Periodic Reporting for period 3 - HiggsSelfCoupling (Uncovering the Origins of Mass: Discovery of the di-Higgs Process and Constraints on the Higgs Self-Coupling)
Período documentado: 2022-06-01 hasta 2023-11-30
A particularly crucial measurement is the production cross-section of Higgs boson pairs, which provides unique information on the Higgs self-coupling and on the underlying nature of the electroweak symmetry breaking mechanism. The overall shape of the Higgs potential depends on the value of Higgs self-coupling. The HH--> bb decay channel has the highest branching ratio (~0.33) among all possible 2H decay channels. It is therefore a promising channel to use, given the fact that the production rate for Higgs pairs is already very low. This project aims to develop and complete the measurement of the di-Higgs cross section and most stringent bounds on the Higgs self-coupling. To achieve this goal new new experimental techniques to improve the background reduction rates and enhance the signal will be developed. The objectives are the development of novel bottom quark energy reconstruction algorithms, new bottom quark and Higgs identification techniques, and neural network analysis tools. Analysis of ATLAS data will then enable searches for New Physics and ultimately the di-Higgs cross section measurement to constrain the Higgs self-coupling. This landmark measurement will lead to the confirmation of how particles acquire mass and open new avenues to understand what lies beyond the Standard Model.
The project team focused on getting ready for the start of the Run3 data taking period in 2022.