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Shota Suzuki (High Energy Accelerator Research Organization (JP))28/08/2017, 14:00Top, heavy quarks and searches
Measurements of the inclusive and differential cross-sections for top-quark pair and single top production cross sections in proton-proton collisions with the ATLAS detector at the Large Hadron Collider are presented at center-of-mass energies of 8 TeV and 13 TeV. The inclusive measurements reach high precision and are compared to the best available theoretical calculations. These...
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Otto Heinz Hindrichs (University of Rochester (US))28/08/2017, 14:30Top, heavy quarks and searches
Measurements of the inclusive and differential top quark pair production cross section in proton-proton collisions at 5.02 TeV, 7 TeV, 8 TeV and 13 TeV are presented using the CMS detector. The total cross section is measured using the lepton+jets, dilepton and fully hadronic channels, including the tau-dilepton and tau+jets modes. Indirect constraints on both the top quark mass and ɑS are...
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Christian Schwinn (RWTH Aachen University)28/08/2017, 15:00Resummation and Monte Carlo generators
Current predictions for the total top-quark pair production cross section are based on NNLO QCD corrections with NNLL soft-gluon resummation. I will discuss the perspectives to go beyond this approximation by using known ingredients for N3LL soft-gluon resummation and Coulomb corrections.
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Duncan Alexander Leggat (IHEP, China)28/08/2017, 15:30Top, heavy quarks and searches
Several measurements of single top quark production in proton-proton collisions at the LHC at centre-of-mass energies of 7, 8 and 13 TeV, using data collected with the CMS experiment, are presented. The analyses investigate separately the productions of top via t-channel exchange, in association with a W boson (tW) or via the s-channel. Final states with at least one charged lepton and one...
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Dr Fred Stober (Hamburg University (DE))28/08/2017, 17:00Top, heavy quarks and searches
Measurements of the top quark mass and width using proton-proton collisions at the LHC at centre-of-mass energies of 7, 8 and 13 TeV are presented. The analyses used different decay channels and production modes of the top quark. Several techniques are investigated based on the reconstruction of the top kinematics from final state products, using leptonic decays with a J/psi, the shapes of top...
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Heribertus Bayu Hartanto (Durham University)28/08/2017, 17:30Top, heavy quarks and searches
We present a NLO QCD calculation of ttj production at the LHC in the dilepton channel, where
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all non-resonant diagrams, interferences and off-shell effects of the top quark are included. We investigate different choice of dynamical scales in order to stabilize the perturbative convergence of the differential distributions
far away from the threshold. We will also discuss the application of... -
Gennaro Corcella (INFN - LNF)28/08/2017, 18:00Top, heavy quarks and searches
I will discuss the theoretical uncertainties on the top-quark mass
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determination, due to bottom-quark fragmentation in top decays.
In particular, the fragmentation parameters in both HERWIG and PYTHIA, the two main parton shower generators, will be taken into account and their impact on several
observables, relevant form the top-mass extraction, will be investigated.
Furthermore, I will also... -
Abilio De Freitas (DESY - Zeuthen)29/08/2017, 14:00
We report on our recent progress on the calculation of massive operator matrix elements (OMEs), which at three loop level receive contributions from Feynman diagrams containing two heavy quark lines of different masses. These OMEs are needed in order to obtain the corresponding contributions for the massive Wilson coefficients in deep inelastic scattering at large momentum transfer. They are...
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Alessandro Broggio (Technische Universitaet Muenchen)29/08/2017, 14:30Top, heavy quarks and searches
I am going to present some recent results on the resummation of soft gluon emission corrections to the production of a top-antitop pair in association with a Higgs/W/Z boson at the Large Hadron Collider.
