FH Particle Physics Pizza seminar: Exclusive radiative decays of Higgs, W/Z with ATLAS

Monday 25 Mar 2024, 11:30 → 13:00 Europe/Berlin

SR 4 (DESY Hamburg)

Aaron Dean Spector (DESY), Claudia Seitz (DESY), Juergen Reuter (DESY)

The goal of the FH Particle Physics Pizza seminar is to foster discussion and exchange between the various FH physics groups at DESY. Specifically, we are trying to enhance the exchange between the experimental and theory community, with in-depth talks about a specific topic in a more informal setting. 
 

We will order pizza (vegetarian and meat options with cheese) to eat for lunch. In order to have a better estimate of how many people come, please click on the "Register" link below. 

 

Please register if you want to eat pizza, we will collect 7 Euros from every participant who registers. If you have any specific food requirements (vegan, gluten free, etc.) please let us know in advance and we will see what we can do. If a reference paper exists, we will link it from the page and encourage you to read it before the seminar. 

 

If you do not want pizza, you do not need to register, just join us in the seminar.

 

ZOOM connection

https://desy.zoom.us/j/62825129183?pwd=NDRuQTZBeFNKeWVnMzBzNkJIMm9IUT09
Meeting ID: 628 2512 9183
Passcode:  629967

11:30 → 12:10 FH Particle Physics Pizza seminar: Exclusive radiative decays of Higgs, W/Z with ATLAS

In the Standard Model (SM) the mass generation of fermions is implemented through Yukawa couplings to the Higgs boson. Experimental evidence exists for the Higgs boson couplings to second and third generation leptons through its decay to muon and tau pairs, but for quarks direct evidence exists only for the third-generation couplings. Direct searches for inclusive decays of the Higgs boson to lighter quarks are challenging due to large QCD backgrounds at the LHC.
With their distinct experimental signature, radiative decays of the Higgs boson to a meson and a photon may offer an alternative probe of quark Yukawa couplings. Moreover, these decays provide an opportunity to investigate physics beyond-the-SM, where significantly modified branching fractions from the SM expectation are predicted, as well as the existence of potential quark-flavour-violating couplings of the Higgs boson. This talk will summarise searches for rare exclusive Higgs boson decays to a meson and a photon performed by the ATLAS experiment using the √𝑠 = 13 TeV dataset, along with searches for related decays of the W and Z bosons. These searches use dedicated triggers which were in operation throughout Run 2 of the LHC, as well as novel non-parametric data-driven techniques to model the backgrounds.

Speaker: Robert James Ward (UNI/EXP (Uni Hamburg, Institut fur Experimentalphysik))

MesonGamma_RW_Seminar_v5.pdf

12:30 → 13:00 Pizza