Conveners
Top Quark Physics
- Reinhard Schwienhorst (Michigan State University (US))
- Louise Skinnari (Northeastern University (US))
- Nikolaos Kidonakis (Kennesaw State University)
Top Quark Physics
- Nikolaos Kidonakis (Kennesaw State University)
- Reinhard Schwienhorst (Michigan State University (US))
- Louise Skinnari (Northeastern University (US))
Description
parallel sessions
I present theoretical results through three loops and N3LO for soft-gluon corrections in a variety of processes involving top-quark production. In particular, I present results for total cross sections and differential distributions in single-top production and top-pair production as well as in top-quark processes with electroweak bosons and new physics.
We present a measurement of the top quark Yukawa coupling derived from the top quark-antiquark (tt¯) differential production cross sections. tt¯ is reconstructed in the lepton+jets channel. Corrections to tt¯ production due to virtual exchange of electroweak bosons, including the Higgs boson, can produce large distortions of differential distributions near the production. Therefore precise...
The production of four top-quarks, a rare final state predicted by the Standard Model, has never been seen at the 3$\sigma$ level. Additionally, this final state may be particularly sensitive to physics beyond the Standard Model. The ATLAS search for four top-quark production using 2015-2018 data collected at $\sqrt{s} = $ 13 TeV, with a combined luminosity of 139 fb$^{-1}$, is in progress....
This talk describes efforts towards a first measurement of the standard model production of four top quarks with results based on up to the full Run 2 dataset. It includes implications of this measurement to constrain properties of the Higgs Boson and new physics scenarios including dark matter.
Top-antitop pairs are produced prolifically in p+p collisions at the LHC, primarily by gluon fusion. At intermediate values of momentum fraction x for each gluon in g+g to t+tbar, the spin dependences of gluon distributions leave imprints on the momentum and spin correlations of the top pairs. These correlations are distinguishable from the quark-antiquark annihilation mechanism. Decays of...
Talk covers the new result by CMS on the measurement of the full spin density production matrix, which includes measurements of variables sensitive to the top quark spin correlation, polarization and other angular observables. Employs events containing two leptons produced in proton-proton collisions at a center-of-mass energy of 13 TeV. Uses data corresponding to an integrated luminosity of...
We present a direct measurement of the top quark decay width with events from proton-proton collisions at a center-of-mass energy of 13 TeV. The data were taken by the CMS detector in 2016, corresponding to an integrated luminosity of 35.9 fb-1. The measurement is performed using the dilepton final state of the ttbar system which are selected containing two charged leptons and at least two...
We present results for higher order soft-gluon radiative corrections for single top quark production in association with electroweak bosons, including t gamma and t Z production via anomalous FCNC couplings. We provide results for the total cross sections and differential distributions at LHC energies and beyond. We use K-factors to show the significance of the corrections compared to leading...
At the LHC, electroweak production of single top quarks in the $t$-channel
leads, in the standard model, to a high degree of top quark polarization.
Two subprocesses, $u b \rightarrow d t$ and $\bar{d} b \rightarrow \bar{u} t$
contribute to $t$-channel production of single top, while charge-conjugate
processes contribute to production of antitop. A high degree of top quark
polarization along...
Measuring the cross-section of single top quark production in association with a photon ($tq\gamma$) is an important test for the Standard Model. However, this process has not been observed yet. It is sensitive to the top quark charge and its interactions with $W^{\pm}$ bosons and photons. In this talk, I will present the status of ATLAS experiment's search for $tq\gamma$ production using 149...
