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Speaker: Alex Wang (UCSC) – Title: Searching for di-Higgs production with the bbγγ final state: early Run 3 and beyond
July 24 @ 4:00 pm - 5:00 pm
Research Progress Meeting
Date: July 24, 2025
Time: 4:00- 5:00 pm
Location: Sessler Conference Room- 50A-5132 [In-Person and HYBRID]
Speaker: Alex Wang (UCSC)
Title: Searching for di-Higgs production with the bbγγ final state: early Run 3 and beyond
Abstract: Since the discovery of the Higgs boson by the ATLAS and CMS experiments in 2012, many of its properties have been constrained by precision measurements using LHC Run 2 data. One notable exception is the Higgs self coupling lambda, which modifies the shape of the Higgs potential and, in the Standard Model, is completely determined by the Higgs mass and vacuum expectation value. A value of lambda different from the Standard Model prediction could have profound implications for particle physics and cosmology. The simultaneous production of two Higgs bosons (di-Higgs), is the most accessible way to study this coupling at the LHC but presents experimental challenges due to its low production cross-section, about three orders of magnitude smaller than that of single Higgs.
In this talk, I will present the latest ATLAS search for di-Higgs production with the bbγγ final state, in which one Higgs decays into a pair of b-quarks and the other decays into a pair of photons. This is one of the most experimentally powerful channels due to the high H->bb branching ratio and the excellent ATLAS photon resolution. With the inclusion of the Run 2 (2015 – 2018) and early Run 3 (2022 – 2024) LHC datasets, these new results constitute both the first ATLAS result using over 300ifb of data and also the world’s best single-channel di-Higgs constraints to-date. Finally, I will discuss the latest prospects for the High Luminosity LHC, which is expected to increase the dataset by over a factor of 10 and bring us within observation of di-Higgs production.
https://lbnl.zoom.us/j/98854322464?pwd=K2tKUm1VZjRlV1J5RHE3cXdHQzRxdz09
Meeting ID: 988 5432 2464
Passcode: 142239