ttˉt\bar{t} + ZZ / WW / ttˉt\bar{t} at ATLAS

The newest results from the ATLAS Collaboration for the production of a top-quark pair in association with a $Z$ or $W$ boson, and for the production of four top quarks, are summarised in these proceedings. The measurements were performed with 36.1 fb$^{-1}$ of proton-proton collision data from the Large Hadron Collider at a centre-of-mass energy of 13 TeV.Comment: 7 pages, 3 figures, TOP2018 Conference Proceeding

T-T-T-That\u27s All, Folks!

The May 1996 Word Ways described the results of a National Public Radio competition of December 1995 in which listeners were challenged to write grammatical and understandable sentences containing the same word four or more times in succession. Some of the most interesting entries were based on repeated thats; this article summarizes them. Four thats is relatively easy, as achieved by the following strategy

CSM analyses of e+e−→ttˉH,ttˉZ,tbˉWe^+e^- \to t\bar t H, t\bar t Z, t\bar b W

We study the modifications of the amplitudes and cross sections of several processes, especially $e^+e^- \to t\bar t H, t\bar t Z, t\bar b W$, generated by Higgs boson and top quark compositeness, in particular within the CSM concept. We illustrate the observable differences that may appear between various, CSM conserving or CSM violating, compositeness possibilities.Comment: 13 pages, 4 figure

Widening the Nexus: From T-R to T-T-R

Higher education institutions are operating with scarce resources in a complex environment, and subject to various, often competing or changing demands. The integration of teaching, research and third stream activities within a coherent academic framework provides an opportunity to manage and exploit the positive relationships between these activities. This approach may also help to ease some of the tensions and 'fault lines' that currently beset academic life

Supersymmetry and TT‾T \overline{T} Deformations

We propose a manifestly supersymmetric generalization of the solvable $T \overline{T}$ deformation of two-dimensional field theories. For theories with $(1,1)$ and $(0,1)$ supersymmetry, the deformation is defined by adding a term to the superspace Lagrangian built from a superfield containing the supercurrent. We prove that the energy levels of the resulting deformed theory are determined exactly in terms of those of the undeformed theory. This supersymmetric deformation extends to higher dimensions, where we conjecture that it might provide a higher-dimensional analogue of $T \overline{T}$, producing supersymmetric Dirac or Dirac-Born-Infeld actions in special cases.Comment: 32 pages; LaTeX; references and an acknowledgement adde

Momentum Distributions in ttˉt\bar t

We apply the Green function formalism for $t-\bar t$ production and decay near threshold in a study of the effects due to the momentum dependent width for such a system. We point out that these effects are likely to be much smaller than expected from the reduction of the available phase space. The Lippmann--Schwinger equation for the QCD chromostatic potential is solved numerically for $S$ partial wave. We compare the results on the total cross section, top quark intrinsic momentum distributions and on the energy spectra of $W$ bosons from top quark decays with those obtained for the constant width.Comment: 12 pages (without figures) (11 (sub)figures available on request), Karlsruhe preprint TTP93-11, hep-ph/yymmnn