Conveners
Top Quark Physics: Monday morning
- Stephen Wimpenny (University of California - Riverside)
Top Quark Physics: Tuesday morning
- Reinhard Schwienhorst (Michigan State University)
Prof.
Nikolaos Kidonakis
(Kennesaw State University)
31/07/2017, 10:45
Top Quark Physics
Presentation
I present approximate N^3LO theoretical results for top-antitop pair production and for single-top production in association with a W boson. The higher-order corrections are from soft-gluon radiation which is dominant near partonic threshold. I present results for total cross sections as well as transverse-momentum and rapidity distributions of the top quark and compare with data at LHC energies.
Theodor Christian Herwig
(University of Pennsylvania)
31/07/2017, 11:00
Top Quark Physics
Presentation
Physics processes involving top quarks compose a major background for many searches for new physics. Both doubly-resonant "ttbar" and singly-resonant "single top" processes can contribute at similar levels where sophisticated tools are used to effectively reduce ttbar backgrounds. However, because both ttbar and Wt single top with an additional b-quark in the final state can yield an identical...
Daniel Noonan
(Florida Institute of Technology)
31/07/2017, 11:15
Top Quark Physics
Presentation
A measurement of the cross section of top quark pairs produced in association with a photon is presented. The data were collected by the CMS experiment in proton-proton collisions at a center of mass energy of 8 TeV. The measurement is performed in the electron+jets and muon+jets final state. The fiducial cross section for top quark pair plus photon production is measured in the phase space...
58.
Measurement of the $t\bar{t}$ spin correlations and top quark polarization in dileptonic channel
Dr
Ajeeta Khatiwada
(Purdue University)
31/07/2017, 11:30
Top Quark Physics
Presentation
The degree of top polarization and strength of $t\bar{t}$ correlation are dependent on production dynamics, decay mechanism, and choice of the observables. At the LHC, measurement of the top polarization and spin correlations in $t\bar{t}$ production is possible through various observables related to the angular distribution of decay leptons. A measurement of differential distribution provides...
Prof.
Gary Goldstein
(Tufts University)
31/07/2017, 11:45
Top Quark Physics
Presentation
The production of heavy flavor quark pairs, including top-anti-top, at the LHC proceeds primarily through gluon fusion. The correlation between the gluon spins affects various spin correlations between the produced quark and anti-quark. Both single spin asymmetries and double correlations of the quark pair spins will be manifest in the subsequent hadronization and decay distributions. For top...
Collaboration CDF
(Fermilab),
Collaboration D0
(Fermiab),
Ziqing Hong
(Northwestern University)
31/07/2017, 12:00
Top Quark Physics
Presentation
We discuss the complete overview of the forward-backward asymmetry measurements in the angular distributions of pp̄ → tt̄ events at the Tevatron collider. These measurements use the full Run II data set in lepton plus jets and dilepton channels, recorded in the D0 and CDF detectors, corresponding to an integrated luminosity of ≈ 2 × 10 fb −1 . The combinations of inclusive and differential...
Gregorio Bernardi
(LPNHE Paris)
01/08/2017, 10:45
Top Quark Physics
Presentation
We report the most recent measurements of the mass of the the top quark, performed by the D0 experiment at the Fermilab Tevatron collider using the full Run II (2001--2011) data set corresponding to an integrated luminosity of $9.7\ $fb$^{-1}$. This includes measurements in the dilepton channels using the matrix element and neutrino weighting approaches, as well as measurements in the...
Andreas Jung
(Fermilab)
01/08/2017, 11:00
Top Quark Physics
Presentation
We present an alternative approach to the direct measurements of the top quark mass using D0 data. We discuss extractions of the pole mass of the top quark based on measurements of the inclusive and unfolded differential pp̄ → tt̄ production cross section as a function of p T (t) and tt̄ mass.. We use the full Run II data set of pp̄ collisions collected by the D0 experiment, corresponding to...
Prof.
George W.S. Hou
(National Taiwan University)
01/08/2017, 11:15
Top Quark Physics
Presentation
The LHCb experiment uncovered the P5' anomaly, a deviation in data from Standard
Model expectations in the said B -> K*mumu angular observable. This has motivated
a possible Z' boson that couples to left-handed b to s transitions, where a model
would be the gauged L_mu - L_tau symmetry, but direct search for such a Z' is not
promising. Less constrained is a similar Z', but coupling to...
Justin Pilot
(University of California, Davis)
01/08/2017, 11:30
Top Quark Physics
Presentation
We present a novel approach to the problem of discriminating jets produced from the hadronic decays of highly-boosted heavy particles (top, W, Z, H) from light jets. By hypothesizing different particle origins for the jets and boosting all jet constituents into the corresponding rest frames, angular and kinematic distributions of reconstructed particles can be used to discriminate 2- or...
Prof.
Hitoshi Yamamoto
(Tohoku University)
01/08/2017, 11:45
Top Quark Physics
Presentation
This talk will review new developments toward precision top quark
measurements at e+e- colliders, including improvements in the
experimental strategies for top quark pair production in the
continuum, improvements in the precision theoretical understanding of
this process, and sensitivity to new physics models. It will also
update the study of the precision measurement of the t-tbar...