Conveners
Top Physics
- There are no conveners in this block
Top Physics
- There are no conveners in this block
Top Physics
- Andrew Ivanov (Kansas State University (US))
- Christopher Neu (University of Virginia (US))
Top Physics
- There are no conveners in this block
Nikolaos Kidonakis
(Kennesaw State University)
04/08/2015, 14:00
Top Physics
I present a calculation of higher-order corrections from NNLL threshold resummation for cross sections and differential distributions in top-antitop pair production and in single-top production. I show that soft-gluon threshold corrections are the dominant contribution to top-quark production and closely approximate exact results through NNLO. I show aN$^3$LO results for the total $t{\bar t}$...
Thomas Andrew Schwarz
(University of Michigan (US))
04/08/2015, 14:30
Top Physics
The most up-to-date top quark pair production cross section measurements will be presented for p-p collisions with the ATLAS detector at the LHC. Both differential and inclusive measurements will be discussed, as well as analyses focusing on rare decays such as top quark pairs associated with an additional boson or jets. The results will be discussed in the context of new physics, Monte...
Dr
Gabriele Benelli
(University of Kansas and Fermilab LPC Distinguished Researcher)
04/08/2015, 15:00
Top Physics
Top pair production cross-section measurements and theoretical predictions have achieved unprecedented precision. A review is presented of recent top-quark pair inclusive and differential production cross sections in proton-proton collisions at the LHC at centre-of-mass energies of 7 and 8 TeV, using data collected by the CMS experiment in the years 2011 and 2012. The differential...
Rebeca Gonzalez Suarez
(University of Nebraska (US))
04/08/2015, 16:00
Top Physics
The Run-1 of the LHC was very successful for single top physics in CMS. The main single top production mode, t-channel, is well established. The t-channel cross-section was measured with unprecedented precision and t-channel events have been used for the first time to perform measurement of SM properties, such as: |Vtb|, top quark polarization, or W-helicity fractions. The associated...
Kenneth Bloom
(University of Nebraska (US))
04/08/2015, 16:30
Top Physics
We present the most recent measurements on top-quark physics obtained with Tevatron $p \bar p$ collisions recorded by the D0 experiment at $\sqrt s=1.96$ TeV. The full Run II data set of 9.7 fb$^{-1}$ is analyzed. Both lepton+jets and dilepton channels of top-quark pair production are used to measure the differential and inclusive cross-sections, the forward-backward asymmetries, the...
Philip Ilten
(Massachusetts Inst. of Technology (US))
04/08/2015, 17:00
Top Physics
Excellent vertexing, tracking, and jet energy resolution enable a
variety of forward analyses to be performed using data from the LHCb
detector. Recent results on the performance of inclusive b and
c-tagging algorithms used by LHCb are presented. These taggers are
applied to W+jet data to measure W+b-jet and W+c-jet asymmetries as
well as ratios to inclusive W+jet production....
Graham Wilson
(University of Kansas (US))
04/08/2015, 17:30
Top Physics
The International Linear Collider and Compact Linear Collider projects aim to build a linear electron-positron collider with a center-of-mass energy well above the top quark pair production threshold. In this contribution an overview is presented of the potential of their top quark precision physics programme. One of the highlights is a precise determination of the top quark mass through a...
Zhi Liu
(Indiana University)
05/08/2015, 14:00
Top Physics
Signals for Lorentz and CPT violation can appear in a wide range of experiments including hadron colliders like the LHC. We present a calculation of the Lorentz-violating cross section for top-quark pair production via gluon fusion. This process dominates at the LHC, and analysis of LHC data should permit sharpening the constraints on top-quark Lorentz violation obtained recently by the D0...
Daniel Marley
(University of Michigan (US))
05/08/2015, 14:55
Top Physics
A summary of results for the top quark charge asymmetry, $\text{A}_{\text{C}}$, measured using 20.3 fb$^{-1}$ of data recorded with the ATLAS detector at a center-of-mass energy $\sqrt{s}=8$ TeV is presented.
Events where either both top quarks decay leptonically (dileptonic), or one top quark decays leptonically and the other hadronically (semi-leptonic) are considered. The semi-leptonic...
Andrew Brinkerhoff
(University of Notre Dame (US))
05/08/2015, 16:00
Top Physics
New measurements of top quark pair production in association with a W or Z boson are presented, using 19.5 fb−1 of 8 TeV pp collision data collected by the CMS experiment at the CERN LHC. Final states with opposite-sign, same-sign, three, and four charged leptons plus b-tagged jets are examined. Signal ttW and ttZ events are identified by reconstructing the top quark pair, yielding the most...
Chen Zhou
(Duke University (US))
05/08/2015, 16:25
Top Physics
We present a measurement of the production cross sections of top quark pairs in association with a W or Z boson. The measurement uses 20.3 $fb^{-1}$ of data from proton-proton collisions at $\sqrt{s}$=8 TeV recorded by the ATLAS detector at the LHC at CERN. Four different final states are considered: two opposite-sign leptons, two same-sign leptons, three leptons, and four leptons. We report...
Andrew Ivanov
(Kansas State University (US))
05/08/2015, 16:50
Top Physics
We present a measurement of the production cross-section of top-quark pairs in association with a photon in pp collisions at center-of-mass energy of 8 TeV. The data was recorded at the CMS experiment, corresponding to 19.7 fb-1 integrated luminosity. The measurement is performed in dilepton and lepton+jets final states. Data-driven methods are used to estimate the photon identification...
Jesse Alan Heilman
(University of California Riverside (US))
05/08/2015, 17:15
Top Physics
A search is presented for standard model (SM) production of four top quarks in pp collisions at the LHC. Using Run-1 data corresponding to an integrated luminosity of 19$fb^{-1}$, a combination of kinematic reconstruction and multivariate techniques is used to distinguish between the small signal ($\sigma^{SM}_{t \bar{t} t \bar{t}} \sim 1 fb$) and backgrounds in the lepton + jets channel. ...
