* Speaker: Jeremy Bernon (LPSC Grenoble) & Beranger Dumont (IBS CTPU)
* Time and date: 2-2:30pm, January 22
*
Abstract: The discovery of a particle with properties very similar to
those of the Standard Model (SM) Higgs boson is one impressive success
of LHC Run I. This new sector which is now experimentally accessible
could be intimately connected to the mechanism at the origin of the
electroweak symmetry breaking. Precise determination of the properties
of this particle could therefore have profound implications.
Presenting
first the different production and decay modes of a SM-like Higgs
boson, I will then discuss the current status of the Higgs measurements
at the LHC. Using the ATLAS and CMS experimental results, an
approximation to the Higgs likelihood can be constructed and used to
constraint various new physics scenarios. Introducing the public code
Lilith, details about this construction and the underlying hypotheses
are given. I will finally show results of various fits in terms of
combined signal strengths, reduced couplings and in the context of the
Two-Higgs-Doublets models of type I/II. Limits on invisible/unseen
branching ratios are also derived.
* References:
- Jeremy Bernon, Beranger Dumont, Sabine Kraml, arXiv:1409.1588
- Jeremy Bernon, John F. Gunion, Yun Jiang, Sabine Kraml, arXiv:1412.3385
In the remaining time (2:30-3pm),
I would like to present and discuss a recent proposal by Kyle Cranmer,
Sven Kreiss, David Lopez-Val, and Tilman Plehn for decoupling
theoretical uncertainties from experimental measurements of the Higgs
boson. This new way of presenting Higgs results would be an important
step forward as one could treat all theoretical uncertainties (possibly
common to several measurements) in a consistent way. It also makes it
possible to reevaluate the theoretical uncertainties a posteriori, once
new calculations become available.
Best,
Beranger