Search for the standard model deviations in top quark precision studies at CMS

Precision studies of top quark properties provide a unique playground to test the predictions of the standard model and to search for new physics. Reviewed results from the CMS experiment done with the data collected at 8 TeV include studies of top quark Wtb anomalous and FCNC couplings, polarization, CP-violation, and spin correlation effects. No significant deviations from the SM predictions are observed.Comment: Presented at 29th Rencontres de Blois (Blois 2017), Blois, Franc

First observation of the ttˉH\mathrm{t\bar{t}H} process at CMS

The top quark and the Higgs boson play a special role in the fundamental interactions of the standard model. The observation of the top quark pair production in association with the Higgs boson establishes the first direct measurement of the tree-level coupling of the Higgs boson to the top quark. The analysis of the data collected by the CMS detector results in the overall observed significance of 5.2 standard deviations for this process.Comment: Presented at 11th International Workshop on Top Quark Physics 2018 (TOP 2018), Bad Neuenahr, German

Rare top quark production and decays at ATLAS and CMS

The most recent studies in the top quark sector are reviewed with the focus on the rare production mechanisms and suppressed decays. The experimental results obtained with the ATLAS and CMS detectors in proton-proton collisions at the center-of-mass energy of 13 TeV include the measurements of the associated production of top quark pairs with vector bosons (${\rm t\bar{t}W}$, ${\rm t\bar{t}Z}$, ${\rm t\bar{t}\gamma}$), the first evidence for the ${\rm t(\bar{t})\gamma q}$ process, the first observation of the ${\rm t(\bar{t})Zq}$ production, the study of the ${\rm t\bar{t}+b\bar{b}}$ and ${\rm t\bar{t}+t\bar{t}}$ processes, as well as searches for lepton flavour violation in top quark decays and effective field theory interpretations. The experimental results show good agreement with the theoretical predictions.Comment: Presented at the 2019 EW session of the 54th Rencontres de Moriond, La Thuile, Ital

Search for flavour-changing neutral currents with top quarks

Flavour-changing neutral currents are extremely rare processes in the standard model that can be sensitive to various new physics effects. The summary of the latest experimental results from the LHC experiments is given. Preliminary results of sensitivity studies for future colliders are also discussed.Comment: Presented at 10th International Workshop on Top Quark Physics 2017 (TOP 2017), Braga, Portuga

Particles in a pocket

Communicating science through mobile smartphone and tablet applications is one of the most efficient ways to reach general public of diverse background and age coverage. The Higgsy project was created in 2022 to celebrate the 10th anniversary of the discovery of the Higgs boson at CERN. This project introduces a mobile game to search for the Higgs boson production in a generic particle detector. The MatterBricks is an augmented-reality project that was created for a major national event in Belgium, held in 2023. The main features of the two mobile applications and further prospects for reaching general public through mobile application development process are discussed.Comment: Presented at the European Physical Society Conference on High Energy Physics (EPS-HEP) 2023, Hamburg, German

Flavour-changing neutral scalar interactions of the Top Quark

A study of the top-quark interactions via flavour-changing neutral current (FCNC) processes provides an intriguing connection between the heaviest elementary particle of the standard model (SM) of particle physics and the new scalar bosons that are predicted in several notable SM extensions. The production cross sections of the processes with top-scalar FCNC interactions can be significantly enhanced to the observable level at the CERN Large Hadron Collider. The present review summarises the latest experimental results on the study of the top-quark interactions with the Higgs boson via an FCNC and describes several promising directions to look for new scalar particles.NC is supported by the FCT—Fundação para a Ciências e a Tecnologia, Portugal, under project CERN/FIS-PAR/0032/2021

Focus topics for the ECFA study on Higgs / Top / EW factories

In order to stimulate new engagement and trigger some concrete studies in areas where further work would be beneficial towards fully understanding the physics potential of an $e^+e^-$ Higgs / Top / Electroweak factory, we propose to define a set of focus topics. The general reasoning and the proposed topics are described in this document.Comment: v3: fixed spelling of two author