“…This approach provides a high sensitivity to a variety of supersymmetric final states.The focus of this thesis is on a data-driven estimate of the so-called lost-lepton background. In these events, a neutrino is produced and the associated electron or muon is not observed as an isolated lepton or track, and the event enters the search region. …”
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“…Von den möglichen Zerfällen der erzeugten W-Bosonpaare werden nur semileptonische betrachtet, bei denen ein W-Boson hadronisch in ein Quark-Antiquark-Paar zerfällt und das andere in ein geladenes Lepton und ein Neutrino. In der Faltungsmethode werden die aus der Detektorauflösung resultierenden Fehler der einzelnen Ereignisse berücksichtigt. …”
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“…The derived axion luminosity ($L_a\approx 0.16L_{\odot}$) fits the cosmic energy density spectrum and is compatible within 2$\sigma $ with the recent SNO result, showing the important interplay between any exotic energy loss mechanism and neutrino production. At lower energies, using also a ROSAT observation, only $\sim 3\%$ of the X-ray intensity is explained. …”
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“…The neutrino doesn't interact in the detector, but its energy can be measured in the transverse plane as missing transverse momentum. …”
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“…The Cabibbo-Maksymowicz variables, used to describe the kinematics of the decay, were computed under the assumption of a fixed kaon momentum of 60 GeV/c along the z axis, so that the neutrino momentum could be obtained without ambiguity. …”
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“…Three charged leptons and a neutrino from the decay of the final state bosons allow inferences about the scattering process. …”
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“…However, it suffers from several inadequacies~: it can not explain the neutrino masses, it has no candidate for the dark matter and it has no solution for the gauge hierarchy problem, which all require new physics and beyond the Standard Model theories. …”
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“…In addition to the dileptonic decay modes, heavy new resonances can decay into other final states such as pairs of SM $W$ and $Z$ bosons, $VH$ pairs with $V \in \lbrace W, Z \rbrace$ and $H$ as the SM Higgs boson, or pairs of a lepton and a neutrino. Combining searches in various decay channels extends the discovery reach by exploiting their complementarity. …”
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“…These consist of the model's inability to incorporate gravity in its description of the fundamental forces, predict non-zero neutrino masses and account for the existence of Dark Matter. …”
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“…However, it lacks explanations for certain phenomena like neutrino oscillations. Motivated by the search for a complete theory of nature, physicists aim to extend the SM by exploring experimental setups which may provide indications of new physics. …”
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“…In addition, a novel reconstructionof the neutrino four-momentum based on a likelihood is presented, which aims at discriminatingbetween tt + jets in the lepton+jets decay channel and signal events.Furthermore, this thesis presents studies on the impact of dierent pileup mitigationtechniques on top tagging algorithms using simulated events at a center-of-mass energyof 13TeV. …”
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“…In the events of this class one W-Boson decays into a lepton and the associated neutrino, the other W-Boson decays hadronicaly into two jets of particles. …”
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“…This impressive mass needed for neutrino detection is combined with an even more impressive spatial resolution of about a m , characteristic of the nuclear emulsion technique. …”
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“…A measurement of the $\beta$-neutrino angular correlation coefficient $a$ yields information on possible exotic couplings in the weak interaction. …”
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“…Its main shortcomings are the inclusion of gravity as described by general relativity, the existence and properties of dark matter and dark energy and neutrino oscillations. It also fails to explain the different abundances of matter and antimatter that are observed in the Universe. …”
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“…Resonant signals in final states with a charged {(anti-)lepton} (lepton meaning electron or muon) and large missing transverse energy, that is created by the corresponding {(anti-)neutrino}, are probed in the first analysis. The considered signal characteristic is introduced by a variety of new theories, which is the reason why this search is designed with the aim to make no strong model assumptions. …”
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“…Using a combination of results with the $\ell^+\ell^-\nu\bar{\nu}$ analysis channel, where $\nu$ stands for a neutrino, the observed limits on the production cross-section times branching fraction are between 215 fb at 240 GeV and 2.0 fb at 1900 GeV in the ggF production mode, and between 87 fb at 255 GeV and 1.5 fb at 1800 GeV in the VBF production mode. …”
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“…This masterful collection explores captivating subjects such as gravitational waves observed by LIGO, the enigmatic world of neutrino physics in DUNE, and the mysteries lurking beneath the IceCube experiment. …”
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“…The total ZZ production cross section is measured in events where the Z bosons decay to electrons or muons or one of them to neutrino, and is found to be $\sigma^{tot}_{ZZ} = 6.7 \pm 0.7(stat.) ^{+0.4}_{-0.3}(syst.) …”
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“…Trois canaux de désintégration des LQ sont envisagés : en quark top et lepton tau, en quark top et neutrino et enfin en quark top et muon. Cette étude est basée sur l'ensemble des données enregistrées par l’expérience CMS au cours de l'année 2012. …”
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