Conveners
Top Parallel: Top Parallel
- Mahsana Haleem
- Hugo Alberto Becerril Gonzalez (CMS (CMS Fachgruppe TOP))
Top Parallel: Top Parallel
- Hugo Alberto Becerril Gonzalez (CMS (CMS Fachgruppe TOP))
- Mahsana Haleem
The production of top quark pairs in association with a photon ($t\bar{t}\gamma$) is an important process to investigate the coupling between photon and top quark. Precise measurements of this coupling allow to test the Standard Model (SM) and probe for new physics effects. The use of Standard Model Effective Field Theory (SMEFT) models new physics phenomena beyond the SM via the introduction...
A presicion measurement of the top quark pair production cross-section at 13.0 TeV, based on 59.8 fb-1 of the 2018 CMS data is presented. A new method combining both dilepton and lepton+jets channels is used to constrain the lepton and b-tag scale factors. The currently expected systematic uncertainty, excluding that of the luminosity, is 1.5%.
The t-channel production is the dominant process for single top quark and single top antiquark production at the LHC.
The presented analysis measures the total cross-sections for top-quark and top-antiquark production $\sigma(tq)$ and $\sigma(\bar{t}q)$ as well as the combined cross-section
$\sigma(tq+\bar{t}q)$ and the cross-section ratio $R_{t}=\sigma(tq)/\sigma(\bar{t}q)$.
The full Run...
In the years 2016-2018 the CMS Experiment at CERN's Large Hadron Collider (LHC) recorded a large amount of proton-proton collision data at a centre of mass energy of 13 TeV, corresponding to an integrated luminosity of 138 fb$^{-1}$. With this large dataset, the associated production of top quarks with the Z boson has been measured precisely and differentially. However, background processes...
Quantum entanglement is a fundamental prediction of quantum mechanics and the experimental achievements with electrons and photons were recognised by the Nobel Prize in Physics 2022. At the LHC, quantum entanglement can be observed in top quarks, testing quantum mechanics at high energies. Therefore, a sensitivity study for a possible measurement of quantum entanglement in the top quark pair...
Precision top mass measurements at hadron colliders have been notoriously difficult. The fundamental challenge in the existing approaches lies in achieving simultaneously high top mass sensitivity and good theoretical control. Inspired by the use of standard candles in cosmology, we overcome this problem by showing that a single energy correlator-based observable can be constructed that...
We present the first evidence for the production of a top quark in association with a W and a Z boson. The analysis employs proton-proton collision data collected in the years 2016-2018 at a center-of-mass energy of 13 TeV by the CMS Experiment, for a total integrated luminosity of 138 fb$^{-1}$.
We target the multilepton final state of the process, where we consider two charged leptons being...
The Higgs boson production in association with a top quark pair plays a key role for studying the Yukawa coupling between the Higgs boson and the top quark. The coupling can be determined by measuring the cross-section of the $t\bar{t}H$ production in various final states using the $140\,\text{fb}^{-1}$ ATLAS dataset at $\sqrt{s}=13\,\text{TeV}$. Multi-lepton final states are rare but pure...