“…The trilepton resonance search is used to test models of vector-like leptons and the type~III neutrino seesaw mechanism. The vector-like lepton model is excluded for most of the mass range $114$-$176$ GeV, while the type~III seesaw model is excluded for most the mass range $100$-$468$ GeV. …”
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“…Searches for heavy sterile neutrino $N_4$ and inflaton $\chi$ resonances in $K^\pm\to\pi\mu\mu$ decays are reported. …”
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“…The future beam instrumentation for the Neutrino Platform at CERN is also described here, which is being developed as a continuation of the work conducted during this thesis.…”
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“…Furthermore, studies of the electron capture, of the pair $^{202}$Pb-$^{202}$Tl, are presented, with which it is shown whether they can serve the more precise upper neutrino mass limit determination. The high-precision measured masses along the neutron-rich copper isotopes $^{75-79}$Cu, which reach the neutron shell-closure $N$ = 50, are used with their nucleon structure in comparison to a calculation of a shell model to interpret the behavior of the important waiting point nuclide $^{78}$Ni. …”
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“…The results are important to search for new physics beyond the SM, which can potentially explain unsolved problems such as hierarchy problem, baryon number, dark matter, neutrino mass and so on. ATLAS and CMS experiments at the LHC discovered the Higgs boson in 2012 (Run1). …”
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“…Although many of the experimental observations can be theoretically well explained using the standard model (SM) of particle physics, the SM is not complete because it does not explain gravity, dark matter and dark energy in the universe, matter antimatter asymmetry, nonzero neutrino mass, observed mass of the Higgs boson being much lower than theoretically favored value etc. …”
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“…The second part of the thesis presents a search for charged Higgs bosons decaying to a τ lepton and its neutrino with the ATLAS experiment at the Large Hadron Collider (LHC). …”
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“…</strong> &nbsp; Different interpretations of this excess were explored, ranging from new physics such as solar axions (3.5σ), a neutrino magnetic moment (3.2σ), or bosonic dark matter (3σ local, 4σ global), to detector effects such as tritium (3.2σ) or argon. …”
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“…TI1is state was discovered at BNL by Samios et al. and has since been seen in several neutrino experiments. It was seen at the ISR by Lockman ct al. about a year ago (reported at Budapest) but not in a convincing way. …”
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“…Secondly, it will provide an infrastructure upgradeable to meet the needs of all potential high-power proton users at CERN (EURISOL) and possibly neutrino production facilities. For high-power applications of this nature the SPL will need to provide a 5GeV beam whose time-structure can be tailored to meet the specifications of each application. …”
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“…Both W bosons are required to decay leptonically into a charged lepton and a neutrino. This signature suffers from many sources of background; the most important are continuum electroweak WW production and the production of single W bosons accompanied by a jet misidentified as a lepton (W+jet background). …”
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“…The constraints from $\tau\to3\mu$, $\tau\to\mu\nu\bar{\nu}$, $\mu\to e\gamma$, $g_\mu-2$, neutrino trident production, $Z\to\ell^+\ell^{\prime-}$, semi-leptonic $b\to s\mu^+\mu^-$ decays and $B_s$--$\overline{B}_s$ mixing are examined. …”
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“…This thesis presents two searches for signs of R-parity-violating supersymmetry (SUSY) through decays of the lightest supersymmetric particle (LSP) into two charged leptons and one neutrino. The searches are performed with the ATLAS experiment at the Large Hadron Collider (LHC) using a data set of $pp$ collisions at $\sqrt{s} = 8\TeV$ recorded during the 2012 LHC run, corresponding to an integrated luminosity of $20.3\ifb$. …”
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“…The $\nu_{\mu}$ is not reconstructed, therefore, the $B^0$ momentum needs to be statistically corrected for the missing momentum of the neutrino to compute the correct $B^0$ decay time. A result of $\Delta m_d = 0.503 \pm 0.002 (\textrm{stat.}) …”
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“…Searches for charged Higgs bosons decaying to a tau lepton and a neutrino in fully hadronic final states are presented in this thesis. …”
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“…This constitutes a space for potential new exciting discoveries with future CTA or planned MeV satellite missions, in a combination with already operating neutrino and ultra-high-energy cosmic ray experiments, as it is among such unidentified gamma-ray emitters we may expect to find new classes of extragalactic sources of high-energy emission and particles.…”
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“…In the second analysis, a charged Higgs boson with a mass from 80 GeV to 3 TeV decaying to a tau lepton and a neutrino is searched for in the fully hadronic final state of top quark pair events. …”
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“…The study presented here focuses on $ W^{\prime}$ decays to an electron and a neutrino. The analysis utilises 36.1~fb\textsuperscript{-1} of $\sqrt{s} = 13$~TeV proton-proton ($pp$) collision data recorded using the ATLAS detector over the 2015 and 2016 data taking periods at the Large Hadron Collider at CERN. …”
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“…The Standard Model of particle physics, augmented with neutrino mixing, is at least very nearly the complete theory of interactions of known particles at energies accessible to Nature on Earth. …”
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“…Observation of doubly charged Higgs bosons might provide hints about the mechanism for generating small neutrino masses. The first search uses a data sample corresponding to 36.1 fb$^{-1}$ of integrated luminosity recorded in 2015 and 2016, focusing on the final states with electrons and muons. …”
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