another filming will be about "Exploring the Unknown". More details are available in the Outreach section below.
  • 1.-4.11.2022: The CERN Quantum Technology Initiative moved a big step forward with our International Conference on Quantum Technologies for High-Energy Physics (QT4HEP) in CERN's main auditorium which attracted 250 participants from leading institutes of particle physics, quantum computing and quantum sensing, as well as from industry. Several participants from LUH and PTB also gave a talk. 
  • 1.11.2022: wonderful to welcome Fiona and Agnese to CERN and have at least a part of the group around for in-person interactions! Agnese will stay for the fall and Fiona until next summer before the whole group will be located in Hannover and Braunschweig.
  • 26.09. - 29.11.2022: The fall was full of trips to interactive workshops. In September, I gave a talk at the Trapped Charged Particles (TCP2022) Conference in Glashütten, and participated as a member of the organizing committee in the DESY Theory Workshop focused on "Higgs, Flavor and Beyond". In October, it was great to see many experts of quantum sensing from around the world in Hannover at the conference on ”Quantum sensors and tests of new physics” (QSNP). Fiona and Jan presented posters there and I gave a talk. In November, I gave talks at the ”Quantum Systems in Extreme Conditions“ (QSEC2022) conference in Bingen, the CERN Theory retreat in Les Houches, and at the LHC Higgs Working Group workshop at CERN. At the simultaneous Helmholtz Alliance Workshop "Physics at the Terascale", Marco presented our first results of a Machine Learning-based approach to enhance the sensitivity of the LHC to the CP structure in the effective Higgs-gluon coupling.
  • 10.10.2022: With the start of the fall semester, also my Quantum Field Theory lecture started. So many students participate such that we had to bring in more chairs into the lecture room. 
  • Oct 2022: The Leibniz University Hannover nominated me for the Heinz Maier-Leibnitz Award for outstanding young scientists with an independent research profile who are on a fixed-term position. Thank you very much for the nomination! Now I hope to pass the selection process by the DFG.
  • 15.09.2022: Althea Cappelli will work on a master thesis on particle physics and quantum information theory jointly supervised by Prof. Tobias Osborne and me, starting in the winter term. Welcome in the group!
  • 16.08.2022 Finn Feuerstake and Marc Hannig are joining our group for their master and bachelor theses, respectively, starting in the winter semester. Welcome to the team!
  • 8.-12.8.2022: It was a a huge pleasure to welcome 20 students from LUH and 2 external participants to CERN for a lively week of a compact block lecture on Particle Physics Beyond the Standard Model - including lectures, exercises, a guided tour and a hands-on workshop where we built our own cloud chambers!
  • In August 2022, I was appointed as the Theory Coordinator of the CERN Quantum Technology Initiative (QTI) to strengthen the collaboration in quantum sensing, computing and theory  between CERN as a European hub and institutes in its member states (including Germany and therefore the LUH & PTB), and to initiate new scientific collaborations. I look forward to the intense exchange of ideas and contributing to this European network. This new task extends my stay at CERN such that I will move to Hannover in the summer of 2023.
  • 12.07.2022: It was a pleasure to join the lunch meeting organized by the LUH Graduate Academy on combining working in academia and having a family, to share my own experiences and hear from others.
  • 15.-17.06.2022: Wonderful to meet the Higgs & EFT community in person at the HEFT2022 conference in Granada, Spain. I gave a talk on electroweak baryogenesis in SMEFT. It was my first flight after over a year and will remain my only flight this year. Apart from that, I travel by train, also long distances, and work in the train.
  • 09.-13.05.2022: It was exciting to attend the Heraeus Seminar at Bad Honnef on High-precision measurements and searches for New Physics where Jan presented a poster and I gave a talk. How nice to meet the community in person after a long time of online meetings.
  • 24.03.2022 Marco presented our work at the DPG spring meeting of particle physics.
  • 17.03.2022: Jan presented his paper on parity violation with partially stripped ions at the DPG spring meeting of atomic physics.
  • 16.03.2022: I was glad to join for the first time the DPG spring meeting (even if online) of the atomic section by giving an invited talk on Searching for physics beyond the Standard Model with isotope shift spectroscopy.
  • 15.03.2022: Agnese Mariotti had her first day of work as a PhD student at LUH. Benvenuta! She graduated from Università Roma Tre with a master thesis on the Dark Matter relic density in gravitational portal scenarios. Her PhD position is funded by a generous donation from the ITP alumnus Dr. Marco Krohn to the LUH-ITP. Agnese won this position through the ITP-wide selection procedure. Congratulations!
  • 25.02.2022: Marco's and my paper in collaboration with colleagues from DESY, UChicago, Madrid and Paris appeared on the arXiv: Constraining the CP structure of Higgs-fermion couplings
    with a global LHC fit, the electron EDM and baryogenesis
  • 02.02.2022: On his second day of work, Jan's paper on Parity-Violation Studies with Partially Stripped Ions got published. Congratulations!
  • 01.02.2022: Jan Richter and Marco Menen had their first working day as PhD students at the FPM (Institut für Fundamentale Physik für Metrologie) at PTB. Congratulations and welcome to the team! Jan graduated from TU Braunschweig with a master thesis at PTB on parity violation in hydrogen-like ions. Marco graduated from Uni Köln with a master thesis at Uni Bonn on the CP structure of the Higgs-fermion couplings.
  • 20.01.2022: Few days before the actual start of his contract, Marco presented our work on CP violation in Yukawa couplings in the LHC Higgs cross section CP working group meeting.
  • 06.01.2022: Fiona Kirk, currently PhD student at PSI/Zurich, accepted a postdoc position in our group. Looking forward to welcoming you in the fall!
  • 23.11.2022: At the 14th Annual Meeting of the Helmholtz Alliance “Physics at the Terascale”, I gave a talk on constraining CP violation in the Higgs Yukawa couplings.

