Measurements of SM couplings and constraints on BSM modifications in Higgs boson decays to bottom quarks

Experimental Particle Physics seminar

Measurements of SM couplings and constraints on BSM modifications in Higgs boson decays to bottom quarks

  • Event time: 4:00pm until 5:00pm
  • Event date: 29th October 2021
  • Speaker: Dr Elisabeth Schopf (Oxford University)
  • Location: Higgs Centre Seminar Room, Room 4305,

Event details

Decays of Higgs bosons to pairs of bottom quarks are expected to account for more than half of all Higgs boson decays. Therefore their study is essential for the understanding of the Yukawa coupling and the mass generation of fermions. In addition, the abundance of these decays allows to probe rare kinematic regimes of Higgs boson productions, such as large transverse momenta. Our tool to study Higgs bosons is the Large Hadron Collider, which collides protons at a centre of mass energy of 13 TeV. However, probing H->bb decays in hadron collisions is experimentally challenging. I will present measurements of H->bb decays in associated production of a Higgs boson with a W or Z boson with the ATLAS experiment. The VH production channel provides the best sensitivity to this decay and played a crucial role in the first H->bb observation. The VH,H->bb channel is also very powerful to perform measurements of VH production kinematics. The VH,H->bb measurement strategy as well as the latest results measuring the cross-section of this process as a function of the transverse momentum will be discussed. The novel combination of VH,H->bb measurements to reach higher momentum scales and probe anomalous BSM couplings will be highlighted as well.

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The experimental particle physics seminar series invites speakers from all over Europe to discuss the latest developments at the LHC, accelerator and non-accelerator based neutrino physics, hardware R&D and astroparticle physics. .

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