Conveners
Joint WG3+WG4 session:: Top-quark physics: new theoretical and experimental results
- Olga Evdokimov (University of Illinois at Chicago (US))
- Xuan Li (Los Alamos National Laboratory)
- Adam Orion Martin (University of Notre Dame (US))
- Heidi Angelika Rzehak
- Maria Vittoria Garzelli
- Heather Gray (UC Berkeley/LBNL)
The most recent results on top quark physics, obtained using data collected with the CMS experiment at 5.02 and 13 TeV center-of-mass energies, are presented.
The large top quark samples in top quark pair and single top production have yielded measurements of the production cross section of unprecedented precision and in new kinematic regimes. They have also enabled new measurements of top quark properties that were previously inaccessible. In this contribution the highlights of the ATLAS top quark precision program are presented. ATLAS presents in...
Run 2 of the LHC has witnessed the observation of many rare top quark production processes predicted by the Standard Model and has boosted searches for flavour-changing-neutral-current interactions of the top quark, that are heavily suppressed in the SM. In this contribution highlights of searches by the ATLAS experiment for rare processes involving top quarks are shown. Results are presented...
Evidence for the production of top quarks in heavy ion collisions is reported in a data sample of lead-lead collisions recorded in 2018 by the CMS experiment at a nucleon-nucleon center-of-mass energy of $\sqrt{s_{_{\mathrm{NN}}}} = 5.02$ TeV, corresponding to an integrated luminosity of $1.7\pm0.1\,\mathrm{nb}^{-1}$. Top quark pair ($\mathrm{t\bar{t}}$) production is measured in events with...
Single top quarks are mainly produced through a t-channel W boson exchange, $q + b \to q^\prime + t$, at the LHC. The computation of the last missing ingredient for NNLO QCD corrections, the non-factorisable two-loop amplitude, was recently completed.
Despite being colour-suppressed and hence previously neglected, there is reason to expect this correction to have an impact comparable to that...
We present calculations of QCD corrections for the associated production of a single top quark and a photon ($tq\gamma$) in proton-proton collisions. We calculate the NLO cross section as well as the approximate NNLO (aNNLO) cross section with soft-gluon corrections, including theoretical uncertainties, at collider energies of up to 100 TeV. We show results with various choices of parton...
I present theoretical results for top-antitop pair production cross sections at current and future collider energies up to 100 TeV. I discuss the contribution of higher-order terms in the perturbative series. I show the very high quality of the soft gluon approximation through NNLO and the effect of contributions at aN$^3$LO.
In this work, the spectra for the observables, $q_{\mathrm{T}}^{\mathrm{out}}=\left| \vec{q}_{t\bar{t}}\cdot \Big(\frac{\vec{p}_{t}}{|\vec{p}_{t}|}\times\vec{n}\Big) \right|$ and $q_{\mathrm{T}}^{\mathrm{in}}=\sqrt{q_{\mathrm{T}}^2-(q_{\mathrm{T}}^{\mathrm{out}})^2}$, are investigated for the process $pp\to t\bar{t}X$. Here $\vec{p}_t$ stands for the spatial momentum of the top quark and...
We discuss the impact of top-quark pair production differential cross section measurements from CMS and ATLAS at center of mass energy of 13 TeV on the CT18 proton PDFs. We discuss various phenomenological aspects of novel QCD analyses obtained with this extended baseline of data sets and in particular the impact on the gluon PDF.
Heavy meson production in reactions with nuclei is a new frontier to understand QCD dynamics and hadronization in nuclear matter. Measurements in various colliding systems, including Pb-Pb, Xe-Xe, O-O, p-Pb, and p-O at the LHC and the upcoming sPHENIX experiment, enable precision tests of the medium-size, temperature, and mass dependencies of the in-medium QCD evolution. We employ a coupled...