Publikationen

CV

since 06/2021Junior Professor at the Leibniz University of Hannover and PTB Braunschweig
in the Excellence Cluster QuantumFrontiers; member of the Science Board
leader of the Topical Group "Testing Fundamental Physics with Spectroscopy"
since 07/2022: member in the SFB DQmat

since 06/2021

Senior Research Fellow at CERN, Switzerland
from 08/2022: Theory coordinator of the CERN Quantum Technology Initiative
2019 - 2021Postdoc at Fermilab and the University of Chicago, USA; Feodor-Lynen Fellow
2015 - 2019Postdoc at the Weizmann Institute of Science, Israel; Minerva Fellow
2012 - 2015PhD (Dr. rer. nat.) at DESY/ University of Hamburg
2014: 4-months research stay at CERN
2006 - 2012B.Sc. and M.Sc. at Georg-August University of Göttingen, M.Sc. thesis at DESY, Hamburg
2011: 1-month research stay at University of California, Santa Cruz, USA
2009/2010: Erasmus at University of Helsinki, Finland

Research Topics

  • Higgs phenomenology beyond the Standard Model
    • CP violation in the Higgs sector
      • collider constraints on complex Higgs Yukawa couplings
      • Machine Learning to enhance the sensitivity to a small CP admixture in the discovered Higgs boson
      • electroweak baryogenesis
      • electric dipole moments
    • SM extended by a light (pseudo-)scalar
      • searches for a light (pseudo-)scalar at the energy, intensity and precision frontiers
      • relaxion-Higgs mixing
      • naturalness
      • exotic Higgs decays
      • long-lived particles
    • quasi-degenerate (pseudo-)scalars
      • mixing and resonance effects
      • interference effects
      • development of precise approximations
      • LHC bounds on heavy Higgs bosons
    • sensitivity to BSM Higgs sectors at future colliders
  • precision spectroscopy as a tool to search for new light particles
    • isotope shifts to reduce nuclear uncertainties
      • nonlinearity of King plots for heavy elements
      • few-electron systems
    • Rydberg states
    • Highly charged ions
    • plans: molecules, exotic atoms
    • interpretation in models that are best tested by spectroscopy
    • Dark Matter and mediators to Dark Sectors
  • high-frequency gravitational waves
    • searches with atomic clocks
Jun.-Prof. Dr. Elina Fuchs
Junior-Professorinnen und Junior-Professoren
Adresse
Appelstraße 2
30167 Hannover
Gebäude
Raum
Jun.-Prof. Dr. Elina Fuchs
Junior-Professorinnen und Junior-Professoren
Adresse
Appelstraße 2
30167 Hannover
Gebäude
Raum

Lectures

  • Winter semester 2022/23: Quantum Field Theory

    5 ECTS, 3 (L) + 1 (Ü) SWS with exercises, Monday 14-16 L, Friday 12-13 L, 13-14 Ü

    Quantum Field Theory

    The lecture will be hybrid: some lectures will take place in person at LUH. The remaining lectures will be online in the weeks when I am at CERN.
    The online lectures are recorded and available on StudIP/Flowcasts.

