This poster presents the latest result on ATLAS Run 3 electron and photon in situ energy scale and resolution calibration
Projection studies for non-resonant Higgs boson pair production via vector-boson fusion in the 4b final state with the luminosity-upgraded ATLAS detector at the High Luminosity LHC (HL-LHC) are presented. These studies are the first HL-LHC prospects on the boosted di-Higgs topology, where each Higgs boson is constructed as a single large-radius jet. The latest Run 2 analysis results using 140...
We study the prospects for observing exotic decays of the Standard Model (SM) Higgs boson $h$ into light beyond the Standard Model (BSM) scalars $a$ with mass $m_{a} \lesssim m_{h}/2$ in the single Higgs and Higgs pair production channels at the High Luminosity run of the Large Hadron Collider (HL-LHC). Discovery prospects for single Higgs production in the gluon-gluon fusion and vector boson...
A search for the resonant production of a heavy scalar 𝑋 decaying into a Higgs boson and a new lighter scalar 𝑆, through the process 𝑋 → 𝑆(𝑏𝑏)𝐻(𝛾𝛾), where the two photons are consistent with the Higgs boson decay, is performed. The search is conducted combining an integrated luminosity of 140 fb−1 of proton-proton collision data at a centre-of-mass energy of 13 TeV, and 58.6 fb-1 of...
A search is presented for non-resonant Higgs boson pair production decaying to multi-lepton final states using 140 fb-1 of proton-proton collision data at centre-of-mass energy 13 TeV, recorded with the ATLAS detector during Run 2 of the LHC. Nine search channels with varying multiplicities of electrons, muons, taus, and photons are combined to determine the observed (expected) limit on the...
The study of boosted Higgs boson pair (HH) production enables the development of advanced reconstruction and identification techniques crucial for probing the Higgs self-coupling and potential new physics beyond the Standard Model. In this work, we focus on methodologies for analyzing the boosted topology, where one Higgs boson is produced with high transverse momentum, leading to collimated...
The shape of the Higgs potential is yet to be studied experimentally by the determination of the Higgs boson self-interaction couplings. While the trilinear coupling has already been constrained by measuring the inclusive di-Higgs production, the quartic coupling has only been constrained recently by direct experimental measurements. Quartic higgs self coupling can be accessed directly in...
We present an updated prospect study on di-Higgs production in the HH→bbγγ decay channel with the ATLAS experiment at the High Luminosity LHC (HL-LHC). The latest projections are based on extrapolating the recent legacy Run 2 ATLAS search and therefore improve over the previous results shown
In this poster, we present a study of di-Higgs production in the HH→bbγγ decay channel using data from the ATLAS experiment. This channel is considered one of the "golden channels" for constraining the Higgs self-coupling, benefiting from the high branching ratio of the H→bb decay and the excellent ATLAS photon triggers. The analysis employs Boosted Decision Trees (BDTs) to define event...
