2019 Meeting of the Division of Particles & Fields of the American Physical Society

Session

Top Quark Physics

1 Aug 2019, 14:00

Shillman 325 (Northeastern University)

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

80. Theoretical predictions for top-quark production processes

Nikolaos Kidonakis (Kennesaw State University)

01/08/2019, 14:00

Top Quark Physics

Oral Presentation

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.

312. Measurement of the top quark Yukawa coupling from tt¯ differential cross sections in the lepton+jets final state in proton-proton collisions at sqrt(𝑠)=13 TeV

Prof. Regina Demina (University of Rochester)

01/08/2019, 14:20

Top Quark Physics

Oral Presentation

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...

142. Prospects for Measuring the Four-Top Production Cross Section using 139fb${}^{-1}$ of Data in $pp$ Collisions at $\sqrt{s}=$ 13 TeV with the ATLAS Detector

Rachel Elizabeth Lindley (University of Arizona (US))

01/08/2019, 14:40

Top Quark Physics

Oral Presentation

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....

210. Search for standard model production of four top quarks

Caleb Arthur Fangmeier (University of Nebraska Lincoln (US))

01/08/2019, 15:00

Top Quark Physics

Oral Presentation

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.

350. Top quark pair production: window into polarized gluon distributions

Dr Gary Goldstein (Tufts University)

01/08/2019, 16:00

Top Quark Physics

Oral Presentation

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...

364. Precision measurement of the top quark spin correlations at CMS

Jason Robert Thieman (Purdue University (US))

01/08/2019, 16:20

Top Quark Physics

Oral Presentation

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...

113. Measurement of top quark decay width in the dilepton channel from pp collisions at 13 TeV with CMS data

Wenyu Zhang (Brown University (US))

01/08/2019, 16:40

Top Quark Physics

Oral Presentation

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...

132. Soft-gluon corrections for single top quark production in association with electroweak bosons

Matthew Forslund (Kennesaw State University)

01/08/2019, 17:00

Top Quark Physics

Oral Presentation

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...

87. Complete measurement of the top-quark polarisation in t-channel single top-quark production with ATLAS detector

Runyu Bi (University of Pittsburgh (US))

01/08/2019, 17:20

Top Quark Physics

Oral Presentation

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, $ub\to dt$ and $\overline{d}b\to \overline{u}t$
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...

250. Search for single top quark production in association with a photon in pp collisions at $\sqrt{s}$ = 13 TeV with the ATLAS experiment at the LHC

Harish Potti (University of Texas at Austin (US))

01/08/2019, 17:40

Top Quark Physics

Oral Presentation

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...