Top 2016

Session

Young Scientists Forum

20 Sept 2016, 17:30

Main Auditorium EVROPA (NH hotel, Olomouc)

Conveners

Young Scientists Forum

• Jiri Kvita (Palacky University (CZ))
• Roman Lysak (Acad. of Sciences of the Czech Rep. (CZ))

14. Top Signatures From Composite Higgs Theories

Natascia Vignaroli (CP3-Origins)

20/09/2016, 17:30

Young Scientist Forum

Many compelling theories to address the Higgs hierarchy problem predict strong interactions between the top and a sector of New Physics. In minimal composite Higgs models (CHM), the top interactions with a BSM strongly-interacting sector give the main contribution to trigger the EWSB and generate a light mass for the pseudo-NG Higgs. This implies that new composite states (VLQ top-partners,...

37. Search for single production of vector-like quarks decaying into a W-boson and a b-quark at 13 TeV

Dustin Biedermann (Humboldt-Universitaet zu Berlin (DE))

20/09/2016, 17:40

Young Scientist Forum

Search for singly produced vector-like quarks decaying into Wb with one lepton final states is reported using data collected by ATLAS at 13 TeV. The search employs a high-transverse momentum b-tagged jet opposite to the lepton, forward jet originating from the initial-state quark radiating off a W-boson, and no other jet activity in the central region of the detector.

6. Multilepton signatures from tZq interactions in the SM and top-FCNC

Isis Marina Van Parijs (Vrije Universiteit Brussel (BE))

20/09/2016, 17:50

Young Scientist Forum

The associated production of a single top quark and a Z boson (tZq) is a rare process predicted by the standard model (SM). Being sensitive to the top-Z and the trilinear gauge couplings, it constitutes an important probe of the SM. While tZq has a moderate cross section, its yield can be enhanced by flavor changing neutral current (FCNC) interactions. The observation of top-FCNCs, which are...

1. The impact of the photon PDF and electroweak corrections on $t \bar t$ distributions

Ioannis Tsinikos (UCL)

20/09/2016, 18:00

Young Scientist Forum

We discuss the impact of EW corrections on differential distributions in top-quark pair production at the LHC and future hadron colliders, focusing on the effects of initial-state photons. Performing a calculation at Next-to-Leading Order QCD+EW accuracy, we investigate in detail the impact of photon-initiated channels on central values as well as PDF and scale uncertainties, both at order...

8. The search for Standard Model four-top-quark production at sqrt(s) = 13 TeV

Lana Beck (University of Bristol (GB))

20/09/2016, 18:10

Young Scientist Forum

A combined search for standard model four-top-quark production in the single lepton plus jets and dilepton channels will be presented. The analysis utilises the 2015 dataset recorded by the CMS experiment at $\sqrt{s}$ = 13 TeV which corresponds to an integrated luminosity of 2.6 fb$^{-1}$. A scheme based on a boosted decision tree algorithm is used to select signal and suppress backgrounds....

9. Searches for ttbar resonances with the CMS detector at 13 TeV

Marino Missiroli (Universidad Autonoma de Madrid (ES))

20/09/2016, 18:20

Young Scientist Forum

We present the most recent results on searches for new massive resonances decaying to a top-antitop quark pair with the CMS detector at the LHC.
Searches are performed by measuring the invariant mass distribution of the ttbar system, both in semileptonic and fully-hadronic final states, using the data collected by the CMS experiment in pp collisions at sqrt(s)=13 TeV in 2015, the first year of...

19. Measurement of the inclusive ttbar production cross section in ppbar collisions at 1.96 TeV and determination of the top quark pole mass at D0.

Jiri Franc (Czech Technical University (CZ))

20/09/2016, 18:30

Young Scientist Forum

The inclusive cross section of top quark-antiquark pairs produced in $p\bar{p}$ collisions at $\sqrt{s}=1.96$ TeV is measured in lepton$+$jets and dilepton decay channels. The data sample corresponds to 9.7 fb${}^{-1}$ of integrated luminosity recorded with the D0 detector during Run II of the Fermilab Tevatron Collider. Employing multivariate analysis techniques we measure the cross section...

21. Top Quark Mass Calibration for Monte-Carlo Event Generators

Moritz Preisser (University of Vienna)

20/09/2016, 18:40

Young Scientist Forum

The most precise top quark mass measurements use direct reconstruction methods, determining the top mass parameter of a Monte Carlo event generator, m_t^MC. Due to hadronization and parton shower dynamics, relating m_t^MC to a field theory mass is difficult. We present a calibration procedure to determine this relation by exploiting hadron level QCD predictions for observables closely related...

38. Measurement of the t­channel single top­quark and top­antiquark differential cross­sections in pp collisions at √s = 8 TeV with the ATLAS detector

Pienpen Seema (University of Bonn (DE))

20/09/2016, 18:50

Young Scientist Forum

Differential cross­section measurements of t­channel single top­quark production are presented. They use 20.2 fb−1 of data collected by the ATLAS experiment in proton–proton collisions in the LHC at a centre­of­mass energy of 8 TeV. Differential cross­sections as a function of the transverse momentum and rapidity of both the top quark and the top antiquark have been measured at both parton and...

39. Measurements of the charge asymmetry in top­quark pair production in the dilepton final state at √s=8 TeV with the ATLAS detector

Roger Naranjo (Deutsches Elektronen-Synchrotron (DE))

20/09/2016, 19:00

Young Scientist Forum

Measurements of the top–antitop quark pair production charge asymmetry in the dilepton c hannel are presented using data corresponding to an integrated luminosity of 20.3 fb−1 from pp collisions at a center­of­mass energy of √s = 8 TeV collected with the ATLAS detector. Inclusive and differential measurements as a function of the invariant mass, transverse momentum, and longitudinal boost of...

42. Measurements of CP violation asymmetries in B­hadron decays using top quark events collected by the ATLAS detector in pp collisions at 8 TeV

Jacob Julian Kempster (Royal Holloway, University of London)

20/09/2016, 19:10

Young Scientist Forum

Top pair events provide a source of b­bbar pairs, which can be used to probe CP violation in heavy­flavour mixing and decay. In events where one of the W bosons decays leptonically to an electron or muon, the charge of the W boson can be used to determine unambiguously the flavour charge of the accompanying b quark at the time of its production. In cases where the b also decays...