Experimental Particle and Astro-Particle Physics Seminar

Stefanos Leontsinis (Universitaet Zuerich (CH))


Nine years ago, the discovery of a new fundamental particle, the Higgs boson (H), was announced by the ATLAS and CMS collaborations at CERN.  While elementary particles acquire their mass through their interaction with the Higgs field, the large differences in their masses as well as the origin of the three generations of fermions remain unexplained to this day and constitute the Standard Model flavour puzzle.

Measuring the coupling strength of each particle to the Higgs boson is among the most important tasks in modern particle physics. The next most promising candidate in the quark sector is the decay to a pair of charm quark and antiquark (cc).  

In my talk, I will focus on the analysis of Higgs bosons produced in association with a W or Z boson using data collected by the ATLAS experiment between 2015 and 2018. I will describe the analysis strategy employed to search for the H→cc signal. More precisely, I will present recent achievements in charm tagging algorithms that enable the identification of jets originating from c-quarks. To conclude, I will discuss the interpretation of this new result as a probe to the Standard Model flavour puzzle and its large constraining power on new physics scenarios. 

Zoom room link

Meeting ID: 912 1383 7955
Passcode: 069577

    • 2:00 PM 3:00 PM
      Charming Higgs bosons: direct constraint on the Higgs-charm coupling with the ATLAS detector 1h
      Speaker: Marko Stamenkovic (Nikhef National institute for subatomic physics (NL))