    The lecture will be held in English. The homework and the exam will be accepted in German and in English.

    The exam dates are

    08.02.23, Großer Physikhörsaal (E214), 12:00-15:00 Uhr
    04.04.23, Großer Physikhörsaal (E214), 13:00-16:00 Uhr

    More information on StudIP.

  • Summer semester 2022: Particle physics beyond the Standard Model (block lecture at CERN)

    2 ECTS, 1 week lecture at CERN + 3 online exercise sessions

    Why is the Standard Model of particle physics (SM) incomplete? Why is the Higgs mass much below the Planck scale? What could Dark Matter be? Where does the baryon asymmetry come from? After a review of the SM with a focus on its gauge groups and the Higgs mechanism of electroweak symmetry breaking, this lecture covers several extensions of the SM that address (some of) its shortcomings. In addition to the theoretical concepts, we also touch upon the detection strategies.

    17 BSc/MSc students and 4 PhD students travelled to CERN in Geneva to attend this compact block lecture from 08 to 12/08. In addition to 21 teaching hours in presence including a daily exercise session, 3 online sessions take place after the excursion to address questions and discuss the solutions of the  homework assignments.

    During the week at CERN, a guided tour to the synchrocyclotron and the ATLAS control room, a hands-on workshop to build our own cloud chambers to detect traces of particles, visits to the on-site exhibitions Microcosm and World of Particles, and lunch discussions completed the program with practical experiences.

    The excursion was generously supported by the with 6651€ from the study quality funds (SQM) of the ITP which fully funded the train tickets and 5 nights in the CERN hostel for the 17 BSc and MSc students.

    Detailed information can be found on Indico and StudIP.

Outreach

Introduction to my lecture. Photo by Christof Rieken.
Speakers, organizers and the moderator of the podium discussion. Photo by Christof Rieken.
Podium discussion. Photo by Christof Rieken.

This section is under construction. More details about my outreach activities will follow.

Reaching an audience beyond my field and sparking the general public's interest in topics I am passionate about is always very rewarding for me. I also enjoy the often surprising and very fundamental questions by a general audience.

  • On 18/11, I had the immense pleasure to give a public evening lecture in the Berlin-Brandenburgische Akademie der Wissenschaften. My closing lecture on "Young Mills Theories: Existence and Mass Gap" took place in the outreach series "7 adventures" on the 7 millenium problems of mathematics under the patronage of the Federal Minister of Education and Research. Many thanks to the mathematicians Prof. Timo de Wolff and Prof. Sebastian Stiller and the Junge Akademie for inviting me to present a physicist's view on this mathematically unsolved problem with physics evidence. In the subsequent podium discussion with the speakers of the previous talks on the other millenium problems, moderated by Prof. Günter Ziegler (mathematician and president of the Freie Universität Berlin), we discussed the status, perspective and relevance of the 7 millenium problems (of which only one has been solved so far). Find out more on 7abenteuer.diejungeakademie.de.
  • On 21/09, I had the honor to be filmed by the CERN communication & exhibitions team for the German version of explanations about Black Holes, the vacuum and tunneling effects. The result will be shown in the Science Gateway exhibition (https://sciencegateway.cern/) as "quantum animated stories" with video clips of theorists in the theory common room and -as an animation- in outer space. It was a great pleasure to spend a fraction of the working day in the CERN studio. Thanks a lot to Emma Sanders and Alexandre Cavin for the professional preparation and filming. © Photos by Emma Sanders.
  • Besides these 2 examples, I have been regularly involved in outreach activities, from coordinating physics shows to guiding tours of visitors at DESY into the HERA tunnel and to synchrotron facilities, chatting with high-school students (over dinner, in and auditorium or online), giving public talks and serving in panel discussions.