The discovery of the Higgs boson in 2012 by the ATLAS and CMS experiments at the Large Hadron Collider (LHC) marked a major milestone in particle physics. Since then, Standard Model (SM) Higgs processes have been studied with unprecedented precision, extending into kinematically challenging regimes and rare production and decay modes. These precision measurements not only test the SM but also...
In the framework of the Standard Model Effective Field Theory (SMEFT), the Standard Model can be seen as a low-energy approximation of a deeper, more fundamental theory that introduces new heavy particles at a higher energy scale, $\Lambda$. By integrating out these beyond-the-Standard-Model (BSM) particles, SMEFT offers a model-independent way to describe their potential effects.
This talk...
In 140$~$fb$^{-1}$ of proton-proton collision data recorded by the ATLAS detector in Run 2 of the LHC, an excess was observed in both the W$^{\pm}$Z and W$^{\pm}$W$^{\pm}$ channels with a combined global significance of 2.5 standard deviations. This excess could be attributed to the production of singly- and doubly-charged Higgs bosons, which are hypothesized by the Georgi-Machacek$~$(GM)...
The Belle II experiment has accumulated 575 fb⁻¹ of data from the SuperKEKB asymmetric electron-positron collider. We present the current status of the search for low-mass dark photons (A′) from $e^+e^- \rightarrow A'\gamma \rightarrow e^+e^-\gamma $reaction based on collision data recorded by the Belle II experiment. The dark photon is a hypothetical gauge boson that would appear as a narrow...
Despite dark matter’s existence and high abundance in our universe being well supported by cosmological evidence, our current understanding of it is limited due to the lack of observations of dark matter interactions on the particle scale. If and how the Standard Model interacts with the dark sector remains a major open question in particle physics. The DarkLight experiment attempts to...