“…Within the second study, measurement of Underlying Event (UE) activity accompa- nying top quark pair events is carried out using 13 TeV data. …”
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“…For the search of the new heavy neutral bosons, the decay into two hadronically decaying tau leptons is especially interesting, as in large parts of the search parameter space it has the second largest branching ratio while allowing for a considerably better background rejection than the leading decay into $b$-quark pairs. This search, based on proton-proton collisions recorded at $\sqrt{s} = 13\,\mathrm{TeV}$ in 2015 and early 2016 by the ATLAS experiment at the Large Hadron Collider at CERN, is presented in this thesis. …”
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“…The search is sensitive to resonances produced with quark-antiquark fusion, gluon-gluon fusion, and vector-boson fusion. …”
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“…In nucleus-nucleus collisions, the Quark-Gluon Plasma behaves like a perfect fluid and the azimuthal anisotropy of the observed particle final-state distributions reflects its properties. …”
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“…The azimuthal anisotropies of particle yields observed in relativistic heavy-ion collisions are considered as an evidence of the formation on a deconfined Quark-Gluon Plasma produced in these collisions. …”
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“…The Quark-Gluon Plasma (QGP) is a strongly interacting matter with high temperature and energy density, where partons are deconfined. …”
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“…While theoretical calculations incorporating partonic energy loss in the quark gluon plasma can successfully describe the measured $\mathrm{B\rightarrow{D^0}}$ suppression at higher $p_{\rm{T}}$, the data show an indication of larger suppression than the model predictions in the range of $2 < p_{T} < 5$ ${\rm Ge\hspace{-.08em}V\hspace{-0.16em}}/\hspace{-0.08em}c$.…”
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“…Measurements of the azimuthal anisotropy of charged particles in heavy-ion collisions are sensitive to the detailed properties of the quark-gluon plasma, in particular its dependence on initial conditions, transport coefficients and time evolution. …”
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“…Six groups of observables: (i) lattice QCD data, (ii) hadronic $\tau$ decays, (iii) deep-inelastic $e^\pm p$ data and parton distribution functions (PDF) fits, (iv) event shapes and jet rates in $e^+e^-$ collisions, (v) Z boson hadronic decays, and (vi) top-quark cross sections in pp collisions, are used to extract the current world-average at the Z pole mass, $\alpha_s(m_Z^2) = 0.1181 \pm 0.0011$ at next-to-next-to-leading-order (NNLO), or beyond, accuracy. …”
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“…It will be a general precision instrument for the continued in-depth exploration of nature at the smallest scales, optimised to study with high precision the Z, W, Higgs and top particles, with samples of 5·10^12 Z bosons, 10^8 W pairs, 10^6 Higgs bosons and 10^6 top quark pairs. FCC-ee offers unprecedented sensitivity to signs of new physics, appearing in the form of small deviations from the Standard Model, of forbidden decay processes or of production of new particles with very small couplings. …”
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“…In particular, quantum gravity determines the ratio of Higgs boson mass and top quark mass. In cosmology, approximate scale symmetry explains the almost scale-invariant primordial fluctuation spectrum which is at the origin of all structures in the universe. …”
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“…The neural network output distribution is used as the discriminant in two signal regions while the mass of the hadronically decaying top-quark is used in the third one. This configuration improves the sensitivity to systematic uncertainties affecting the measurement. …”
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“…Measurement of the weak mixing phase phi_s through time-dependent CP violation in Bs0—>J/psi phi decay in ATLAS In the Standard Model of particle physics, CP violation arises due to a single complex phase in the Cabibbo–Kobayashi–Maskawa (CKM) quark mixing matrix. Testing the validity of the CKM mechanism as the only source of CP violation is one of the major experimental challenges in particle physics today. …”
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“…The production and survival of the prompt $\chi_{c1}$(3872) in the quark-gluon plasma is expected to depend upon its internal structure. …”
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“…This talk will present the latest results from the reconstruction jet studies in PHENIX and their implications for energy loss in the quark gluon plasma.…”
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“…--HTML-->The production of low-mass dielectrons is one of the most promising tools for the understanding of chiral symmetry restoration and the thermodynamical properties of the Quark-Gluon plasma (QGP) created in ultra-relativistic heavy-ion collisions. …”
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“…--HTML-->In ultra-relativistic heavy-ion collisions, partons with intermediate energy (5-10) GeV excite ripples as they travel through the Quark-Gluon Plasma (QGP). These ripples' effect on particle production phenomenology is not very well studied. …”
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“…While in Pb-Pb collisions this is done to characterize the quark-gluon plasma, pp and p-Pb collisions serve as a reference and are of interest on their own for their input into the understanding of particle production mechanisms. …”
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“…Furthermore, the presence of the W-boson polarises the initial quark-line and in turn the final tt-pair. This polarisation and asymmetry effects in ttW production can additionally offer a useful handle to constrain new physics. …”
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“…To evaluate autoencoders, a region that is dominated by tt events, with a minor fraction of single top-quark $tW$ events is used. For that region a discriminant called mini-max $m(lb)$ already exists. …”
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