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-S-T dual black hole

The sequence of intertwined T-S-T duality transformations acting on the 4D static uncharged black hole leads to a new black hole background with horizon and singularity exchanged. It is shown that this space-time is extendible too. In particular we will see that a string moving into a black hole is dual to a string leaving a white hole. That offers the possibility that a test-string does not see the singularity.Comment: Latex, 7pp, 1Fig., epsfig.sty, epsf.tex, (references added

ttˉ{\rm t\bar{t}} cross section measurements in CMS

An overview of the most recent measurements of inclusive top quark pair production cross section is presented. The results are obtained using data collected with the CMS experiment in proton-proton collisions at centre-of-mass energies of 5.02, 7, 8 and 13 TeV. The data are compared with the predictions from perturbative QCD calculations at full NNLO+NNLL accuracy.Comment: 6 pages, 5 figures, TOP2016 conferenc

Counter-(T)error

Traditionally immigrants have been made responsible for a rise in a country’s crime rate, a state’s employment market or a nation’s cultural identity. However, since the events of 9/11 immigrants have evolved into a new kind of security concern. As a result of the terrorist attacks in 2001 by nineteen foreigners, the issue of immigration has become a central aspect in counter-terrorism as nations around the world scrambled to implement policies in reaction to the unprecedented situation. However, one has to question the validity and effectiveness of using immigration measures in the fight against terrorism. Is there an error in current counter-terror policies? The paper will critically discuss whether immigration policies are a useful means of addressing the global threat of terrorism

being [t]here

When you awoke from the dream, in your early thirties, you knew, as you’ve never known anything else in all your seventy-plus years, that what you’d found was real. The dream began with you sitting in a church, head bowed in prayer. Your eyes opened slowly, and you noticed that you were wearing brilliantly colored, beaded moccasins. You stood abruptly, pushed open the mahogany gate that separated the pew from the center aisle of the church, and began to run. The dream then proposed a seemingly endless and entirely quotidian set of difficulties in The City, and led eventually to an arduous climb through a pathless woods, where you passed an unfinished house—framed out but not yet sided—and where (after how many false sightings of the summit?) you squeezed with great difficulty between two tall boulders, and suddenly emerged on the edge of a wondrous canyon. Below you flowed a wide, glistening river, and in the center of the river, partly submerged, sat a throne-like granite armchair. You awoke to the rest of your life with a gasp, exhilarated by the shimmering iridescence of the water in the dream and tantalized by the mystery of the chair. You have looked for that river ever since. [excerpt

Topology of SU(N) gauge theories at T=0 and T=Tc

We calculate the topological charge density of SU(N) lattice gauge fields for values of N up to N=8. Our T=0 topological susceptibility appears to approach a finite non-zero limit at N=infinity that is consistent with earlier extrapolations from smaller values of N. Near the deconfining temperature Tc we are able to investigate separately the confined and deconfined phases, since the transition is quite strongly first order. We find that the topological susceptibility of the confined phase is always very similar to that at T=0. By contrast, in the deconfined phase at larger N there are no topological fluctuations except for rare, isolated and small instantons. This shows that as N->infinity the large-T suppression of large instantons and the large-N suppression of small instantons overlap, even at T=Tc, so as to suppress all topological fluctuations in the deconfined phase. In the confined phase by contrast, the size distribution is much the same at all T, becoming more peaked as N grows, suggesting that D(rho) is proportional to a delta function at N=infinity, centered on rho close to 1/Tc.Comment: 31 page