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First I will introduce and describe the derivation of the soft-gluon resummation formula for these processes. Based on this formula, we developed a dedicated parton-level Monte Carlo program.... -
Anna Kulesza29/08/2017, 15:00Top, heavy quarks and searches
The measurement of the associated production of a Higgs boson with a pair of top quarks is among the highest priorities of the current LHC physics program. In this talk latest results for threshold resummation of soft gluon corrections for the $pp \to t\bar{t}H$ process will be presented. The resummation is carried out at next-to-next-to-leading-logarithmic accuracy using the direct QCD Mellin...
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Silvano Tosi (INFN e Universita Genova (IT))29/08/2017, 16:30Top, heavy quarks and searches
State-of-the-art theoretical predictions accurate to next-to-leading order QCD interfaced with Pythia8 and Herwig++ event generators are tested by comparing the unfolded ttbar differential data collected with the CMS detector at 8 and 13 TeV. These predictions are also compared with the underlying event activity distributions in ttbar events using CMS proton-proton data collected at a center...
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Benedikt Biedermann (Universitaet Wuerzburg)29/08/2017, 17:00Top, heavy quarks and searches
In this talk, the combination of the one-loop matrix-element generator Recola with the multipurpose Monte Carlo program Sherpa is presented. Since both programs are highly automated, the resulting Sherpa+Recola framework allows for the computation of—in principle—any Standard Model process at both NLO QCD and EW accuracy. The reliability of the Sherpa+Recola framework will be demonstrated via...
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Silvano Tosi (INFN and Università di Genova)29/08/2017, 17:30
Several measurements of top quark properties are presented using data collected by the CMS experiment at different centre-of-mass-energies. The properties are mostly probed in production of the top quarks. The charge asymmetry is measured inclusively and differentially probing anomalous couplings to the gluons at production mode. These measurements are extended searching for asymmetries in...
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Javier Cuevas Maestro (Universidad de Oviedo)31/08/2017, 16:00
A comprehensive set of measurements of top quark pair production in association with EWK bosons (W, Z or ɣ) is presented at different centre-of-mass energies. The results are compared to the theory predictions and re-interpreted as searches for new physics inducing deviations from the standard model predictions using an effective field theory approach. The status of the search for double-ttbar...
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Joseph Haley (Oklahoma State University (US))31/08/2017, 16:30Top, heavy quarks and searches
Searches for new resonances that decay either to pairs of top quarks or a top and a b-quark will be presented. The searches are performed with the ATLAS experiment at the LHC using proton-proton collision data collected in 2015 and 2016 with a centre-of-mass energy of 13 TeV. The invariant mass spectrum of hypothetical resonances are examined for local excesses or deficits that are...
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Tomas Jezo (University of Zurich)31/08/2017, 17:00
We estimate the top-quark mass extraction uncertainty due to Monte Carlo modeling of top-pair production and its leptonic decay. Using three different NLO+PS generators based on the POWHEG method implementing an increasingly precise treatment of t?t production and decay, including hvq and bb4l, and two different PS implementations we obtain predictions for various kinematic distributions...
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TBA
A comprehensive set of measurements of top quark pair production in association with EWK bosons (W, Z or ɣ) is presented at different centre-of-mass energies. The results are compared to the theory predictions and re-interpreted as searches for new physics inducing deviations from the standard model predictions using an effective field theory approach. The status of the search for double-ttbar...
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TBATop, heavy quarks and searches
Several measurements of top quark properties are presented using data collected by the CMS experiment at different centre-of-mass-energies. The properties are mostly probed in the decay of the top quarks. The Wtb couplings are probed by measuring the helicity fractions in single top and ttbar topologies or by inspecting a V-A vertex structure of the coupling. Furthermore, searches for...
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TBATop, heavy quarks and searches
The top quark is unique among the known quarks in that it decays before it has an opportunity to form hadronic bound states. This makes measurements of its properties particularly interesting as one can access directly the properties of a bare quark. The latest measurements of these properties with the ATLAS detector at the LHC are presented using 8 TeV and 13 TeV data. Measurements of top...
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