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Dr Marc-Olivier Bettler

Dr Marc-Olivier Bettler

University Lecturer, Department of Physics


Dr Bettler is a university lecturer in the High Energy group at the Cavendish. He received his PhD from the Swiss Federal Institute of Technology (EPF Lausanne) in 2010, and subsequently was awarded research Fellowships by the italian National Institute for Nuclear Physics (INFN), the Swiss National Science Foundation (SNF), the Marie Skłodowska-Curie Actions (European Commission) and the European Laboratory for Particle Physics (CERN). He is a member of the LHCb collaboration at CERN, and has held the scientific coordination positions of convener of the Rare Decays working group, Deputy Physics Coordinator and Physics Coordinator ad-interim.


Research Interests

Dr Bettler's research is carried out at CERN, in particular within the LHCb collaboration that exploits the LHCb detector. Dr Bettler's research aims at searching for physics beyond the Standard Model, coined New Physics. The LHCb detector is particularly suited for searching for New Physics using an indirect approach. Instead of directly looking for the decay of new particles, which would need to be materialised in the detector, the indirect approach rather looks for the effect of putative new particles on decays involving well known particles. This is possible as explained by Quantum Mechanics because new physics particle can remain virtual -- they do not need to materialise -- and still affect the underlying process.



  • High Energy Physics

Key Publications

Dr Bettler has authored more than 500 papers  published or accepted for publication in peer-reviewed international journals, as well as a number of public notes and other documents internal to the LHCb collaboration. A selection of the his most prominent scientific publications is listed below.

  • Prospects for Measurements with Strange Hadrons at LHCb, A.A. Alves et al., JHEP 05 048 (2019), arXiv:1808.03477.
  • Improved limit on the branching fraction of the rare decay K0→μμ, LHCb Collaboration, Eur. Phys. J. C 77 678 (2017), arXiv:1706.00758.
  • Flavour-changing neutral currents making and breaking the standard model, F. Archilli, M.-O. Bettler, P. Owen and K. A. Petridis, Nature 546 221 (2017). 
  • Measurement of the B0s →μμ- branching fraction and effective lifetime and search for B0 →μμ- decays, LHCb Collaboration, PRL 118 191801 (2017), arXiv:1703.05747.
  • Observation of the rare B0s →μμ- decay from the combined analysis of CMS and LHCb data, CMS and LHCb Collaborations, Nature 522 68 (2015), arXiv:1411.4413.
  • First evidence for the decay  B0s →μ+ μ-, LHCb Collaboration, PRL 110 021801 (2013), arXiv:1211.2674.
  • Strong Constraints on the Rare Decays  B0s →μ+ μ-  and  B0 →μ+ μ-, LHCb Collaboration, PRL 108 231801 (2012), arXiv:1203.4493.